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ORIGINAL RESEARCH article

Front. Mater., 28 February 2023
Sec. Colloidal Materials and Interfaces
This article is part of the Research Topic Thermodynamics of Newtonian and non-Newtonian Nanofluids with Recent Advancements View all 13 articles

Chemically reactive hybrid nanofluid flow past a Riga plate with nonlinear thermal radiation and a variable heat source/sink

Updated
Ebrahem A. Algehyne,Ebrahem A. Algehyne1,2Showkat Ahmad LoneShowkat Ahmad Lone3Zehba RaizahZehba Raizah4Sayed M. Eldin
Sayed M. Eldin5*Anwar Saeed
Anwar Saeed6*Ahmed M. Galal,Ahmed M. Galal7,8
  • 1Department of Mathematics, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
  • 2Nanotechnology Research Unit (NRU), University of Tabuk, Tabuk, Saudi Arabia
  • 3Department of Basic Sciences, College of Science and Theoretical Studies, Saudi Electronic University, (Jeddah-M), Riyadh, Saudi Arabia
  • 4Department of Mathematics, College of Science, King Khalid University, Abha, Saudi Arabia
  • 5Center of Research, Faculty of Engineering, Future University in Egypt, New Cairo, Egypt
  • 6Center of Excellence in Theoretical and Computational Science (TaCS-CoE), Science Laboratory Building, Faculty of Science, King Mongkut’s University of Technology Thonburi (KMUTT), Bangkok, Thailand
  • 7Department of Mechanical Engineering, College of Engineering in Wadi Alddawasir, Prince Sattam bin Abdulaziz University, Saudi Arabia
  • 8Production Engineering and Mechanical Design Department, Faculty of Engineering, Mansoura University, Mansoura, Egypt

The suspension of nanoparticles in base liquids has found extensive applications in various industrial processes like nanomedicines, microsystem cooling, and energy conversion. Owing to its important applications, this article investigates the hybrid nanofluid flow over a three-dimensional stretching surface. The fluid is influenced by thermal radiation, chemical reaction, and a variable thermal source/sink. The set of equations that administer the fluid behavior has been transformed to dimensionless form by a suitable set of similarity transformations that are further solved by the homotopy analysis method. It was found that as the ratio parameter increased, the velocity of hybrid nanofluid velocity decreased along the primary direction and increased along the secondary direction. The temperature characteristic was augmented with greater values of nonlinear thermal radiation and source/sink factors. Growth in the chemically reactive factor and Schmidt number has an adverse effect on the concentration profile of the hybrid nanofluid flow. A comparative analysis of the current results and those established in the literature was conducted. A close agreement with those published results was found. It was noted that temperature and concentration increase more quickly for the MoS2+MgO/H2O hybrid nanofluid than the MoS2/H2O,MgO/H2O nanofluids.

1 Introduction

The heating and cooling of fluids is quite useful in industrial applications like power manufacturing and power transportation processes. Typical fluids have lower thermal conductivities because of their lower thermal flow characteristics. In contrast, the thermal conductivity of metals is higher. So, to create fluids with a desired level of thermal conductivity, solid nanoparticles are mixed with conventional fluids, as proposed by Choi (Choi and Eastman, 1995). Shah et al. (2020) mixed gold nanoparticles in blood, discussed the behavior of that fluid, and concluded that the thermal characteristics were enhanced with improvements in the radiation factor and number of solid nanoparticles. Bhatti et al. (2022) studied the swimming behavior of microorganisms in a Williamson MHD nanofluid flow over rotating plates embedded in a permeable region and concluded that an increase in magnetic factor and nanoparticle volume fraction increased the temperature characteristics and decreased fluid velocity. Acharya et al. (2022) inspected the variations in hydrothermal nanofluid flow influenced by the diameters of nanoparticles and a nanolayer and showed that the nanolayer enhanced the thermal flow by 84.61%. Shahid et al. (2022) presented a numerical examination of nanofluid flow over a permeable surface using the influences of activation energy and bioconvection.

Mixing two different types of nanoparticles in a base fluid will enhance its thermal conductivities. This is called a hybrid nanofluid. Manzoor et al. (2021) studied the improvement of thermal transmission of a magnetized hybrid nanofluid flow over a stretching sheet and concluded that the temperature distributions were augmented with enhancements in volume fractions and magnetic factors. Khan et al. (2022a) examined the flow of a hybrid nanoliquid on a moving heated needle placed horizontally in the fluid and found that the thermal transmission was enlarged with an increase in Brownian motion, Eckert number, and volume fractions of nanoparticles. Waseem et al. (2021) examined the couple stress hybrid nanofluid flow over a vertically placed heated plate using heterogeneous and homogeneous reactions. They concluded that the skin friction increased with the increase in buoyance forces. Eid and Nafe (2022) examined the thermal conductivity and heat generation influences on MHD hybrid nanoliquid flow over a stretching surface with slip conditions. Zhang et al. (2022) analyzed the flow of hybrid nanoliquid past a stretching surface and concluded that the fluid moved faster with higher values of the Darcy number, while the motion of fluid was retarded with an increase in the magnetic factor. Ojjela (2022) investigated the thermal transportation of hybrid nanofluid using alumina and silica nanoparticles and compared the results with established studies. The related analyses can be seen in Zabihi et al. (2020a), Zabihi et al. (2020b), Wahid et al. (2020), Alhowaity et al. (2022), Khan et al. (2022b), and Zabihi et al. (2022).

Fluids that conduct electrically, like liquid metals, plasmas, and electrolytes, can be organized using magnetic fields. These flows have many applications in earthquakes, astrophysics, geophysics, and sensors. In such phenomena, magnetic and electric fields are used to control and direct the flow of fluids; these are called EMHD flow. Fluids flowing in electrically weak conducted fluids can be organized and controlled by applying an external electric field using a Riga plate, which is an electromagnetic surface with alternatively assembled electrodes. Such an arrangement produces hydrodynamic and electromagnetic behavior within the fluid flow on a surface. Lielausis (1961) constructed a Riga plate to control the fluid flow by producing a Lorentz effect along a wall. Shafiq et al. (2021) studied double stratification at the stagnant point in a Walters-B nanofluid past a radiative Riga plate. They observed that intensive retardation in thermal flow and concentration was found for double stratification, while stronger radiation values corresponded to a significant rise in temperature. Asogwa et al. (2022) compared two different nanofluid characteristics regarding the thermal, skin friction, and concentration past an exponentially accelerated Riga plate. They found that in the case of increased radiation, a CuO-based nanofluid behaved much better than a Al2O3-based nanofluid. Gangadhar et al. (2021) investigated the flow of a radiative EMHD fluid on a Riga plate due to heat convection using the modified Buongiorno model. Rahman et al. (2022) examined the effects of suction and magnetic factors on a nanofluid flow containing copper oxide, metal, alumina, and titanium dioxide nanoparticles over a spinning disc. Anuar et al. (2020) analyzed the magnetohydrodynamic effect on a nanofluid flow over a nonlinear extending surface. Kumar et al. (2017) investigated the influence of chemical reactions on the MHD three-dimensional nanofluid flow over a Riga plate.

Thermal radiation plays a fundamental role in the heat transport phenomenon. Many investigations have been made on the nanofluid flow with thermal radiation effects. Hayat et al. (2013) investigated the Jeffery liquid flow past a stretching sheet with the impact of thermal radiation and found that the skin friction and Sherwood number were amplified due to the higher radiation factor. Sabir et al. (2021) examined the Sutterby fluid flow with the influence of thermal radiation and concluded that higher strength of magnetic and radiation factors augmented the thermal characteristic and skin friction. Ijaz et al. (2021) simulated the effects of a thermal radiation magnetic field on a nanofluid flow containing gyrotactic microorganisms and concluded that the temperature- and space-based heat absorptions were more appropriate for cooling. Ali et al. (2021) inspected the influences of thermal radiation and magnetic field effects on the Darcy flow and observed that with an increase in the diameter of copper nanoparticles, the temperature distribution was increased. Saeed et al. (2021) investigated the Darcy–Forchheimer nanoliquid flow with thermal radiation and determined that the velocity profile reduced with the higher Darcy number, and temperature was increased with growth in the radiation factor. The impacts of thermal radiation, chemical reaction, and heat absorption/generation on MHD Maxwell nanofluid flow were examined by Tlili et al. (2020).

In many investigations, there may be reasonable thermal differences between the ambient fluid and the surface on which the fluid flows. This idea necessitates deliberation in the presence of thermal heat or a thermal sink that strongly affects the thermal flow rate of a fluid flow system. This idea is gaining more attention because of its expanding uses in production engineering problems where the heat transportation is substantial to enhance the quality of the final product. Khader and Sharma (2021) evaluated the time-based MHD liquid flow over a shrinking/stretching sheet using thermal radiation and a heat source and found that temperature declined with an expansion in the steadiness factor and the thermal buoyancy parameter, whereas it increased with higher values of the heat source. Tarakaramu et al. (2022) discussed the three-dimensional couple stress fluid flow past a stretching surface with nonlinear thermal radiation and heat source impacts. Ram et al. (2022) examined the mixed convection thermal and mass transportations in a magnetized fluid flow at a stagnant point of a stretching surface with a heat source. Haq et al. (2022) examined the mixed convective nanofluid flow past an irregular inclined sheet with a chemical reaction and heat source impact and found that velocity rises with the increases in the angle of inclination. Sharma et al. (2022) explored the effect of a thermal source on EMHD nanofluid flow over an extending surface. Saleh et al. (2022) analyzed the influence of the heat source on nanoliquid flow past a stretching surface and found that thermal distribution increased as the temperature-based heat source and space factors increased. Li et al. (2022) discussed the double diffusion nanofluid flow with the influence of activation energy, a nonlinear heat source/sink, and convective conditions. Many similar studies can be seen in Alharbi et al. (2018), Alwawi et al. (2020), Hamarsheh et al. (2020), Sravanthi (2020), El-Zahar et al. (2021), Khan et al. (2021), Shamshuddin et al. (2021), El-Zahar et al. (2022), Thumma et al. (2022), Ullah et al. (2022), and Waini et al. (2022).

Apart from the aforementioned analyses, there is less work on the hybrid nanoliquid flow over a stretching surface. The surface of the plate is kept at a constant temperature and concentration. The nonlinear thermal radiation, variable heat source/sink, thermophoresis, Brownian motion, and chemical reaction impacts are considered to make this model novel. The mathematical formulation of the flow is presented in Section 2. Section 3 provides a semi-analytical solution to the flow problem. The validation of current results with published results is presented in Section 4. The discussion of the present results is presented in Section 5. Concluding remarks are presented in Section 6.

2 Problem formulation

Consider the flow of a hybrid nanofluid on a three-dimensional extending surface. The surface stretches along the x axis with a velocity uwx=ax and along the y axis with velocity vwy=by, where a and b are positive fixed values. The flow in the system is induced by a Riga plate with M=M0x along the z direction. At the surface of the Riga plate, Tw is temperature and Cw is concentration, whereas, at the free surface, these quantities are given as T and C. Nonlinear thermal radiation, the variable heat source/sink, thermophoresis, and chemical reaction effects are also considered. Using these assumptions, the leading equations can be written as follows (Ahmad et al., 2016; Muhammad et al., 2021; Alqarni, 2022; Shah et al., 2022):

ux+vy+wz=0,(1)
uux+vuy+wuz=μhnfρhnf2uz2+1ρhnfπj0M8expπα0z,(2)
uvx+vvy+wvz=μhnfρhnf2vz2,(3)
uTx+vTy+wTz=khnfρCphnf2Tz21ρCphnfqrz+1ρCphnfq,(4)
uCx+vCy+wCz=DB2Cz2K*CC,(5)

with boundary conditions:

u=uwx=ax,v=vwy=by,T=Tw,C=Cwatz=0u0,v0,TT,CCasz(6)

As mentioned previously, u,v,andw are the velocity components along the coordinate axes, M is the magnetic property of the plate surface due to the permanent magnet, and j0 is the electrode current density.

The qr (radiative heat flux) is defined as follows (Alqarni, 2022):

qr=4σ*3k*T4z=16σ*3k*zT3Tz.(7)

The variable heat source/sink term q is defined as follows (Khan et al., 2022c; Rawia et al., 2022):

q=uwxkhnfνhnfxSpTwTf+HsTT.(8)

In the aforementioned equation, Sp is the space factor and Hs is the heat sink/source factor.

Substituting Eqs 7, 8 in Eq. 4, we have

uTx+wTz+vTy=1ρCphnfkhnf2Tz2+16σ*3k*zT3Tz+1ρCphnfuwxkhnfνhnfxSpTwTf+HsTT.(9)

The thermophoresis models for a nanofluid and hybrid nanofluid are appended as follows (Acharya et al., 2020), while their numerical values are assumed in Table 1.

μnfμf=11ϕ2.5,ρnfρf=1ϕ+ϕρsρf,ρCpnfρCpf=1ϕ+ϕρCpsρCpf,knfkf=ks+2kf2ϕkfksks+2kf+ϕkfks,σnfσf=1+3σsσf1ϕ2+σsσf+1σsσfϕ.(10)
σhnfσf=1+3ϕ1σs1+ϕ2σs2σf3ϕ1+ϕ22+ϕ1σs1+ϕ2σs2ϕ1+ϕ2σfϕ1σs1+ϕ2σs2σfϕ1+ϕ2,μhnfμf=11ϕ1ϕ22.5,ρhnfρf=1ϕ1ϕ2+ϕ1ρs1ρf+ϕ2ρs2ρf,ρCphnfρCpf=1ϕ1ϕ2+ϕ1ρCps1ρf+ϕ2ρCps2ρf,khnfkf=ks1ϕ1+ks2ϕ2ϕ1+ϕ2+2kf+2ks1ϕ1+ks2ϕ22ϕ1+ϕ2kfks1ϕ1+ks2ϕ2ϕ1+ϕ2+2kf2ks1ϕ1+ks2ϕ2+ϕ1+ϕ2kf.(11)

TABLE 1
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TABLE 1. Thermophysical characteristics of base fluid and nanoparticles (Mishra and Upreti, 2022).

The similarity variables are given as follows:

u=axfξ,v=aygξ,w=aνfgξ+fξ,φξ=CCCwC,θξ=TTTwT,ξ=zaνf.(12)

Employing Eq. 12, the governing equations are reduced as follows:

μhnf/μfρhnf/ρffξ+gξ+fξfξfξ2+Hρhnf/ρfexpξα=0,(13)
μhnf/μfρhnf/ρfgξgξ2+gξ+fξgξ=0,(14)
khnf/kfρCphnf/ρCpf+NρCphnf/ρCpf1+θw1θξθξ3θξ+Prfξ+gξθξ+khnf/kfρhnf/ρfρCphnf/ρCpfμhnf/μfSpfξ+Hsθξ=0,(15)
1Scφξ+fξ+gξφξγφξ=0,(16)

with boundary conditions

fξ=0=0,fξ=0=1,fξ=0,gξ=0=0,gξ=0=S,gξ=0,θξ=0=1,θξ=0,φξ=0=1,φξ=0.(17)

In the aforementioned equations, α=πα0νfa is the EMHD material parameter, H=μj0M08a2ρf is the modified Hartmann number, S=ba is the ratio parameter, Sc=νfDB is the Schmidt number, Pr=ρCpfνfkf is the Prandtl number, N=16σ*T33k*kf is the thermal radiation factor, θw=TwT is the temperature ratio factor, and γ=K*a is the chemical reaction factor.

2.1 Quantities of interest

The main engineering quantities of interest, skin friction (Cfx; Cfy), Nusselt number (Nux), and Sherwood number (Shx), are specified as follows:

Cfx=τwxρfuwx2,Cfy=τwyρfvwy2,Nux=xqwkfTwT,Shx=xqmDBCwC,(18)

such that

τwx=μhnfuzz=0,τwy=μhnfvzz=0,qw=khnfTzz=0+qrz=0,qm=DBCzz=0.(19)

Using Eq. 12, we have

RexCfx=μhnfμff0,ReyCfy=μhnfμfg0,NuxRex=khnfkf+N1+θw1θ03θ0,ShxRex=φ0.(20)

where Rex=uwxxνf and Rey=vwyyνf are the local Reynolds numbers.

3 Method of solution

To solve Eqs 1316 with Eq. 17, we use the homotopy analysis approach (HAM) presented by Liao (1999) and Liao (2010). It is a semi-analytical approach used to find the solution of extremely nonlinear differential equations in the form of series solutions. It is a fast convergent approach for the solution of fluid problems. The initial guesses for this approach are given as follows:

f0ξ=1Expξ,g0ξ=S1Expξ,θ0ξ=Expξ,φ0ξ=Expξ.(21)

The linear operators are specified as follows:

Lfξ=3fξ3fξ,Lgξ=3gξ3gξ,Lθξ=2θξ2θ,Lφξ=2φξ2φ,(22)

with properties

Lfζ1+ζ2Expξ+ζ3Expξ=0,Lgζ4+ζ5Expξ+ζ6Expξ=0,Lθζ7Expξ+ζ8Expξ=0,Lφζ9Expξ+ζ10Expξ=0,(23)

where ζ1ζ10 are the constants in general solution.

These are zeroth-order problems:

1ΗLffξ;Ηf0ξ=ΗNffξ;Η,gξ;Η,(24)
1ΗLggξ;Ηg0ξ=ΗNggξ;Η,fξ;Η,(25)
1ΗLθθξ;Ηθ0ξ=ΗNθθξ;Η,fξ;Η,gξ;Η,(26)
1ΗLφφξ;Ηφ0ξ=ΗNφφξ;Η,fξ;Η,gξ;Η,(27)
f0;Η=0,f0;Η=1,f;Η=0,g0;Η=0,g0;Η=S,g;Η=0,θ0;Η=1,θ;Η=0,φ0;Η=1,φ;Η=0,(28)

where Η01 is the embedding parameter and is the non-zero auxiliary factor. The nonlinear operators can be written as follows:

Nffξ;Η,gξ;Η=μhnf/μfρhnf/ρf3fξ;Ηξ3+gξ;Η+fξ;Η2fξ;Ηξ2fξ;Ηξ2+Hρhnf/ρfexpξα,(29)
Nggξ;Η,fξ;Η=μhnf/μfρhnf/ρf3gξ;Ηξ3gξ;Ηξ2+gξ;Η+fξ;Η2gξ;Ηξ2,(30)
Nθθξ;Η,fξ;Η,gξ;Η=khnf/kfρCphnf/ρCpf+NρCphnf/ρCpf1+θw1θξ;Ηθξ;Η32θξ;Ηξ2+Prfξ;Η+gξ;Ηθξ;Ηξ+khnf/kfρhnf/ρfρCphnf/ρCpfμhnf/μfSpfξ;Ηξ+Hsθξ;Η,(31)
Nφφξ;Η,fξ;Η,gξ;Η=1Sc2φξ;Ηξ2+fξ;Η+gξ;Ηφξ;Ηξγφξ;Η.(32)

For Η=0 and Η=1, we have

fξ;0=f0ξ,fξ;1=fξ,gξ;0=g0ξ,gξ;1=gξ,θξ;0=θ0ξ,θξ;1=θξ,φξ;0=φ0ξ,φξ;1=φξ.(33)

Using a Taylor series expansion with respect to Η, we have

fξ;Η=f0ξ+m=1fmξΗm,fmξ=1m!mfξ;Ηξmgξ;Η=g0ξ+m=1gmξΗm,gmξ=1m!mgξ;Ηξmθξ;Η=θ0ξ+m=1θmξΗm,θmξ=1m!mθξ;Ηξmφξ;Η=φ0ξ+m=1φmξΗm,φmξ=1m!mφξ;Ηξm.(34)

These are mth-order deformation problems:

Lffmξχmfm1ξ=Rmfξ,(35)
Lggmξχmgm1ξ=Rmgξ,(36)
Lθθmξχmθm1ξ=Rmθξ,(37)
Lφφmξχmφm1ξ=Rmφξ,(38)
fm0=fm0=fm=0gm0=gm0=gm=0θm0=θm=0φm0=φm=0,(39)
Rmfξ=μhnf/μfρhnf/ρffm1+n=0m1gm1nfm+n=0m1fm1nfm(fm1)2+Hρhnf/ρfexpξα,(40)
Rmgξ=μhnf/μfρhnf/ρfgm1(gm1)2+n=0m1gm1ngm+n=0m1fm1ngm,(41)
Rmθξ=khnf/kfρCphnf/ρCpf+NρCphnf/ρCpf1+θw1θm1θm13θm1+n=0m1fm1nθm+n=0m1gm1nθm+khnf/kfρhnf/ρfρCphnf/ρCpfμhnf/μfSpfm1+Hsθm1,(42)
Rmφξ=1Scφm1+n=0m1gm1nφm+n=0m1fm1nφmγφm1,(43)

where

χm=0,m11,m>1.(44)

3.1 HAM convergence

HAM ensures the convergence of our series solution of the modeled equations. The auxiliary factor plays a key role in adjusting and controlling the convergence region of the flow problem. To examine the convergence of our present model, we have plotted Figure 1. The convergence region of f0 is 2.0f0.0, g0 is 1.0g0.0, θ0 is 2.3θ0.3, and φ0 is 2.5φ0.5.

FIGURE 1
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FIGURE 1. curves for f0, g0, θ0, and φ0.

4 Validation

A comparative analysis was carried out, as shown in in Table 2, between the current results and the results given in Kumar et al. (2017), Anuar et al. (2020), and Shah et al. (2022). The current results have a close relationship with results previously published in the literature.

TABLE 2
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TABLE 2. Comparative analysis of common factors among current and previous results for ϕ1=ϕ2=0.

5 Results and discussion

This article investigates the EMHD flow of a hybrid nanofluid past a bi-directional extending surface. The fluid is influenced by nonlinear thermal radiation, chemical reactions, and a variable heat source. The set of equations that administered the fluid behavior has been transformed to dimensionless form by applying appropriate similarity variables. The impacts of various substantial parameters on the flow profiles are discussed in the following paragraphs.

Figure 2 depicts the influences of the Hartmann number on fluid velocity. It is observed that the higher values of H increase the velocity profile. The higher H intensity of the electric field enhances the parallel Lorentz force, and, as a result, the velocity of the hybrid nanofluid flow enhances. This shows that along the x-direction, the velocity gets support from the parallel Lorentz force. Therefore, the velocity profile of the hybrid nanofluid flow enhances with the greater H.

FIGURE 2
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FIGURE 2. Impact of H on fξ.

Figures 3, 4 show the impact of S on fξ and gξ. It is observed that S is a retarding function of fξ and an augmenting function of gξ. Physically, the increasing values of S support the skin friction at the surface of the Riga plate by extending more friction to the fluid motion in its opposite direction at the surface. The reason for this is that the ratio parameter S is in a direct relationship with the fluid velocity in the y-direction and in a reverse relationship in the x-direction. Hence, a retarding impact was noted in fξ, and an augmenting effect was observed in gξ.

FIGURE 3
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FIGURE 3. Impact of S on fξ.

FIGURE 4
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FIGURE 4. Impact of S on gξ.

The behavior of temperature flow due to the increase in the nonlinear thermal radiation factor N is depicted in Figure 5. We see that with the increase in N, the thermal profile increases. With growing values of N, maximum thermal diffusions occur at the surface of the Riga plate due to the electrical and magnetic characteristics at the surface. Hence, an increase in N results in an expansion in the thermal distribution, as depicted in Figure 5.

FIGURE 5
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FIGURE 5. Impact of N on θξ.

The influence of the space factor Sp and the heat source/sink factor HS on temperature distribution is depicted in Figures 6, 7. Note that for the positive values of Sp and HS, both behave as a heat generation source. Furthermore, the presence of a heat source factor discharges the energy to the fluid flow system. This released energy augments the temperature boundary layer, and consequently, the temperature distribution increases.

FIGURE 6
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FIGURE 6. Impact of Sp on θξ.

FIGURE 7
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FIGURE 7. Impact of HS on θξ.

The effect of the chemical reactant factor γ on the concentration profile is shown in Figure 8. The higher chemical reaction factor reduces the concentration profile of the hybrid nanofluid flow.

FIGURE 8
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FIGURE 8. Impact of γ on φξ.

The behavior of concentration characteristic in response to the variation in Schmidt number Sc is shown in Figure 9, which shows that the concentration profile reduces with the higher values of Sc. Note that Sc has an adverse impact upon the concentration characteristics. Physically, with higher values of Sc, the mass diffusivity reduces, while the kinetic viscosity of fluid enhances, causing the declination in the mass profile. The fluid particles at the surface of the Riga plate with greater values of Sc defuse less, due to which less mass transmission occurs. As a result, the concentration characteristic diminishes gradually, as portrayed in Figure 9.

FIGURE 9
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FIGURE 9. Impact of Sc on φξ.

Figures 10, 11 depict the behavior of velocity profiles of the MgOH2O nanofluid, the MoS2H2O nanofluid, and the MoS2MgO/H2O hybrid nanofluid. In the case of the MgOH2O and MoS2H2O nanofluids, there are the same variations in velocity characteristics at the surface of the Riga plate. However, in the case of the MoS2MgO/H2O hybrid nanofluid, the behavior is different. Fluid motion is higher for the MoS2MgO/H2O hybrid nanofluid flow than the MoS2H2O and MgOH2O nanofluid flows, as depicted in Figures 10, 11.

FIGURE 10
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FIGURE 10. Velocity profile (fξ) for the comparison of MoS2MgO/H2O, MoS2H2O, and MgOH2O.

FIGURE 11
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FIGURE 11. Velocity profile (gξ) for the comparison of MoS2MgO/H2O, MoS2H2O, and MgOH2O.

Similarly, from Figures 12, 13, we see that the behavior of temperature and concentration profiles for the MgOH2O, MoS2H2O,and MoS2MgO/H2O hybrid nanofluids are quite different. For the MgOH2O and the MoS2H2O nanofluids, there are some variations in temperature and concentration characteristics at the surface of the Riga plate. However, in the case of the MoS2MgO/H2O hybrid nanofluid flow, more heat transfer is offered to flow particles. Hence, the temperature is increased more in the case of the MoS2MgO/H2O hybrid nanofluid flow, as depicted in Figure 12. The reason is that the hybrid nanofluid flow has greater thermal conductivity than the two other nanofluids. Similarly, the concentration boundary layer thickness is largest in the case of the MoS2MgO/H2O hybrid nanofluid flow when compared to the MgOH2O and MoS2H2O nanofluids. Hence, the concentration profile is higher in the case of the MoS2MgO/H2O hybrid nanofluid flow. The reason is that the hybrid nanofluid flow has more mass transfer rate than the other two nanofluids, as shown in Figure 13.

FIGURE 12
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FIGURE 12. Temperature profile (θξ) for the comparison of MoS2MgO/H2O, MoS2H2O, and MgOH2O.

FIGURE 13
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FIGURE 13. Concentration profile (φξ) for the comparison of MoS2MgO/H2O, MoS2H2O, and MgOH2O.

Table 1 portrays the numerical values of different thermophysical characteristics. Table 3 depicts the influences of nonlinear thermal radiation N, space factor Sp, and a heat source/sink factor HS on the Nusselt number in the case of the MgOH2O nanofluid, the MoS2H2O nanofluid, and the MgOMoS2/H2O hybrid nanofluid. With growing values of N, the maximum thermal diffusions occur at the surface of the Riga plate due to the electric and magnetic characteristics at the surface. Hence, amplification in the values of N results in an increase in the Nusselt number. Similarly, an increase in the space factor Sp and heat source/sink factor HS causes an increase in the Nusselt number. Growth in the Nusselt number in the case of the MgOMoS2/H2O hybrid nanofluid is greater than in the MgOH2O and MoS2H2O nanofluids. In Table 4, the impacts of the chemical reactant factor γ and the Schmidt number Sc are shown on the Sherwood number. With the increase in γ, the solutal molecules grow and cause mass diffusions. Hence, growth in γ causes a decline in the values of the Sherwood number. Similarly, with higher values of Sc, less mass transmission occurs; as a result, the Sherwood number decreases gradually.

TABLE 3
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TABLE 3. Impacts of different physical factors on the Nusselt number.

TABLE 4
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TABLE 4. Influence of γ and Sc on the Sherwood number.

6 Conclusion

This work investigates hybrid nanofluid flow past a bi-directional stretching surface. The hybrid nanofluid flow is affected by thermal radiation, chemical reactions, and a variable thermal source/sink. The set of equations that administer the hybrid nanofluid flow behavior was transformed to a dimensionless form by suitable similarity transformations. After a comprehensive analysis, the following points are noted.

a) Because the increase in the Hartmann number augments the strength of the electrical field externally, the behavior of the wall Lorentz force increases the decrease in the velocity of the fluid.

b) The ratio parameter has a direct relationship with the hybrid nanofluid flow velocity in the y-direction and a reverse relationship in the x-direction. Hence, a retarding impact was noted on the primary velocity, and an augmenting effect was observed on the secondary velocity.

c) With growing values of the nonlinear thermal radiation factor, the maximum thermal diffusions occur at the surface of the Riga plate. Hence, augmentation of the radiation factor results in an increase in the thermal distribution.

d) The space factor and heat source/sink factor behave as a heat generator and a heat absorption point, respectively, in the flow system; hence, an increase in these factors increases the temperature of hybrid nanofluid flow.

e) Increases in the chemical reaction factor and the Schmidt number have an opposing effect on the concentration distribution of the hybrid nanofluid flow.

f) Temperature and concentration increase more rapidly for the hybrid nanofluid than the other two nanofluids.

Data availability statement

The original contributions presented in the study are included in the article/Supplementary Material; further inquiries can be directed to the corresponding authors.

Author contributions

EA and SL: conceptualization, methodology, software, reviewing and editing. ZR: data curation and writing—original draft preparation. SE: visualization and investigation. AS: software, validation, and supervision. AG: writing—reviewing and editing.

Acknowledgments

The author (ZR) extends her appreciation to the Deanship of Scientific Research at King Khalid University, Abha, Saudi Arabia, for funding this work through the Research Group Project under Grant Number (RGP.1/334/43).

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher’s note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors, and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

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Nomenclature

Tw surface temperature

uw stretching velocity

M magnetic factor

qr radiative heat flux

q variable heat source/sink

SpandHs space and heat factors

k* Stefan–Boltzmann constant

Sc Schmidt number

N nonlinear thermal radiation

γ chemical reaction

Cp specific heat

MgO magnesium oxide

MoS2 molybdenum disulfide

(Cfx; Cfy) skin frictions

νf kinematic viscosity

θξ temperature profile

Cw surface concentration

EIJ rate of deformation

j0 electrode current density

ρ density

σ* mean absorption coefficient

α EMHD factor

H modified Hartmann number

S ratio parameter

Pr Prandtl number

θw temperature ratio parameter

k thermal diffusivity

H2O water

Nux Nusselt number

Shx Sherwood number

Re Reynold number

fζ velocity profile

Keywords: nanofluid, hybrid nanofluid, Riga plate, thermal radiation, chemical reaction, variable heat source

Citation: Algehyne EA, Lone SA, Raizah Z, Eldin SM, Saeed A and Galal AM (2023) Chemically reactive hybrid nanofluid flow past a Riga plate with nonlinear thermal radiation and a variable heat source/sink. Front. Mater. 10:1132468. doi: 10.3389/fmats.2023.1132468

Received: 27 December 2022; Accepted: 06 February 2023;
Published: 28 February 2023.

Edited by:

Hammad Khalil, University of Education Lahore, Pakistan

Reviewed by:

Ali Zabihi, Rowan University, United States
Aurang Zaib, Federal Urdu University of Arts, Sciences and Technology Islamabad, Pakistan
Mustafa Turkyilmazoglu, Hacettepe University, Türkiye
A. M. Rashad, Aswan University, Egypt

Copyright © 2023 Algehyne, Lone, Raizah, Eldin, Saeed and Galal. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Sayed M. Eldin, sayed.eldin22@fue.edu.eg; Anwar Saeed, anwarsaeed769@gmail.com

Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.