AUTHOR=Liu Xiaoguang , Wang Jiasheng , Chai Zhaohui , Min Fengyang , Jiang Xi , Zhu Kongxian , Dai Juan 

TITLE=New model for predicting terminal settling velocity and drag coefficient of the Oncomelania

JOURNAL=Frontiers in Environmental Science

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/environmental-science/articles/10.3389/fenvs.2022.1051392

DOI=10.3389/fenvs.2022.1051392

ISSN=2296-665X

ABSTRACT=<p>This paper presents a study of the terminal settling velocity and drag coefficient of the <italic>Oncomelanias</italic> with highly irregular shape in the range of particle Reynolds number (10 &lt; <italic>R</italic><sub>ep</sub> &lt; 600). The movement characteristics of the <italic>Oncomelanias</italic> with horizontal and slant postures are revealed using image analysis and wavelet analysis. The shape features of <italic>Oncomelanias</italic> with different dimensions are quantified and formulated. The authors propose a new model for predicting the drag coefficient of the dormant and active <italic>Oncomelanias</italic>, which is proven to be better than several widely-used formulas. Further, a simple settling velocity model that can predict the terminal velocity of the <italic>Oncomelanias</italic> fairly with several easy-to-measure parameters is developed. These findings provide a basis for the further improvement for the hydraulic schistosomiasis control project and supply reference for the settling characteristics and drag coefficient of cone-shaped particles.</p>