Abstract
The bubble drag force correlation plays an important role in the numerical simulation accuracy of gas/liquid flows. In order to systematically investigate the interphase drag force of non-buoyancy driven bubbly flows, a dynamic-positioning body force (DPBF) method is developed in this study. It is proved that this method has an enough computation precision. Using this method, a series of direct numerical simulation (DNS) cases of a single bubble with low-intermediate Re(1 ≤ Re ≤ 200) and a bubble swarm with low Re(5.6 ≤ Re ≤45) are carried out and the bubble drag coefficients are calculated. Based on all the DNS data, the drag correlations with dimensionless parameters (Re, We for a single bubble and Re, We, gas fraction for bubble swarm) are systematically investigated and reported in this paper, which can provide a reference to the development of drag force closure model for non-buoyancy driven bubbly flows.
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Project supported by the State Key Program of National Natural Science of China (Grant No. 91852204), the National Natural Science Foundation of China (Grant No. 11772298).
Biography: Ling-xin Zhang (1978-), Male, Ph. D., Associate Professor
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Zhang, Lx., Zhou, Zc. & Shao, Xm. Numerical investigation on the drag force of a single bubble and bubble swarm. J Hydrodyn 32, 1043–1049 (2020). https://doi.org/10.1007/s42241-020-0085-2
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DOI: https://doi.org/10.1007/s42241-020-0085-2