Dynamics of dispersed bubbly flow over a lifting surface: Gas diffusion and bubble breakup effects

OCEAN ENGINEERING

卷:213

Article

Hsiao, Chao-Tsung¹  Chahine, Georges L.¹  Ma, Jingsen¹ 

[1] Dynaflow Inc, 10621-J Iron Bridge Rd, Jessup, MD 20794 USA

关键词: Bubbly flow;    Gas diffusion;    Bubble breakup;    Cavitation;    Eulerian-Lagrangian approach;   

DOI  :  10.1016/j.oceaneng.2020.107630

来源: Elsevier

【 摘 要 】

The modification of the bubble nuclei population by the presence of a finite-span hydrofoil is modeled numerically using an Eulerian-Lagrangian approach. The unsteady liquid flow field is simulated using Navier-Stokes equations, while the bubbles, initiating from nuclei in the free stream and emitted from boundaries, are tracked using a Lagrangian approach. The effects of including gas diffusion, wall nucleation, and bubble breakup on nuclei distribution downstream of hydrofoil are studied. The inclusion of gas diffusion is found to significantly increase the size of the bubbles downstream. Also, inclusion of boundary nucleation is found to significantly increase the total number of large bubbles collected in the wake as compared to accounting for free nuclei alone. Bubble breakup, modeled using instability analysis and experimental observations, is seen to result in a significant increase in the number of small and mid-size bubbles, at the expense of the large size bubbles.

【 授权许可】

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