Direct numerical simulation of gas-liquid mass transfer around a spherical contaminated bubble in the stagnant-cap regime
نویسندگان
چکیده
Direct Numerical Simulations are performed to investigate the gas-liquid mass transfer around a rising spherical bubble contaminated by insoluble surfactants. The surfactant transport on surface and Marangoni effect taken into account when solving hydrodynamics, resulting in stagnant-cap condition. A parametric study is carried out varying Reynolds, Schmidt numbers. thorough analysis of impact surfactants hydrodynamics presented through correlation for maximum velocity umax* along interface as function contamination angle ?cap. These two parameters then found be crucial quantify rate interface. latter analyzed Sherwood number, which decreases partially immobilized, between value clean solid sphere. local flux out, shows that boundary layer thickens immobilized zone interface, mobile also lower than at same Re, both effects decrease global Sh. particular very sensitive hydrodynamic condition front part where locally higher can characterized intensity velocity. Finally, proposed predict number depending (Re, Sc) (?cap, umax*) parameters, with large range validity (1?Re?100, 1?Sc?500, 0??cap??) based comparison previous numerical studies.
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ژورنال
عنوان ژورنال: International Journal of Heat and Mass Transfer
سال: 2022
ISSN: ['1879-2189', '0017-9310']
DOI: https://doi.org/10.1016/j.ijheatmasstransfer.2022.123325