Adsorption of surfactants onto the surface of a spherical rising bubble and its effect on the terminal velocity of the bubble
Adsorption of surfactants onto the surface of a spherical rising bubble and its effect on the terminal velocity of the bubble
复制标题
表面活性剂在球形上升气泡表面的吸附及其对气泡终端速度的影响
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
F. Takemura
中科院分区：
文献类型：
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作者：
F. Takemura
通过数值求解Navier-Stokes方程和稳态时表面活性剂在体相和表面的对流扩散方程，估算了表面活性剂在单个上升气泡表面的吸附。然后，雷诺数（Re）和表面活性剂的体积浓度对吸附和气泡的终端速度的影响进行了数值研究。结果表明：（a）表面活性剂在气泡上升方向上的吸附量在气泡前部低于后部，且随Re的增大和表面活性剂体积浓度的减小而增大;（B）可以估算气泡表现为固体颗粒的临界Re（Rec），表面活性剂的平均吸附与Re Re的净吸附-解吸通量为零的平衡吸附相一致。
Adsorption of surfactants onto the surface of a single rising bubble was estimated by numerically solving the Navier–Stokes equation and the convection-diffusion equations of the surfactants in the bulk and on the surface at steady state. Then, the effects of Reynolds number (Re) and bulk concentration of the surfactants on adsorption and on the terminal velocity of the bubble were also numerically studied. The results revealed that (a) adsorption of surfactants at the front of the bubble with respect to the rise direction is lower than that at the back, and the difference increases as Re increases and∕or the bulk concentration of the surfactants decreases, (b) the critical Re (Rec) at which a bubble behaves as a solid particle can be estimated, and (c) the averaged adsorption of surfactants coincides with the equilibrium adsorption corresponding to a zero net adsorption-desorption flux for Re Rec.