分離壓和表面黏度的協(xié)同作用對液膜排液過程的影響
[Abstract]:In view of the vertical liquid membrane discharge process with insoluble active agents, the surface viscosity model with the change of the concentration of the active agent was introduced, and the thickness of the liquid film was established by using the lubrication theory under the premise of considering the separation pressure. The evolution equations of the concentration of active agent and the surface velocity of liquid film are obtained. The evolution characteristics of liquid film under the condition of constant surface viscosity and variable surface viscosity are analyzed numerically. The results show that the surface viscosity is an important factor affecting the liquid-film efflux process. When the surface viscosity is not considered, the liquid-film surface presents a "flow" mode, whereas a "rigid" mode, and with the increase of the surface viscosity, the liquid film efflux rate obviously slows down. Separation pressure is very important to the formation of "black film". When the separation pressure acts alone, the formation of "black film" is relatively short, but only when the surface viscosity is considered, it can not form a stable "black film". However, under the synergistic action of the two, the "black film" is formed in the middle of the liquid film, which is very thin but very stable, and the appearance time of the "black film" increases with the increase of the surface viscosity. When considering the influence of the concentration of active agent on the surface viscosity, the surface velocity is affected significantly. The formation length and appearance time of the "black film" are similar to the corresponding constant surface viscosity, but the thickness of the "black film" is smaller than that of the corresponding constant surface viscosity.
【作者單位】: 華北電力大學(xué)電站設(shè)備狀態(tài)監(jiān)測與控制教育部重點實驗室;
【基金】:國家自然科學(xué)基金(批準號:11202079) 中央高;究蒲袠I(yè)務(wù)費專項資金(批準號:13MS97)資助的課題~~
【分類號】:O648.24
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