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切应力协同下受热过冷层流液膜的破断特性

Breakdown of locally heated and subcooled laminar films with interfacial shear

  • 摘要: 针对界面切应力协同下受热过冷层流液膜流动的破断过程, 建立了不同气液流向下的临界液膜厚度和最小润湿量的理论模型, 分析了不同驱动力作用下, 接触角、流体温度、界面切应力和壁面热流密度对液膜破断特性的影响. 研究表明: 临界液膜厚度和最小润湿量均随壁面热流密度的增加而增大; 重力驱动下的接触角影响在不同热流密度下有所不同, 流体温度在不同驱动力下对最小润湿量的影响截然相反; 同向切应力驱动下临界液膜厚度和最小润湿量随切应力增加而减小; 在重力和切应力协同驱动下, 同向切应力对最小润湿量的影响与重力和切应力所起作用的相对大小有关, 反向切应力使得临界液膜厚度和最小润湿量有所增大.

     

    Abstract: The theoretical models of critical film thickness andminimum wetting rate were established for locally heated and subcooledlaminar films under different flow directions of gas and liquid, and theeffects of the contact angle, film temperature, interfacial shear and heatflux were discussed driving by gravity or/and interfacial shear. Theinvestigation shows that the critical film thickness and minimum wettingrate increase with increasing heat flux. The effect of contact angle isclearly different in different range of heat flux under gravity driving, andthe film temperature has a contrary influence on minimum wetting ratedriving by gravity and interfacial shear. The critical film thickness andminimum wetting rate decrease with cocurrent shear. Under the combination ofgravity and interfacial shear, the effect of cocurrent shear on minimumwetting rate is closely related with the ratio of gravity to shear, and theincreasing countercurrent shear leads the critical film thickness andminimum wetting rate to decrease.

     

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