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采用流体体积(volume of fluid,VOF)法研究了湿空气吹扫和恒定热流密度条件下降膜流动的传热传质特性,考虑了表面张力和气液相间传质对液膜流动的影响。计算结果表明,液膜可以有效的降低固体壁面温度,越接近液相进口,局部努塞尔数越大,对流传热强度越大;远离液相进口,局部努塞尔数逐渐减小;湿空气的吹扫加快了液膜的蒸发过程,沿着气相流动方向,湿空气的含湿量不断增加,带走汽化潜热,强化了对固体壁面的冷却。
The volume of fluid (VOF) method was used to study the heat and mass transfer characteristics of falling film flow under wet air purging and constant heat flux density. The effects of surface tension and mass transfer between gas and liquid phases on liquid film flow were considered. The results show that the liquid membrane can effectively reduce the solid wall temperature, the closer it is to the liquid inlet. The larger the local Nusselt number, the greater the convective heat transfer. The liquid Nusselt number decreases gradually away from the liquid inlet. The purging of the air accelerates the evaporation process of the liquid film. Along the flow direction of the gas phase, the moisture content of the humid air is continuously increased, taking away the latent heat of vaporization and strengthening the cooling of the solid wall.