多孔涂层横向抽吸效应强化膜状凝结换热的研究

INTERFICIAL SUCTION EFFECTS OF A POROUS LAYER ON FILMWISE CONDENSATION HEAT TRANSFER ENHANCEMENT

研究多孔涂层界面抽吸效应对强化膜状凝结换热的影响。考察了多孔涂层的特性参数对凝液膜厚度和换热系数的影响。与Nusselt理论预示值对照表明，多孔涂层界面抽吸效应是强化膜状凝结换热的重要因素。

Considered the liquid transverse suction effect at the porous layer interface,mathematical models was presented to investigate the influences of the porous layer charac-teristic parameters on condensation heat transfer. The results revealed that the enhancement ratio increased with the increase of the porous layer thickness and permeability. The effectivethermal conductivity of the porous layer was, however, of little significance for condensationheat transfer enhancement. Also, the enhancement mechanism was analyzed by comparisingthe thermal resistances within the external condensate film and the porous layer.