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为探讨新的强化凝结换热的方法,考虑多孔层界面液体间的剪切效应,建立了蒸气在具有多孔涂层倾斜表面膜状凝结换热的物理数学模型。数值计算结果表明:在一定范围内,表面过冷度、多孔涂层的厚度、渗透率和有效导热系数的增大都不同程度地强化凝结换热,表面倾角引起的彻体力的变化对强化凝结换热的影响很大。与Nuselt理论预示值对比显示:多孔涂层具有明显的强化膜状凝结换热的作用,而多孔层的弥散作用是强化凝结换热的主导因素。多孔涂层特征参数的优化研究可为进一步的实验研究提供理论指导。
In order to explore a new method of enhanced condensation heat transfer, a mathematical model of the vapor condensation heat transfer in sloping membrane with porous coating was established considering the shearing effect of liquid in the interface between porous layers. The numerical results show that within a certain range, the surface undercooling, the thickness of the porous coating, permeability and the effective thermal conductivity increase to varying degrees to enhance the condensation heat transfer, surface inclinations caused by changes in the total force on the enhanced condensation The impact of heat is great. The comparison with Nuselt theory indicates that the porous coating has the obvious effect of enhancing the film-like condensation heat transfer, while the diffusion of the porous layer is the dominant factor for enhancing condensation heat transfer. The optimization of the characteristic parameters of porous coatings can provide theoretical guidance for further experimental research.