波纹板表面凝结传热的数学模型与计算

基于波纹板表面与液膜之间的表面张力作用能减薄液膜厚度而强化传热的机理，建立了竖直波纹板表面的凝结过程的数学模型．计算了波纹板对应于当量平板的凝结传热增强系数．分析了波纹的主要几何参数如波纹节距、波纹板高度、波纹角、波纹倾斜角、波纹圆角半径等对强化传热的影响效应以指导波纹结构的优化．提出了一种能兼顾强化传热效果和适当的流动截面积的双尺度波纹，其凝结传热系数可比当量平板增强1～2倍．

Mathematical model and calculation for heat transfer during condensation on surfaces of corrugated plates

A mathematical model was established for condensation on surfaces of vertical corrugated plates based on the mechanism of heat transfer enhancement to thin down the liquid film due to surface tension effect between corrugated plate surfaces and liquid films. The relative heat transfer coefficients of condensation on corrugation plates were calculated in contrast with equivalent vertical plane ones. The heat transfer enhancement effects for the main geometric parameters such as pitch, height, corrugation angle, tilt angle, and fillet radii of corrugations were analyzed to guide the optimization of corrugation structure for application. A two scale corrugation is suggested, which can compromise both the enhanced heat transfer effect and adequate cross section area for flows, and it makes the heat transfer coefficient 1 to 2 times more than that of an equivalent plane one.