自由降膜在横向波纹竖壁上的流动与蒸发的分析  

Analysis on the Flow and Evaporation of a Freely Falling Liquid Film Down a Vertical Plate with Transverse Wavy Surface

作　　者：师晋生[1] 

机构地区：[1]天津科技大学机械工程学院,天津300222

出　　处：《天津科技大学学报》2008年第2期50-54,72,共6页Journal of Tianjin University of Science & Technology

基　　金：天津市应用基础研究基金资助项目(07JCYBJC01300)

摘　　要：对竖直放置的横向波纹形壁面上的定型层流自由降落液膜的运动与蒸发传热进行了分析.对这种运动的控制微分方程及边界条件作无量纲化处理,以壁面波纹为摄动参数对方程组进行幂级数展开,得到了摄动分析模型.通过求解该模型获得了液膜流速、温度和自由表面位置的表达式,讨论了壁面波纹对液膜运动的影响.分析表明,在一定的壁面波幅和波数条件下,横向波纹对这种流动的传热有增强作用.A research on the flow and evaporation heat transfer of a fully developed laminar liquid film falling freely down a vertical plate with a transverse wavy surface was carded out. Governing equations of film with their boundary conditions as well were firstly non-dirnensionalized. Assuming the wave amplitude of the plate as perturbations, a perturbation model with zeroth and t-n＇st order sets of governing equations was then developed and was solved by expanding variables into power series. Expressions for film velocity, temperature and position of the free surface of film were obtained. Effects of dimensionless amplitude and wave number of the plate surface wave on the flow and heat transfer of film were discussed. It is shown that, when the wave amplitude and number were properly chosen, solid plate with transverse wavy surface is of enhancement effect on the liquid film heat transfer.

关 键 词：下降液膜 横向波纹 层流 传热 

分 类 号：TK121[动力工程及工程热物理—工程热物理] TQ021.3[动力工程及工程热物理—热能工程]