Microscopic mechanisms of heat transfer in horizontal-tube falling film evaporation
作者： Luopeng Yang , Yang Liu , Yan Yang , Shengqiang Shen
DOI: 10.1016/J.DESAL.2016.04.014
关键词: Churchill–Bernstein equation 、 Heat transfer 、 Laminar flow 、 Thermodynamics 、 Heat transfer coefficient 、 Chemistry 、 Film temperature 、 Convective heat transfer 、 Convection 、 Thermal conduction
摘要: Abstract Complex heat and mass transfer phenomena in horizontal-tube falling film evaporators are areas of intense research due to their increasing predominance thermal desalination industries. To better understand the microscopic mechanisms transfer, a computational fluid dynamic model using Volume Fluid (VOF) was developed simulate evaporation. The temperature velocity profiles were determined as part solution governing equations. numerical predicted local dimensionless temperatures, normal tangential velocities, coefficients within thin liquid around tube for varying Reynolds numbers. Profiles temperatures prove that both conduction convection contributes film. A laminar sub-layer is found exist dominate resistance recirculation flow observed at an inclination angle 5° accounts enhancement mechanism transfer. effect decreases with decreasing increases Re thinning sub-layer.
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