Date of Publication:2015-01-01
Journal:化工学报
Issue:10
Page Number:3826-3833
ISSN No.:0438-1157
Abstract:The hybrid surfaces with hydrophobic and hydrophilic regions arranged regularly and alternatively are prepared. Various widths and area fraction of the hydrophobic region are designed. The droplet properties (such as droplet drainage mode and maximum droplet radius) during steam condensation at atmospheric pressure are visualized. The motion process of condensate on hybrid surfaces is simulated by lattice Boltzmann method. The influences of the widths and surface subcooling of hydrophobic and hydrophilic region on enhancement of the steam condensation heat transfer of the hybrid surfaces are investigated. The influencing factors on the steam condensation heat transfer performance of hybrid surfaces are analyzed and calculated by hybrid condensation heat transfer model. The comparison between model and experimental results is also conducted. It is found that the droplet on the hydrophobic region can spontaneously migrate into the hydrophilic region. The dropwise condensation heat transfer of steam can be effectively enhanced by the finely designed hybrid surfaces. The enhancement factor of the heat transfer performance of the hybrid surface can approach to 1.20. When the width of the hydrophobic region is about 0.55 mm, the heat transfer performance of hybrid surface reaches the maximum. Furthermore, the effect of the heat transfer enhancement of hybrid surfaces decreases with the increase of surface subcooling. The comparison results indicate that the analytical (theoretical) results can well and conveniently <br> predict the experimental results.
Note:新增回溯数据