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强迫对流条件下,湿空气绕流具有逆压梯度和大曲率冷壁表面,将导致速度边界层分离,形成大尺度旋涡。本文根据实验中观察到的半球和圆柱后部旋涡对结霜的滞止作用,建立了旋涡的简化模型,并直接积分运动微分方程,确定流场的压力分布,最后分析了压力场对水蒸汽质量浓度和对凝华结霜的影响。从实验和理论上阐明旋涡对凝华结霜的滞止作用。
Under forced convection conditions, the wet air has a reverse pressure gradient around the flow and a large curvature of the cold wall surface, resulting in the separation of the velocity boundary layer and the formation of large-scale vortices. In this paper, based on the observed stagnation of frost on the hemispheres and rear vortices in the experiment, a simplified vortex model was established and the differential equations of motion were directly integrated to determine the pressure distribution in the flow field. Finally, the effect of pressure field on water vapor Mass concentration and effect on the condensation frost. From the experimental and theoretical elucidation of stagnation of the vortex on the deflagration frost effect.