多通道烘缸在旋转状态下矩形通道内蒸汽冷凝换热的实验研究

Experimental Research on Steam Condensation and Heat Transfer of Multi-channel Cylinder Dryer with Rectangular Section in Rotation State

关键词:  多通道烘缸  冷凝换热  压降  旋转

Key Words:multi-channel cylinder dryer  condensation heat transfer  pressure drop  rotation

摘要:本研究以高宽比为1∶3的矩形通道为对象，探究了转速和冷却水质量流量对通道内蒸汽冷凝换热及流动压降的影响。结果表明，当转速一定时，通道的平均换热系数随冷却水质量流量增大而增大，通道的流动压降随冷却水质量流量增大而逐渐减小并趋于稳定；当冷却水质量流量一定时，通道的平均换热系数随转速增大先增大后减小，转速在50~100 r/min时，通道的流动压降随转速增加缓慢下降，转速70 r/min时平均换热系数最大。

Abstract:A rectangular channel with an aspect ratio of 1∶3 was used as the research object， and the effects of rotation speed and cooling water mass flow rate on steam condensation heat transfer and flow pressure drop in the channel were studied. The results showed that when the rotation speed was constant， the average heat transfer coefficient of the channel increased with the increase of the cooling water mass flow rate， and the flow pressure drop of the channel gradually decreased and tended to be stable with the increase of the cooling water mass flow rate. When the mass flow rate of cooling water was constant， the average heat transfer coefficient of the channel increased first and then decreased with the increase of rotation speed. When the rotation speed was in the range of 50~100 r/min， the flow pressure drop of the channel decreased slowly with the increase of rotation speed， and the average heat transfer coefficient reached the maximum at rotation speed of 70 r/min.