两相闭式热虹吸管沸腾换热的研究

BOILING HEAT TRANSFER IN A TWO-PHASE CLOSED THERMOSYPHON

本文通过实验和理论分析研究了两相闭式热虹吸管加热段的换热规律及两相流对加热段换热的影响.结果表明,对流换热区换热的强化是加热段有较高的换热系数的主要原因;加热段长度对加热段的平均换热系数有明显的影响,较短的加热段有较高的换热系数.

The heat transfer characteristics of evaporator section and its relation with two-phase flow in a two-phase closed thermosyphon are investigated analytically and experimentally. The results indicate that the enhancement of the convection heat transfer in the convection heat transfer area is responsible for the high heat transfer coefficient in the evaporator section. The lower the saturation temperature the stronger the intensity of heat transfer in the convection heat transfer area. The length of evaporator section has an obvious influence on rhe coefficient of boiling heat transfer. Shorter evaporator section has higher average heat transfer coefficient. And a correlation is introduced to predict the convection heat transfer component in the evaporator section.