无吸液芯径向热管的传热机理

Heat fransfer mechanism in radial heat pipe without wick

研究了无吸液芯径向热管的传热机理,由可视化实验推测其换热机理为液体沸腾换热和蒸汽对流换热,在碳钢-水径向热管实验中,所测管壁温度分布证实了以上推测的机理,由实验数据计算沸腾换热量,蒸汽对流换热系数随其流速变化而不断改变,推导出对流换热系数表达式。将换热系数表达式导入计算中,做为传热边界条件,模拟管壁温度以及蒸汽温度和流速。管壁温的计算结果与实验所测值能很好的吻合,这进一步验证了无吸液芯径向热管的传热机理。

Heat fransfer mechanism in radial heat pipe without wick is observed by the visualized experiment in which the mechanism is heat exchange of vapor convection and water boiling. The temperature distributon approves the mechanism in the tested steel-water radial heat pipe. The boiling flux is computed from the experiment data. The vapor convection coefficient changes with its velocity and the coefficient expression is deduced. The expression is compiled by software and becomes the heat exchange boundary. The pipe wall temperature, the vapor temperature and flux velocity are computed.The computed results are coincided with the experiment data of the wall temperature and prove the proposed heat fransfer mechanism in raclial heat pipe without wick further.