矩形槽道相变腔内沸腾-凝结共存相变传热的研究

Experimental Study of the Boiling and Condensation Coexisting Phase Change Heat Transfer in the Phase Change Chamber With Rectangular Grooves

以去离子水为工质,研究了矩形槽道相变腔的传热性能,并借助可视化对观察到的实验现象进行了分析研究。实验结果表明:相变腔内沸腾与凝结过程之间存在明显的相互作用,充液率为11.4%时相变腔传热性能最好,原因是此时冷凝传热得到强化。随着输入功率的增大,沸腾与凝结过程之间相互作用增强,沸腾和冷凝表面传热系数均随之增大。相变腔传热热阻主要集中在冷凝表面,在最佳充液率条件下冷凝表面热阻在总热阻中的占比接近70%。

Deionized water was used as the working fluid,the heat transfer performance of the phase change chamber with rectangular grooves was studied,and the observed experimental phenomena were analyzed by visualization.The experimental results show that there is a clear interaction between boiling and condensation processes inside the phase change chamber.The heat transfer performance of the phase change chamber is the best when the working fluid filling ratio is 11.4%,because the condensation heat transfer is enhanced.As the input power increases,the interaction between the boiling and condensation processes increases,and the heat transfer coefficients of the boiling and condensation increase.The heat transfer resistance of the phase change chamber is mainly concentrated on the condensation surface.Under the optimum filling ratio,the condensation surface thermal resistance accounts for nearly 70%of the total thermal resistance.