动力型热管内R134a流动沸腾传热过程的特性

发布时间：2018-01-04 09:28

本文关键词：动力型热管内R134a流动沸腾传热过程的特性　出处：《化工学报》2016年05期 　论文类型：期刊论文

【摘要】：针对动力型热管内两相流沸腾过程复杂未知,实验复现性差的问题,搭建了动力型热管两相流沸腾传热实验装置,对水平管内R134a工质沸腾传热过程的沿程阻力特性及对流传热系数进行了实验研究,并将获得的实验数据与前人总结的压降、对流传热系数计算关联式进行对比分析。研究表明,Muller-Steinhagen-Heck压降关联式的积分值与实验结果吻合较好,误差在±10%以内;Mohseni关联式在干度大于0.1时所得对流传热系数与实验结果具有较好一致性,误差在±10%以内,但在干度小于0.1时存在较大偏差,部分误差已超30%,为此重新拟合了干度小于0.1时的对流传热系数关联式。该结果可为该类换热器的实验研究、数值模拟及优化设计提供有效的理论参考标准。
[Abstract]:In order to solve the problem that the boiling process of two-phase flow in dynamic heat pipe is complex and the experimental reproducibility is poor, an experimental apparatus for boiling heat transfer of two-phase flow in dynamic heat pipe is built. The flow resistance characteristics and convection heat transfer coefficient of the boiling heat transfer process of R134a in horizontal tube are studied experimentally. The obtained experimental data are compared with the pressure drop summarized by the predecessors. The correlation formula of convection heat transfer coefficient is compared and analyzed. The results show that the integral value of Muller-Steinhagen-Heck pressure drop correlation is in good agreement with the experimental results. The error is within 卤10%; The convection heat transfer coefficient obtained by the Mohseni correlation is in good agreement with the experimental results when the dryness is greater than 0.1, and the error is within 卤10%, but there is a big deviation when the dryness is less than 0.1. Some of the errors have exceeded 30. For this reason, the correlation formula of convection heat transfer coefficient with dryness less than 0.1 has been refitted. The results can be used for the experimental study of this kind of heat exchangers. Numerical simulation and optimal design provide an effective theoretical reference standard.
【作者单位】：青岛大学能源工程研究所;
【基金】：国家自然科学基金项目(51205214)~~
【分类号】：TK124
【正文快照】： 引言热管作为一种高效传热元件,它利用工质的流动与相变传递热量,已被广泛应用于空调冷量回收及余热回收等场合[1-3]。近年来,本课题组利用热管原理研发出的动力型分离式热管系统,具有低能耗高密度的冷、热能量输运等优点[4]。与其他热管系统相比,该系统在输运能量过程中,溶液

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