圆柱形和三角形电极的EHD强化管内沸腾换热试验研究  

EHD enhancement of in-tube boiling heat transfer using cylindrical and triangular rod electrodes

作　　者：刘永启[1] 李瑞阳[1] 郁鸿凌[1] 王发刚[1] 

机构地区：[1]上海理工大学动力工程学院

出　　处：《清华大学学报（自然科学版）》2003年第12期1683-1686,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家"九七三"重点基础研究项目(G2000026302);上海市基础研究重点项目(02DJ14049)

摘　　要：以R-123为工质,对圆柱形电极和三角形电极进行了电水动力学(EHD)强化管内核沸腾换热试验研究。试验换热管为垂直套管式,外层为加热水路,内层为工质回路,中心布置着电极。电场强度范围为0～2.133MV/m,热流密度范围为1.5～10.0kW/m2,换热系数的误差为±9.7%;相应的强化因数的误差为±12.2%。结果表明:两种电极的最大强化因数接近,分别为2.15和2.11;在达到最大强化因数时,三角形电极所需要施加的平均电场强度和能耗比圆柱电极低得多。Electrohydrodynamic enhancement of nucleate boiling heat transfer of R-123 inside tubes was investigated experimentally using cylindrical and triangular rods electrodes. The test section was a vertical tube-in-tube heat exchanger with hot water in the annulus and the test refrigerant in the inner tube. The electric field strengths ranged from 0 to 2.133 MV/m and the heat fluxes ranged from 1.5 kW/m^2 to 10 kW/m^2. The test results show that the uncertainty in the heat transfer coefficient is ±9.7% and the uncertainty in the enhancement factor is ±12.2%; The maximum enhancement factor for the cylindrical rod electrode is 2.11 and that of the triangular rod electrodes is 2.15; However, the average electrical field strength and energy consumption for the maximum enhancement factor for the triangular rod electrode are much lower than for the cylindrical electrode.

关 键 词：圆柱形电极 三角形电极 电水动力学 强化换热 沸腾换热 电极形状 

分 类 号：TK124[动力工程及工程热物理—工程热物理]