窄环隙流道冷却传热特性实验与仿真研究

Experimental and Simulation Study on Cooling Heat Transfer Characteristics in Narrow Annuli Fluid Channel

用实验与仿真的方法对6个不同尺寸的环隙流道进行了单相冷却传热研究。实验表明:窄环隙流道内强迫对流换热与常规流道不同,紊流区明显提前,尺寸为0.94 mm的流道只有紊流区;窄环隙流道对换热起强化、抑制的双重作用。仿真与实验结果符合较好,仿真表明芯管内径变化对窄环隙流道换热有一定影响。

Under the condition of 6 different equivalent diameters,using water as working media,the experiments of cooling heat transfer in annular channel is studied.The results show that the force convention heat transfer in narrow annuli is different with that in conventional channel,in former case the turbulent zone significantly ahead of schedule.When the equivalent diameter is 0.94 mm,only turbulent flow region exists in the channel.Narrow annuli can enhance or inhibit the heat transfer.Simulation and experimental results are in good agreement.The change of inner diameter core pipe has effect on the narrow annuli heat transfer.