含内热源球床通道换热特性实验研究

Experimental Study on Heat Transfer Characteristics of Pebble-Bed Channels with Internal Heat Generation

针对含内热源球床通道内的换热情况,采用电磁感应加热方式对由直径为3 mm、8 mm表面氧化不锈钢球组成的球床通道分别加热,研究球床通道内部的换热特性。通过对实验数据对比分析,得到球床通道内的功率分布情况和换热系数随热流密度、颗粒直径、工质Re的变化规律,并根据实验数据拟合得到球床通道平均换热系数的无量纲准则关联式。拟合结果与实验结果误差在15%以内,符合良好。

Aiming at the pebble bed channels with internal heat source for heating transfer,this paper adopts the electromagnetic induction heating method to separately heat the pebble-bed composed of 3 mm and 8 mm diameter oxidized stainless steel balls and to study the internal heat transfer characteristics.By comparing and analyzing the experimental data,the changing of power distribution and heat transfer coefficient with the heat flux density,particle diameter and Re number of working fluid in the pebble bed channels is obtained,and is fitted to get the dimensionless correlation criteria of the average heat transfer coefficient.The fitting results accord well with the experimental results,and the error is within 15%.