含内热源堆积球床对流换热特性的实验研究

摘要

In order to research the heat transfer characteristics of pebble bed channels with an internal heat source, the electromagnetic induction heating method was adopted in this paper. This caused overall heating of the pebble bed which was composed of 8 mm diameter surface-oxidated steel balls. The rules of power distribution and heat transfer coefficients changing with heat flux density, inlet temperature, and the working fluid s Re number were researched. According to the experimental data fitting, the dimensionless heat transfer coefficient correlation criteria were obtained, and it was found that the fitting and experimental results agree well within a 7% difference.%为了研究含内热源球床通道内的换热特性,采用直径为8 mm表面氧化碳钢球堆积形成球床,并采用电磁感应加热方式对球床进行整体加热.研究了球床通道内部的功率分布情况和换热系数随热流密度、工质Re的变化规律；并且根据实验数据拟合得到了球床通道内换热系数的无量纲准则关联式,拟合结果与实验结果的偏差在7％以内,符合良好.