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采用熔盐作为传热蓄热工质,对螺旋槽管和横纹管内传热特性进行实验研究和比较分析。螺旋槽管和横纹管相比光管均可以有效提高管内传热系数,且槽深增加有利于强化传热。高黏度熔盐传热时,螺旋槽管管内Nu数大于横纹管,螺旋槽管与横纹管对熔盐传热强化倍数随着Re数增加呈缓慢下降趋势。低黏度熔盐传热时,螺旋槽管对熔盐传热强化倍数随着Re数增加呈缓慢下降趋势,而横纹管对熔盐传热强化倍数随着Re数增加呈缓慢上升趋势。螺旋槽管和横纹管对低黏度熔盐传热强化效果好于高黏度熔盐,但横纹管更适合于低黏度高Re数熔盐的强化传热。
The molten salt is used as the heat transfer heat storage medium, and the heat transfer characteristics in the spiral groove tube and the transverse tube are experimentally studied and compared. The spiral tube and transverse tube compared to the light pipe can effectively improve the heat transfer coefficient inside the tube, and the groove depth is conducive to enhanced heat transfer. In high-viscosity molten salt heat transfer, the number of Nu in the spiral groove tube is larger than that of the transverse tube, and the heat transfer enhancement ratio of spiral groove tube and transverse tube to molten salt decreases slowly with the increase of Re number. When heat transfer of low viscosity molten salt, the heat transfer enhancement ratio of spiral groove tube to molten salt decreases slowly with the increase of Reynolds number, and the enhancement ratio of transverse tube to molten salt heat transfer increases slowly with the increase of Re number. Spiral groove tube and transverse tube of low viscosity molten salt heat transfer enhancement is better than the high viscosity molten salt, but the transverse tube is more suitable for low viscosity and high Re number of molten salt enhancement heat transfer.