Convective heat transfer of molten salt in the shell-and-tube heat exchanger with segmental baffles
Convective heat transfer of molten salt in the shell-and-tube heat exchanger with segmental baffles
复制标题
分段折流板管壳式换热器中熔盐的对流传热
DOI：
10.1016/j.ijheatmasstransfer.2017.05.075
复制
发表时间：
2017-10-01
影响因子：
5.2
通讯作者：
Zhu, Han-Hui
中科院分区：
文献类型：
--
作者：
Du, Bao-Cun;He, Ya-Ling;Zhu, Han-Hui
本文设计了一种特殊的U形管流场布置，用于管壳式换热器壳侧熔盐传热性能的实验室测试。在此基础上，对高温（209.41-241.49 ℃）熔盐在弓形折流板STHE-SB中的过渡对流HTPs（6142 < Re < 9125）进行了实验研究，并拟合了相应的传热关联式。然后对传统的关联式在熔盐STHE-SB中的应用进行了验证。最后，对熔融盐STHE-SB的强化传热效果进行了比较。结果表明，拟合关系式与试验数据吻合较好，误差在2%以内。传统的克恩关联式与实验数据的最大偏差为7.1%，仍然适用于分析熔融盐STHE-SB的高温高压。弓形折流板在低流速区的强化效果优于高流速区，最大努塞尔数增加26%。(C)2017爱思唯尔有限公司版权所有
In this paper, a special flow layout with U-shaped tubes applied in the laboratory was designed for testing the heat transfer performances (HTPs) of molten salt in the shell side of a shell-and-tube heat exchanger (STHE). Based on this design, the transitional convective HTPs (6142 < Re < 9125) of molten salt with higher temperature (209.41-241.49 degrees C) in the STHE with segmental baffles (STHE-SBs) were experimentally studied, and the corresponding heat transfer correlations were fitted. Then the validation of the traditional correlation applied in the molten salt STHE-SBs was conducted. Finally, the comparison of heat transfer enhancement in the molten salt STHE-SBs was discussed. The results show that a good agreement with 2% deviations exists between the fitted correlations and the test data. Meanwhile, the traditional Kern correlation, with a 7.1% maximum deviation compared with the test data, is still appropriate to analyze the HTPs of molten salt STHE-SBs. The effects of segmental baffles on the molten salt heat transfer enhancement in lower flow rate region are better than those in higher flow rate region, and the maximum increment of Nusselt number is 26%. (C) 2017 Elsevier Ltd. All rights reserved.