Numerical simulation study on heat transfer characteristics of new heat exchange fins

Hongkang MIAO; Yushuang CHEN; Liushuai LYU; Naxiu WANG

doi:10.11889/j.0253-3219.2018.hjs.41.100601

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Numerical simulation study on heat transfer characteristics of new heat exchange fins

NUCLEAR ENERGY SCIENCE AND ENGINEERING | 更新时间：2021-05-19

- Numerical simulation study on heat transfer characteristics of new heat exchange fins
  封面论文
- NUCLEAR TECHNIQUES Vol. 41, Issue 10, Article number: 100601(2018)
- 作者机构：
  
  1.中国科学院上海应用物理研究所嘉定园区上海 201800
  2.上海卫星工程研究所上海 201109
  3.中国科学院大学北京 100049
- 作者简介：
- 基金信息：
  
  Strategic Priority Program of Chinese Academy of Sciences
- DOI：10.11889/j.0253-3219.2018.hjs.41.100601
  CLC： TK172
- Received：04 June 2018，
  
  Revised：30 July 2018，
  
  Published：10 October 2018
- 稿件说明：
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Hongkang MIAO, Yushuang CHEN, Liushuai LYU, et al. Numerical simulation study on heat transfer characteristics of new heat exchange fins[J]. Nuclear techniques, 2018, 41(10): 100601
DOI：

Hongkang MIAO, Yushuang CHEN, Liushuai LYU, et al. Numerical simulation study on heat transfer characteristics of new heat exchange fins[J]. Nuclear techniques, 2018, 41(10): 100601 DOI： 10.11889/j.0253-3219.2018.hjs.41.100601.

摘要

为提高双熔盐板翅式换热器的紧凑度和热工水力性能，对新型翅片（流线型及改进流线型）的热工特性开展数值模拟研究。在熔盐工质下与传统矩形翅片相比，流线型翅片换热系数提高了3.6%~6.7%，综合性能指标平均提高2%，且高流速工况下换热能力有较大提升；改进流线型翅片的压损，较矩形翅片减少了6.2%，比流线型翅片减少了12%；在水工质下，各型式翅片综合性能指标与熔盐工质时相比均有较大幅度的提升，但新型翅片相比传统矩形翅片不再具有优势，流线型翅片型式具有在熔盐介质的独特适用性。

Abstract

Background

The molten-salt heat exchanger is an important part of thorium molten salt reactor with liquid fuel (TMSR-LF1) integrated simulation platform

and its thermohydraulic performace is critical to the safety in operation. Furthermore

there are many problems in traditional shell and tube heat exchangers. It is very important to develop new heat exchanger.

Purpose

This study aims to redesign heat exchange fins to improve the compactness and thermohydraulic performance of molten salt heat exchanger by numerical simulation.

Methods

Simulation software FLUENT was employed to design and improve different fin types

and the numerical results of each type were compared and analyzed from three aspects:pressure drop

heat transfer coefficient and comprehensive performance index. The numerical simulation under the condition of water is carried out

and the results are compared with those of molten salt.

Results

Compared with the traditional rectangular fins

the heat transfer coefficient of streamline fin in molten salt is increased from 3.6% to 6.7%

the comprehensive performance index is increased by 2% on average

the overall compactness is enhanced

and the heat transfer capacity is greatly improved at high velocity. The improved streamline fin has a minimum pressure drop of 6.2% and 12% lower than that of the rectangular fin and the streamline fin

respectively. The comprehensive performance index of each fin was greatly improved under the water condition

but the streamline fin was no longer superior to the traditional rectangular fin in the water phase.

Conclusion

It reflects the unique applicability of streamline fin type in molten salt medium.

关键词

Keywords

references

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