Conjugated Flow and Heat Transfer Characteristics of Liquid Lead and Supercritical Carbon Dioxide in Spiral Coil Heat Exchanger

LI Liangxing; LEI Zhenxin; ZHAO Haoxiang; SHI Shang; XU Xiangyang; XIANG Zutao

doi:10.7652/xjtuxb202410019

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Conjugated Flow and Heat Transfer Characteristics of Liquid Lead and Supercritical Carbon Dioxide in Spiral Coil Heat Exchanger

更新时间：2025-07-28

- Conjugated Flow and Heat Transfer Characteristics of Liquid Lead and Supercritical Carbon Dioxide in Spiral Coil Heat Exchanger
- Vol. 58, Issue 10, Pages: 212-221(2024)
- 作者机构：
  
  西安交通大学动力工程多相流国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202410019
  CLC： TL333
- Online First：10 October 2024，
  
  Published：2024
- 稿件说明：
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LI Liangxing, LEI Zhenxin, ZHAO Haoxiang, et al. Conjugated Flow and Heat Transfer Characteristics of Liquid Lead and Supercritical Carbon Dioxide in Spiral Coil Heat Exchanger[J]. 2024, 58(10): 212-221.
DOI：

LI Liangxing, LEI Zhenxin, ZHAO Haoxiang, et al. Conjugated Flow and Heat Transfer Characteristics of Liquid Lead and Supercritical Carbon Dioxide in Spiral Coil Heat Exchanger[J]. 2024, 58(10): 212-221. DOI： 10.7652/xjtuxb202410019.

摘要

为探究螺旋盘管式主换热器内的耦合流动传热机理

基于等长度分段模型

构建了以液态铅和超临界二氧化碳为工质的螺旋盘管式主换热器原型及模化比例样件的理论设计方法

并利用相似性原理完成了主换热器小比例样件设计。以主换热器小比例样件为研究对象

通过SST k-ω湍流模型数值分析了液态铅和超临界二氧化碳在螺旋盘管换热器内的流动传热特性。计算结果表明:螺旋盘管换热器内耦合流动传热性能主要受壳侧质量流量、管侧质量流量和壳侧工质入口温度影响; 管侧超临界二氧化碳质量流量对螺旋盘管换热器内耦合流动传热性能的影响最为显著

在超临界二氧化碳质量流量增加52.4%的条件下

螺旋管的平均表面换热系数增大了21.2%; 在壳侧液态铅的质量流量和入口温度分别增大94.6%、20 K的情况下

螺旋管内的表面传热系数分别增大了5.5%、3.3%。该研究可为螺旋盘管式换热器的工况选择和高效设计提供理论指导。

Abstract

To investigate the conjugated flow and heat transfer mechanism of the spiral coil heat exchanger

the theoretical design method of the prototype and scaled sample of the spiral coil heat exchanger using liquid lead and supercritical carbon dioxide as working fluid is established based on the equal-length piecewise model

and the small-scale sample of the spiral coil heat exchanger is designed using the principle of similarity. With the small-scale sample designed as the object of study

the flow and heat transfer characteristics of liquid lead and supercritical carbon dioxide in the spiral coil heat exchanger are numerically analyzed by using the SST k-ω turbulence model. The results show that the conjugated flow and heat transfer performance in the spiral coil heat exchanger was mainly influenced by the shell-side mass flow rate

tube-side mass flow rate

and shell-side inlet temperature of working fluid. Among these factors

the tube-side mass flow rate of supercritical carbon dioxide had the most significant impact on the conjugated flow and heat transfer performance in the spiral coil heat exchanger. The average surface heat transfer coefficient of the spiral tube increased by 21.2% when the mass flow rate of supercritical carbon dioxide increased by 52.4%

and the surface heat transfer coefficients in the spiral tube increased by 5.5% and 3.3% when the shell-side mass flow rate and inlet temperature of liquid lead increased by 94.6% and 20 K

respectively. This study may provide theoretical guidance for the selection of operation parameters and efficient design of the spiral coil heat exchanger.

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