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Journal of Thermal Science

热科学学报

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2024 , Vol. 33 >Issue 1: 41 - 55

DOI: https://doi.org/10.1007/s11630-023-1889-5

Numerical Study on Local Flow and Heat Transfer Characteristics of Supercritical CO2 in PCHE with Sinusoidal Channels

  • WEN Zhexi ,
  • LV Yigao ,
  • LI Qing ,
  • WU Jinglin
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  • School of Energy Science and Engineering, Central South University, Changsha 410083, China

网络出版日期: 2024-01-16

基金资助

The study is supported by the National Natural Science Foundation of China (No. 51806249 and No. 52176093).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023
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Numerical Study on Local Flow and Heat Transfer Characteristics of Supercritical CO2 in PCHE with Sinusoidal Channels

  • WEN Zhexi ,
  • LV Yigao ,
  • LI Qing ,
  • WU Jinglin
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  • School of Energy Science and Engineering, Central South University, Changsha 410083, China

Online published: 2024-01-16

Supported by

The study is supported by the National Natural Science Foundation of China (No. 51806249 and No. 52176093).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023
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摘要

受换热器结构和物性变化等因素影响，超临界CO2局部流动传热特性可能沿程变化较大且对换热器的整体性能有较大影响。本文在超临界CO2布雷顿循环回热器工况下，对超临界CO2在正弦波纹流道印刷电路板换热器中局部流动传热特性开展了数值模拟研究。基于包含10个周期性结构的物理模型，本文分析了Re数、热流大小、Nu数、二次流强度以及其他相关参数在回热器冷热侧的沿程变化情况，探讨了其变化原因，并进一步比较了高温回热器（HTR）和低温回热器（LTR）在冷热侧的流动传热特性沿程变化差异。研究发现，回热器（特别是低温回热器）中局部流动传热特性沿程变化极大，这些变化与热物性参数的复杂变化、浮升力以及周期性变化的离心力等因素相关。LTR中冷侧的局部Re数和对流换热系数从入口到出口的变化幅度分别可达127.5%和61.7%，因此LTR冷侧的对流换热系数不能视为定值或简单取平均处理，换热设计过程中也需要考虑流换热系数的沿程分布情况的影响。论文也发现，当波纹角大于25°时，波纹角相比质量流量对通道内的流场影响更大。此外，重力方向（回热器放置方向）对局部流动传热特性影响较大，但对整体换热效果较小（0.2%）。

关键词： printed circuit heat exchanger; supercritical CO2; sinusoidal channel; heat transfer; recuperator

本文引用格式

WEN Zhexi , LV Yigao , LI Qing , WU Jinglin . Numerical Study on Local Flow and Heat Transfer Characteristics of Supercritical CO2 in PCHE with Sinusoidal Channels[J]. 热科学学报, 2024 , 33(1) : 41 -55 . DOI: 10.1007/s11630-023-1889-5

Abstract

Local heat transfer and flow characteristics, which is crucial to the overall performance of supercritical CO2 recuperators, is rarely examined in details in reported studies. In this paper, the local heat transfer and flow characteristics of supercritical CO2 in sinusoidal channel printed circuit heat exchangers are numerically investigated under the working conditions of recuperators. Based on the simplified physical model constituted by 10 pitches, the variations of Re, heat flux, Nu, secondary flow and other relevant parameters along the flow direction are analyzed firstly. Comparison is further made between the high and low temperature recuperators (HTR and LTR). It’s observed that the local heat transfer and flow characteristics vary greatly from the inlet to the outlet, especially in the LTR. Differences of 127.5% and 61.7% can be observed on the cold side of the LTR for Re and heat transfer coefficient h, respectively. Results indicate that the temperature difference and heat transfer coefficient h should not be regarded as constant and the distribution of h should be carefully considered in the design of the LTR. The complicated interactions among the varying thermophysical properties, buoyancy and the periodically changed centrifugal force are believed to be the key that shapes the flow fields. Furthermore, the changes of the wavy angle θ are found to have greater influence than the changes of mass flow rate in reshaping the flow field when θ>25°. Though gravity direction strongly affects the local heat transfer and flow characteristics, it’s also found that the effects on the overall thermal-hydraulic performance are relatively minor. Yet the installation direction that yields ay=g should better be avoided for the sinusoidal channel printed circuit heat exchanger.

Key words： printed circuit heat exchanger; supercritical CO2; sinusoidal channel; heat transfer; recuperator

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