Numerical study of flow and heat transfer performance of porous-media heat exchanger in millikelvin temperature regime

YU Fan; WANG Qian; CUI Wenhui; LIU Qi; WANG Shaogang

doi:10.11949/0438-1157.20260230

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Numerical study of flow and heat transfer performance of porous-media heat exchanger in millikelvin temperature regime

更新时间：2026-06-29

- Numerical study of flow and heat transfer performance of porous-media heat exchanger in millikelvin temperature regime
- CIESC Journal (2026)
- 作者机构：
  
  中山先进低温技术研究院，广东中山 528400
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20260230
  CLC： TK172
- Received：14 February 2026，
  
  Revised：2026-06-26，
  
  Accepted：29 June 2026，
- 稿件说明：
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YU Fan, WANG Qian, CUI Wenhui, et al. Numerical study of flow and heat transfer performance of porous-media heat exchanger in millikelvin temperature regime[J/OL]. CIESC Journal, 2026.
DOI：

YU Fan, WANG Qian, CUI Wenhui, et al. Numerical study of flow and heat transfer performance of porous-media heat exchanger in millikelvin temperature regime[J/OL]. CIESC Journal, 2026. DOI： 10.11949/0438-1157.20260230.

摘要

液氦与固体界面之间的Kapitza热阻在毫开尔文温区对多孔介质换热器（PMHEs）的流动与传热性能具有重要影响。为探究Kapitza热阻对烧结多孔介质换热器传热效率的影响规律，建立了一个局部热非平衡模型，该模型综合考虑了轴向导热、黏性耗散效应以及Kapitza热阻随温度的变化特性，用于描述多孔介质区域中的传热行为；烧结金属多孔介质内的流体流动采用Brinkman-Forchheimer方程进行模拟。结果表明，该模型能够有效捕捉液氦与固体界面处的温度跳跃现象。基于上述模型，分析了不同工况下的温度和压力变化规律，揭示了其背后的传热机理。此外，研究了Kapitza热阻和轴向导热对传热性能的影响，并系统探讨了流量、传热面积和烧结参数等因素对流动传热性能的影响机制。

Abstract

Kapitza thermal resistance at the interfaces between liquid helium and solid components significantly affects the flow and heat transfer performance of porous-media heat exchangers (PMHEs) in the millikelvin temperature regime. ‌To explore the influence law of Kapitza thermal resistance on the heat transfer efficiency of sintered porous media heat exchangers‌

a clear understanding of its impact is essential for enhancing interfacial heat transfer efficiency in sintered heat exchangers. In this work

‌a local thermal non-equilibrium model is established‌

which comprehensively considers ‌axial heat conduction‌

viscous dissipation effect and the variation characteristics of Kapitza thermal resistance with temperature

‌to describe the heat transfer behavior in the porous media region‌. Fluid flow within the sintered sponges is described using the Brinkman-Forchheimer equations. ‌The results show that the proposed model can effectively capture the temperature jump phenomenon at the interface between liquid helium and solid‌. Based on the above model

‌the variation laws of temperature and pressure under different working conditions are analyzed

and the underlying heat transfer mechanism is revealed‌. Furthermore

‌the effects of Kapitza thermal resistance and axial heat conduction on heat transfer performance are investigated

and the influence mechanism of parameters such as flow rate

heat transfer area and sintering parameters on flow and heat transfer performance is systematically discussed‌. Additionally

the effects of flow rate

heat transfer area

and sintering parameters are systematically studied. Based on these findings

a predictive model for the outlet temperature of the concentrated phase and the cooling power is developed by incorporating viscous dissipation

axial heat conduction

and the temperature dependence of Kapitza thermal resistance.

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references

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