室温磁制冷活性蓄冷器多孔介质模型及其数值模拟

刘敏; 俞炳丰

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室温磁制冷活性蓄冷器多孔介质模型及其数值模拟

专题研究 | 更新时间：2025-07-09

- 室温磁制冷活性蓄冷器多孔介质模型及其数值模拟
- Porous Media Model for Active Magnetic Regenerator of Room Temperature Magnetic Refrigeration and Its Numerical Simulation
- 西安交通大学学报 2009年43卷第3期页码：31-35
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
  
  : 2008-06-11. 作者简介: 刘敏(1983-),男,博士生;俞炳丰(联系人),男,教授,博士生导师. 基金项目: 国家自然科学基金资助项目(50876082)
- DOI：
  中图分类号： TB61;TB66
- 网络首发：2009-03-10，
  
  纸质出版：2009
- 稿件说明：
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刘敏, 俞炳丰. 室温磁制冷活性蓄冷器多孔介质模型及其数值模拟[J]. 西安交通大学学报, 2009,43(3):31-35.

Porous Media Model for Active Magnetic Regenerator of Room Temperature Magnetic Refrigeration and Its Numerical Simulation[J]. 2009, 43(3): 31-35.
刘敏, 俞炳丰. 室温磁制冷活性蓄冷器多孔介质模型及其数值模拟[J]. 西安交通大学学报, 2009,43(3):31-35. DOI：

Porous Media Model for Active Magnetic Regenerator of Room Temperature Magnetic Refrigeration and Its Numerical Simulation[J]. 2009, 43(3): 31-35. DOI：

摘要

鉴于活性蓄冷器作为室温磁制冷核心部件

建立了活性蓄冷器二维复杂多孔介质模型

采用分子场理论计算励(退)磁过程磁性工质温度及磁熵变化

考虑了非Darcy效应、驻留流体、两相热扩散效应、热流边界效应及流体物性非定常的影响.采用有限差分法对两相能量方程进行离散求解.通过计算结果与实验结果的比较对模型进行了验证

认为所建模型能有效反映蓄冷器运行规律并模拟其内部温度分布.数值模拟结果显示:磁场强度变化为2.18 T条件下蓄冷器内金属Gd在其居里点处的温度改变为1.85 K; 蓄冷器内部温度梯度明显

微元循环存在显著复叠现象; 热流边界效应会导致蓄冷器制冷性能下降

流量较大时物性参数对制冷性能影响较大; 在壁面热流通量为5 W/m

的条件下

蓄冷器获得的最大制冷量为201.8 W

对应性能系数为4.79.

Abstract

A two-dimensional complicated porous media model for an active magnetic regenerator of room temperature magnetic refrigeration was established. In the model

the molecular-field theory was adopted to calculate the temperature and magnetic entropy of magnetic material in magnetization(demagnetization)process and the influence of non-Darcy effect

water stored

thermal dispersion effect

heat flux boundary effect and variable fluid physical properties on numerical results was considered. The finite difference method was used to discretize and solve the two-phase energy equations. The present model was verified by experimental results. The numerical results show that the temperature change of Gd at its Curie temperature was 1.85 K under a magnetic field of 2.18 T; distinct temperature grades and overlapping phenomenon of infinitesimal element cycles existed in the regenerator; heat flux boundary effect reduced the refrigeration performance of the regenerator

and fluid physical properties influenced the refrigeration performance of the regenerator greatly at large fluid flux; the regenerator obtained a maximum refrigeration capacity of 201.8 W with a corresponding coefficient of performance of 4.79.

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Keywords

references

YU B F, GAO Q, ZHANG B, et al. Review on research of room temperature magnetic refrigeration [J]. International Journal of Refrigeration, 2003, 26(6): 622-636.

刘敏, 俞炳丰, 胡张保. 室温磁制冷最新研究进展[J]. 制冷学报, 2007, 28(4): 1-11.

LIU Min, YU Bingfeng, HU Zhangbao. New development of research on room temperature magnetic refrigeration [J]. Journal of Refrigeration, 2007, 28(4): 1-11.

高强, 俞炳丰, 张斌, 等. 室温磁制冷活性蓄冷器性能预测研究[J]. 西安交通大学学报, 2004, 38(3): 262-265.

GAO Qiang, YU Bingfeng, ZHANG Bin, et al. Performance prediction of active magnetic regenerator of room temperature magnetic refrigeration [J]. Journal of Xi'an Jiaotong University, 2004, 38(3): 262-265.

LI P, GONG M Q, YAO G H, et al. A practical model for analysis of active magnetic regenerative refrigerators for room temperature applications [J]. International Journal of Refrigeration, 2006, 29(8): 1259-1266.

高强. 室温磁制冷往复式活性蓄冷器制冷性能实验研究及计算模拟 [D]. 西安:西安交通大学能源与动力工程学院, 2005.

WADE B A, SCHULTZ D H. Numerical simulation of the active magnetic regenerator [J]. Computers and Mathematic with Applications, 2005, 49: 1525-1538.

AMIRI A, VAFAI K. Transient analysis of incompressible flow through a packed bed [J]. International Journal of Heat and Mass Transfer, 1998, 41(24): 4259-4279.

AMIRI A, VAFAI K. Analysis of dispersion effects and non-thermal equilibrium, non-Darcian, variable porosity incompressible flow through porous media [J]. International Journal of Heat and Mass Transfer, 1994, 37(6): 939-954.

Achenbach E. Heat and flow characteristics of packed beds [J]. Experimental Thermal and Fluid Science, 1995, 10(1): 17-27.

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