空穴效应下泡沫金属复合相变材料热性能数值模拟

潘涵婷; 许多; 徐洪涛; 罗祝清

doi:10.21656/1000-0887.440082

空穴效应下泡沫金属复合相变材料热性能数值模拟

doi: 10.21656/1000-0887.440082

上海理工大学能源与动力工程学院，上海 200093

基金项目:

上海市自然科学基金(面上项目) 20ZR1438700

详细信息

作者简介:
潘涵婷(1999—)，女，硕士生(E-mail: 1041580589@qq.com)

通讯作者:
徐洪涛(1976—)，男，教授，博士，博士生导师(通讯作者. E-mail: htxu@usst.edu.cn)

中图分类号: TK124; O351.3
计量
- 文章访问数: 266
- HTML全文浏览量: 163
- PDF下载量: 64
- 被引次数: 0
出版历程
- 收稿日期: 2023-03-27
- 修回日期: 2023-09-14
- 刊出日期: 2024-01-01

Numerical Analysis on Thermal Performances of Metal Foam Composite Phase Change Materials Under Cavity Effects

School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, P.R.China

摘要

摘要: 在三维泡沫金属复合相变材料(PCM)基础上，构建了随机分布空穴模型，采用多松弛时间格子Boltzmann方法，从孔隙尺度分析了不同空穴体积分数、分布位置及泡沫金属与PCM导热系数比下的空穴效应. 结果表明，随着空穴体积分数的增加，减缓了复合PCM的传热速度，并降低了潜热储能的能力. 在Fourier数Fo=0.7时刻下，当空穴体积分数分别为2.4%，7.6%和11.7%时，相较于无空穴情况下的储热量分别减少了3.2%，9.0%和13.0%. 当体积分数为3%的空穴集中在热壁面侧时，其对复合PCM熔化过程的阻碍作用最显著，此时空穴层相当于绝热层，使复合PCM的整体熔化时间延长了6.1%. 为削弱空穴效应，可选择导热系数比超过100的泡沫金属骨架来提高其在传热中的主导作用.
- 相变 /
- 泡沫金属 /
- 空穴 /
- 熔化 /
- 格子Boltzmann方法
Abstract: A randomly distributed cavity model was constructed for 3D metal foam composite phase change materials (PCMs), and the multi-relaxation time lattice Boltzmann method was used to explore the cavity effects with different volume fractions, distribution locations, and thermal conductivity ratios of metal foam to PCM at the cavity scale. The results show that, with the increase of the cavity volume fraction, the heat transfer rate and latent heat storage capacity of composite PCMs would decrease. At a Fourier number of 0.7, compared to the case without cavity, the heat storage decreases respectively by 3.2%, 9.0%, and 13.0% for a cavity volume fraction of 2.4%, 7.6%, and 11.7%, respectively. The significant hindering effect on the melting process of composite PCMs occurs in the case of cavities with a volume fraction of 3% and concentrated near the high-temperature wall. The cavities act as an adiabatic layer, extending the complete melting time of composite PCMs by 6.1%. To weaken the cavity effect, the metal foam skeleton with a thermal conductivity ratio of more than 100 can be selected to improve its leading role in heat transfer.
- phase change /
- metal foam /
- cavity /
- melting /
- lattice Boltzmann method

HTML全文

图 1 三维模型介绍

注为了解释图中的颜色，读者可以参考本文的电子网页版本，后同.

Figure 1. The introduction of three-dimensional models

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图 2 界面耦合传热验证

Figure 2. Verification of the interface coupled heat transfer

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图 3 三维固液相变验证

Figure 3. The 3D solid-liquid phase change verification

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图 4 网格无关性验证

Figure 4. The grid independence check

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图 5 矩形腔整体及截面处温度分布图

Figure 5. Temperature distributions of the whole and the cross section of the rectangular cavity

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图 6 不同ξ下复合PCM的熔化参考比X和潜热储能量Q

Figure 6. The melting reference ratio X and latent heat storage energy Q of composite PCMs with different ξ values

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图 7 不同ξ下复合PCM平均温度和热壁面平均Nusselt数

Figure 7. The average temperature and Nusselt number of composite PCMs with different ξ values

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图 8 不同空穴分布位置下的截面y=35处的温度分布图(ξ=3%)

Figure 8. Temperature contours at y=35 with different void distribution locations(ξ=3%)

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图 9 不同空穴分布位置下复合PCM的熔化参考比X和完全熔化时间

Figure 9. The melting reference ratio X and total melting time with different cavity distribution locations

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图 10 不同k_s下复合PCM的熔化参考比X和完全熔化时间

Figure 10. The melting reference ratio X and total melting time of composite PCMs with different thermal conductivity ratios

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