| 摘要: |
| 电子器件在工作时会因为内部热量无法及时排出而使其工作效率降低。本文建立了矩形小通道的三维模型，研究了使用相变微胶囊悬浮液(MEPCMS)作为流动工质进行散热的方法。分析了MEPCMS强化换热机理，发现将MEPCMS看作两相流来进行模拟更契合实际，利用CFD-DPM(Discrete Phase Model)模型数值模拟了MEPCMS在矩形通道内的对流换热过程，分析Re，质量浓度(cm）和加热热流密度(qw)对换热和流动的影响，提出并分析了综合性能指标(CPI)用以评估冷却系统在保持较低温差的同时对压力损失的控制效果。为了更有效的利用MEPCMS的相变潜热，提出了相变长度因子LX, LX接近1时能够保证MEPCMS在流出流道时完全相变，并拟合出 L_X=0.0476〖Pr〗^1.211 〖Re〗^0.982 〖Qw〗^(-0.594)这一关系式。 |
| 关键词: 数值模拟 相变微胶囊 悬浮液 矩形小通道 关联式 |
| DOI： |
| 投稿时间：2024-08-02修订日期：2024-09-05 |
| 基金项目: |
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| Heat transfer of phase change microcapsule suspensions in small rectangular channels |
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MINXUE, JINTAO, ZHENGZIFENG, GUANXIN
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| (University of Shanghai for Science and Technology) |
| Abstract: |
| When the electronic device is working, its efficiency will be reduced because the internal heat cannot be discharged in time. In this paper, a three-dimensional model of rectangular small channel is established, and the method of heat dissipation using phase change microcapsule suspension (MEPCMS) as the flow medium is studied. The enhanced heat transfer mechanism of MEPCMS was analyzed, and it was found that it was more practical to simulate MEPCMS as a two-phase flow. CFD-DPM(Discrete Phase Model) model was used to numerically simulate the convective heat transfer process of MEPCMS in a rectangular channel. The influence of mass concentration (cm) and heating heat flux (qw) on heat transfer and flow is presented and analyzed. The comprehensive performance index (CPI) is proposed to evaluate the control effect of cooling system on pressure loss while maintaining low temperature difference. In order to make more effective use of the potential heat of the phase transition of MEPCMS, the length factor LX is proposed. When LX is close to 1, it can ensure the complete phase transition of MEPCMS during the discharge channel, and the relation L_X=0.0476〖Pr〗^1.211 〖Re〗^0.982 〖Qw〗^(-0.594) is fitted. |
| Key words: numerical simulation phase change microcapsule suspensions rectangular small channel correlation |