Investigation of the heat transfer performance of two-phase flow in a novel step-by-step distributed heat exchanger

IF 2.6 3区工程技术 Q2 ENGINEERING, MECHANICAL International Journal of Heat and Fluid Flow Pub Date : 2025-03-01 Epub Date: 2024-12-09 DOI:10.1016/j.ijheatfluidflow.2024.109687

Shuang-gen Yang , Huan-ling Liu

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Abstract

With the miniaturization of electronic chips, and the complexity and diversity of functions, the application of multiple heat source arrays has appeared in recent years. In order to improve the heat dissipation performance of multiple high heat flux chips, this work innovatively designs a step-by-step distributed heat exchanger (SSD), which uses ethanol as coolant and is used for two-phase flow heat dissipation. Then, in order to improve the cooling ability, a crossed step-by-step distributed heat exchanger (CSSD) is proposed by arranging cross flow channels with high heat flux. The VOF two-phase flow numerical method is used to simulate the performance of these two kinds of heat exchangers. In addition, the effects of gravity and inlet height on the performance of the heat CSSD exchanger are studied. The results show that CSSD can shorten the bubble generation time, increases the gas volume fraction in the channel, increase the gas disturbance, and intensify the heat dissipation of two-phase flow compared to the SSD design. The results show that CSSD can reduce the maximum temperature of the heat exchanger and improve the temperature uniformity. Gravity has little effect on two-phase flow heat transfer. In addition, we set up a two-phase flow experimental system to verify the correctness of the numerical simulation. The results indicates that the numerical results are consistent with the experimental results.

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新型分步式换热器中两相流换热性能的研究

随着电子芯片的小型化、功能的复杂化和多样化，近年来出现了多热源阵列的应用。为了提高多个高热流密度芯片的散热性能，本工作创新性地设计了一种分步式分布式换热器（SSD），以乙醇为冷却剂，用于两相流散热。然后，为了提高换热器的冷却能力，提出了一种布置高热流密度的交叉分步式换热器（CSSD）。采用VOF两相流数值方法对这两种换热器的性能进行了数值模拟。此外，还研究了重力和进口高度对CSSD换热器性能的影响。结果表明，与固态硬盘设计相比，CSSD可以缩短气泡产生时间，增加通道内气体体积分数，增加气体扰动，增强两相流散热。结果表明，CSSD可以降低换热器最高温度，提高温度均匀性。重力对两相流换热影响较小。此外，我们建立了一个两相流实验系统来验证数值模拟的正确性。结果表明，数值计算结果与实验结果吻合较好。

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来源期刊

International Journal of Heat and Fluid Flow 工程技术-工程：机械

CiteScore

5.00

自引率

7.70%

发文量

131

审稿时长

33 days

期刊介绍： The International Journal of Heat and Fluid Flow welcomes high-quality original contributions on experimental, computational, and physical aspects of convective heat transfer and fluid dynamics relevant to engineering or the environment, including multiphase and microscale flows. Papers reporting the application of these disciplines to design and development, with emphasis on new technological fields, are also welcomed. Some of these new fields include microscale electronic and mechanical systems; medical and biological systems; and thermal and flow control in both the internal and external environment.