Two-phase flow in compressed copper foam with R134a for high heat flux thermal management: Effects of foam compression ratio and refrigerant operating conditions on thermohydraulic performance
Two-phase flow in compressed copper foam with R134a for high heat flux thermal management: Effects of foam compression ratio and refrigerant operating conditions on thermohydraulic performance
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用于高热通量热管理的 R134a 压缩泡沫铜中的两相流：泡沫压缩比和制冷剂操作条件对热工水力性能的影响
DOI：
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发表时间：
2023
期刊：
影响因子：
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通讯作者：
Denver Schaffarzick
中科院分区：
文献类型：
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作者：
Deogratius Kisitu;A. Ortega;M. Zlatinov;Denver Schaffarzick
大多数以前的研究在金属开孔泡沫集中在单相冷却与空气或水。本文研究了开孔泡沫铜与R134-A制冷剂在两相流沸腾条件下的热工水力性能，其热通量远高于大多数以前的研究。详细的实验结果，提出了泡沫铜介质的热性能和压降，在几何配置类似的，这可能是利用在两相冷板。本研究的关键是研究泡沫的压缩对其热工水力行为和流动沸腾过程中的临界热流密度（CHF）的影响。试样由泡沫样品组成，每个样品的足迹为$\mathbf{25}。\ mathbf{4}\ \mathbf{mm} \times \mathbf{25}.\ mathbf{4}\ \mathbf{mm}$，高度为2.54 mm，焊接到铜基板上。泡沫样品包括基线未压缩样品，以及具有2X和4X的压缩比（CR）、分别具有0.91、0.82和0.62的孔隙率并且各自具有40 PPI的孔径的两个其它样品。试样安装在一个设计的流量夹具中，该夹具允许制冷剂流进入入口歧管，然后通过泡沫，然后流到出口歧管。实验测试的热通量为1.4至175 W/cm 2，质量通量为125至250 kg/m2 s，入口饱和温度为30至40 °C，同时入口过冷度为0至20 °C。结果表明，泡沫金属压缩比、入口过冷度和饱和温度对泡沫金属流动沸腾的热阻、最佳出口干度、CHF和压降有很大影响。
Most previous research in metallic open-cell foams has focused on single-phase cooling with air or with water. This work examines the thermohydraulic performance of open-cell copper foam with R134-a refrigerant in two-phase flow boiling conditions at heat fluxes well above those examined in majority of previous studies. Detailed experimental results are presented for the thermal performance and pressure drop of copper foam media, in geometric configurations similar to that which may be utilized in a two-phase cold plate. Key to the present study is an investigation of the effects of compression of the foam on its thermohydraulic behavior and critical heat flux (CHF) during flow boiling. The test coupons consist of foam samples, each with a footprint of $\mathbf{25}.\mathbf{4}\ \mathbf{mm} \times \mathbf{25}.\mathbf{4}\ \mathbf{mm}$ and a height of 2.54 mm, which are soldered to a copper base plate. The foam samples include a baseline uncompressed sample, and two other samples with compression ratios (CR) of 2X and 4X, with porosities of 0.91, 0.82 and 0.62, respectively, and each with a pore size of 40 PPI. The test coupons are mounted in an engineered flow fixture that allows refrigerant flow to enter in an inlet manifold, then through the foam, before flowing to an exit manifold. Experimental tests were performed for heat fluxes from 1.4 to 175 W/cm2, with mass fluxes ranging from 125 to 250 kg/m2s and inlet saturation temperatures of 30 to 40 °C, while varying the inlet subcooling from 0 to 20 °C. Results show that thermal resistance, optimum exit vapor quality, CHF, and pressure drop for flow boiling in compressed metal foams depend strongly on foam compression ratio, inlet subcooling and saturation temperature.
流动冲击分流微通道液冷冷板的热工水力分析模型
DOI：
10.1115/ipack2021-73283
发表时间：
2021
期刊：
Proceedings of the 2021 ASME InterPACK
影响因子：
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作者：
Kisitu, Deogratius;Ortega, Alfonso
通讯作者：
Ortega, Alfonso