Hydrophobic porous membranes with pore-size gradient design for enhancing two-phase flow stability

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Heat and Mass Transfer Pub Date : 2025-05-12 DOI:10.1016/j.ijheatmasstransfer.2025.127200

Donghao Zhao , Yongjia Wu , Dongcheng Liu , Ouyue Zhang , Tingzhen Ming

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引用次数: 0

Abstract

The forced convection boiling exhibits an extremely high heat transfer rate, making it attractive for the effective cooling of electronic devices with high heat fluxes. However, the increase in the vapor fraction along the channel results in the instability of two-phase flow, which is harmful for the long-term safe operation of cooling systems. In this study, a gas-liquid two-phase flow visualization platform was designed, and the feasibility of using hydrophobic porous membranes for gas-liquid phase separation was verified through bubble trapping and liquid-phase blocking experiments. Experiments were conducted using deionized water and air at room temperature to investigate the effects of membrane pore-size, thickness, and gradient-pore-size design on gas-phase separation performance and two-phase flow stability. Under the inlet conditions with a gas flow rate of 1.29 × 10^-³ kg/min and liquid flow rate of 0.6 kg/min, the 3 μm porous membrane reduced the pressure in the two-phase cavity by 49.2 %, decreased pressure fluctuations by 230 %, and significantly suppressed the fluctuations in the inlet-outlet pressure differential. Compared to a single-pore-size membrane of the same thickness, the 3 μm/0.1 μm gradient-pore-size membrane reduced the pressure in the two-phase cavity by 14.6 % and decreased pressure fluctuations by 40 %.

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疏水多孔膜的孔径梯度设计，以提高两相流的稳定性

强制对流沸腾具有极高的传热速率，对具有高热流通量的电子器件的有效冷却具有吸引力。然而，沿通道蒸汽分数的增加会导致两相流的不稳定，不利于冷却系统的长期安全运行。本研究设计了气液两相流动可视化平台，并通过气泡捕获和液相阻塞实验验证了疏水多孔膜用于气液两相分离的可行性。以去离子水和室温空气为实验介质，考察了膜孔径、膜厚度和梯度孔径设计对气相分离性能和两相流动稳定性的影响。在气体流量为1.29 × 10-³kg/min、液体流量为0.6 kg/min的进口条件下，3 μm多孔膜使两相腔内压力降低49.2%，压力波动降低230%，并显著抑制了进出口压差的波动。与相同厚度的单孔径膜相比，3 μm/0.1 μm梯度孔径膜使两相腔内压力降低14.6%，压力波动降低40%。

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来源期刊

International Journal of Heat and Mass Transfer 工程技术-工程：机械

CiteScore

10.30

自引率

13.50%

发文量

1319

审稿时长

41 days

期刊介绍： International Journal of Heat and Mass Transfer is the vehicle for the exchange of basic ideas in heat and mass transfer between research workers and engineers throughout the world. It focuses on both analytical and experimental research, with an emphasis on contributions which increase the basic understanding of transfer processes and their application to engineering problems. Topics include: -New methods of measuring and/or correlating transport-property data -Energy engineering -Environmental applications of heat and/or mass transfer