Analysis on thermal performances in the evaporator with double-layered porous domain above flow channels in refrigeration system

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2025-04-11 DOI:10.1016/j.ijthermalsci.2025.109927

Shengjie Zhou, Wei Chen, Deyuan Zhao, Chuntong Li, Xinyi Chen, Hang Shi

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Abstract

In the compression refrigeration cycle system, the double-layered porous domain with small and large porosities respectively in dense and sparse porous layers are set above liquid flow minichannels to form evaporator on bottom heating surface for more heat flux to be enlarged, in which the convection occurs between liquid refrigerant and solid surfaces in channel while evaporation happens in porous layers due to pressure drop. The

S S T k - ω

model illustrating the turbulent flow in liquid flow channel together with Darcy-Brinkman model describing the flow in porous domain or ribs are employed to investigate the effects of porosities and thickness respectively in porous ribs and porous domain on thermal performances in presented evaporator. The coefficient of system performance (COP) is utilized to evaluate the ratio of dissipated heat flux to power consumption in refrigeration system. Compared to the evaporator without porous ribs, the 131 % rise of dissipated heat flux can be obtained in mode with porous ribs paved on side wall surface in liquid channel. Besides, the larger dissipated heat flux and higher COP occur with larger and smaller porosities respectively in dense and sparse porous domains above flow channel in evaporator.

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制冷系统流道上方带有双层多孔畴的蒸发器热性能分析

在压缩制冷循环系统中，在液流微型通道上方设置了致密和稀疏多孔层中分别具有小孔隙率和大孔隙率的双层多孔域，以在底部受热面上形成蒸发器，从而放大更多的热通量，其中液体制冷剂与通道中的固体表面之间发生对流，而蒸发则由于压力降而在多孔层中发生。SSTk-ω 模型说明了液体流道中的湍流，Darcy-Brinkman 模型描述了多孔域或多孔肋条中的流动，这两个模型分别用于研究多孔肋条和多孔域中的孔隙率和厚度对蒸发器热性能的影响。系统性能系数（COP）用于评估制冷系统中耗散的热通量与功耗的比率。与无多孔肋条的蒸发器相比，在液体通道侧壁表面铺有多孔肋条的蒸发器中，散热通量增加了 131%。此外，在蒸发器流道上方的致密多孔域和稀疏多孔域中，孔隙率越大和越小，散热通量越大，COP 越高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Thermal Sciences 工程技术-工程：机械

CiteScore

8.10

自引率

11.10%

发文量

531

审稿时长

55 days

期刊介绍： The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review. The fundamental subjects considered within the scope of the journal are: * Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow * Forced, natural or mixed convection in reactive or non-reactive media * Single or multi–phase fluid flow with or without phase change * Near–and far–field radiative heat transfer * Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...) * Multiscale modelling The applied research topics include: * Heat exchangers, heat pipes, cooling processes * Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries) * Nano–and micro–technology for energy, space, biosystems and devices * Heat transport analysis in advanced systems * Impact of energy–related processes on environment, and emerging energy systems The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.