Combined Eulerian–Eulerian Multiphase Frost model and solidification and melting model to predict the cooling performance of subcooled eutectic plates

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2025-03-10 DOI:10.1016/j.ijthermalsci.2025.109837

Jihyuk Jeong , Sébastien Poncet , Benoit Michel , Jocelyn Bonjour

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引用次数: 0

Abstract

To limit the environmental footprint of refrigeration, transport of frozen goods based on natural fluids and phase change materials (PCMs) may be a promising solution. However, frost formation on the surface of the PCM encasing might limit the heat exchange and overall efficiency of the frozen food transport. The present work reports the numerical modeling of the heat and mass transfer for a flat plate cooled by a melting PCM located inside an air channel on which frost develops. Eulerian–Eulerian multiphase model is employed in conjunction with the

k - ω

Shear Stress Transport (SST) model to simulate the frost formation on the surface of the PCM encasing. It is first favorably validated against a number of published experimental and numerical data. Then the melting model based on the so-called enthalpy-porosity approach is applied as a User-Defined Function (UDF). The solidification and melting model as an applied UDF has been also validated against experimental and numerical works for lauric acid as PCM. The combined Eulerian–Eulerian Multiphase frost model and the solidification and melting model show that the flow must be below the PCM rather than above, in order to promote the formation of the Rayleigh–Bénard convection cells within the PCM when the melting process begins. Otherwise, the heat released from the frost formation on the surface of the PCM encasing and the heat transferred from the high temperature humid air are not effectively diffused within the PCM and results in localized high-temperature zones within the PCM.

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结合欧拉-欧拉多相霜冻模型和凝固熔化模型对过冷共晶板的冷却性能进行了预测

为了限制制冷的环境足迹，基于天然流体和相变材料（PCMs）的冷冻货物运输可能是一个很有前途的解决方案。然而，PCM包装表面的结霜可能会限制冷冻食品运输的热交换和整体效率。本文报道了由位于有结霜的空气通道内的熔化PCM冷却的平板的传热和传质的数值模拟。采用欧拉-欧拉多相模型结合k−ω剪切应力输运（SST）模型，模拟了PCM外壳表面结霜的形成过程。首先，对一些已发表的实验和数值数据进行了有利的验证。然后将基于焓孔法的熔融模型作为用户定义函数（UDF）加以应用。作为应用UDF的凝固和熔化模型也通过月桂酸作为PCM的实验和数值工作进行了验证。结合欧拉-欧拉多相霜冻模型和凝固-熔化模型表明，在熔化过程开始时，流动必须在PCM下方而不是上方，以促进PCM内rayleigh - b结粒状对流单元的形成。否则，PCM外壳表面结霜释放的热量和高温潮湿空气传递的热量不能在PCM内部有效扩散，导致PCM内部出现局部高温区。

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.