Pore-Scale Study of Gas Natural Convection In Confined Porous Media Based on Lattice Boltzmann Method

IF 1.9 4区工程技术 Q2 ENGINEERING, MECHANICAL Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-10-30 DOI:10.1115/1.4063903

Ammar Tariq, Yueqi Zhao, Adnan Munir, Peilin Cui, Zhenyu Liu

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Abstract

Abstract Gas natural convection is one common phenomenon in industrial applications, especially for the thermal management of electronic devices. In this study, a numerical model for gas natural convection in a confined porous cavity is constructed based on the lattice Boltzmann (LB) method, which predicts the density-difference-induced flow using a multiple relaxation time (MRT) collision operator. At the gas-solid interfaces, the micro-scale flow and heat transfer effects are formulated using an effective slip boundary condition. The established LB model is applied to investigate the Nusselt number for heated obstacles arranged in a staggered formation in the cavity. Based on the calculated data, the Nusselt number values obtained for a 5-cylinder pore-scale (single pore, SP) domain are analyzed and compared to those for a 13-cylinder (multi pore, MP) one. The Nusselt number shows a sharp decrease as soon as the micro-scale effect is considered at the obstacle walls. It was also observed that the Nusselt number for MP domain achieved lower values than that of SP one. The findings in this work can contribute to the design of thermal management device with confined porous media.

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基于晶格玻尔兹曼方法的密闭多孔介质中气体自然对流的孔隙尺度研究

摘要气体自然对流是工业应用中的一种常见现象，尤其适用于电子设备的热管理。本文基于晶格玻尔兹曼(LB)方法建立了密闭多孔腔内气体自然对流的数值模型，该模型使用多重松弛时间(MRT)碰撞算子预测密度差诱导的流动。在气固界面处，采用有效滑移边界条件对微尺度流动和换热效应进行了描述。将所建立的LB模型应用于研究腔内交错排列的加热障碍物的努塞尔数。基于计算数据，分析了5柱孔隙尺度(单孔，SP)域与13柱孔隙尺度(多孔，MP)域的Nusselt数值。在障壁处考虑微尺度效应后，努塞尔数急剧下降。MP结构域的努塞尔数比SP结构域的努塞尔数要低。研究结果可为密闭多孔介质热管理装置的设计提供参考。

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来源期刊

Journal of Heat Transfer-transactions of The Asme 工程技术-工程：机械

自引率

0.00%

发文量

182

审稿时长

4.7 months

期刊介绍： Topical areas including, but not limited to: Biological heat and mass transfer; Combustion and reactive flows; Conduction; Electronic and photonic cooling; Evaporation, boiling, and condensation; Experimental techniques; Forced convection; Heat exchanger fundamentals; Heat transfer enhancement; Combined heat and mass transfer; Heat transfer in manufacturing; Jets, wakes, and impingement cooling; Melting and solidification; Microscale and nanoscale heat and mass transfer; Natural and mixed convection; Porous media; Radiative heat transfer; Thermal systems; Two-phase flow and heat transfer. Such topical areas may be seen in: Aerospace; The environment; Gas turbines; Biotechnology; Electronic and photonic processes and equipment; Energy systems, Fire and combustion, heat pipes, manufacturing and materials processing, low temperature and arctic region heat transfer; Refrigeration and air conditioning; Homeland security systems; Multi-phase processes; Microscale and nanoscale devices and processes.