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Multi-phase lattice Boltzmann (LB) simulation for convective transport of nanofluids in porous structures with phase interactions
International Journal of Numerical Methods for Heat & Fluid Flow ( IF 4.2 ) Pub Date : 2021-03-22 , DOI: 10.1108/hff-07-2020-0481
Z.B. Xing , Xingchao Han , Hanbing Ke , Q.G. Zhang , Zhiping Zhang , Huijin Xu , Fuqiang Wang

Purpose

A combination of highly conductive porous media and nanofluids is an efficient way for improving thermal performance of relevant applications. For precisely predicting the flow and thermal transport of nanofluids in porous media, the purpose of this paper is to explore the inter-phase coupling numerical methods.

Design/methodology/approach

Based on the lattice Boltzmann (LB) method, this study combines the convective flow, non-equilibrium thermal transport and phase interactions of nanofluids in porous matrix and proposes a new multi-phase LB model. The micro-scale momentum and heat interactions are especially analyzed for nanoparticles, base fluid and solid matrix. A set of three-phase LB equations for the flow/thermal coupling of base fluid, nanoparticles and solid matrix is established.

Findings

Distributions of nanoparticles, velocities for nanoparticles and the base fluid, temperatures for three phases and interaction forces are analyzed in detail. Influences of parameters on the nanofluid convection in the porous matrix are examined. Thermal resistance of nanofluid convective transport in porous structures are comprehensively discussed with the models of multi-phases. Results show that the Rayleigh number and the Darcy number have significant influences on the convective characteristics. The result with the three-phase model is mildly larger than that with the local thermal non-equilibrium model.

Originality/value

This paper first creates the multi-phase theoretical model for the complex coupling process of nanofluids in porous structures, which is useful for researchers and technicians in fields of thermal science and computational fluid dynamics.



中文翻译:

具有相相互作用的多孔结构中纳米流体对流传输的多相晶格玻尔兹曼 (LB) 模拟

目的

高导电多孔介质和纳米流体的组合是提高相关应用热性能的有效方法。为了精确预测多孔介质中纳米流体的流动和热传递,本文的目的是探索相间耦合的数值方法。

设计/方法/方法

本研究基于格子玻尔兹曼(LB)方法,结合多孔基质中纳米流体的对流流动、非平衡热传输和相相互作用,提出了一种新的多相LB模型。尤其是对纳米颗粒、基础流体和固体基质的微尺度动量和热相互作用进行了分析。建立了一套用于基础流体、纳米颗粒和固体基质流动/热耦合的三相LB方程。

发现

详细分析了纳米颗粒的分布、纳米颗粒和基液的速度、三相的温度和相互作用力。检查参数对多孔基质中纳米流体对流的影响。用多相模型全面讨论了多孔结构中纳米流体对流传输的热阻。结果表明,瑞利数和达西数对对流特性有显着影响。三相模型的结果略大于局部热非平衡模型的结果。

原创性/价值

本文首先建立了多孔结构中纳米流体复杂耦合过程的多相理论模型,对热学和计算流体动力学领域的研究人员和技术人员很有帮助。

更新日期:2021-03-22
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