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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Multi-phase lattice Boltzmann (LB) simulation for convective transport of nanofluids in porous structures with phase interactions
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Multi-phase lattice Boltzmann (LB) simulation for convective transport of nanofluids in porous structures with phase interactions

机译：相互作用多孔结构中纳米流体对流传输的多相晶格Boltzmann（LB）模拟

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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 - Thus 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.
机译：目的 - 高导电多孔介质和纳米流体的组合是提高相关应用的热性能的有效方法。为了精确地预测多孔介质中纳米流体的流动和热传输，本文的目的是探讨相相耦合数值方法。设计/方法/方法 - 基于晶格Boltzmann（LB）方法，本研究结合了多孔基质中纳米流体的对流流动，非平衡热传输和相互作用，提出了一种新的多相LB模型。特别分析微级动量和热相互作用，用于纳米颗粒，基础流体和固体基质。建立了用于基础流体，纳米颗粒和固体基质的流量/热耦合的一组三相LB方程。发现 - 纳米颗粒的分布，纳米颗粒的速度和基础流体的速度，三相温度和相互作用力分析。检查参数对多孔基质中纳米流体对流的影响。与多相模型讨论多孔结构中纳米流体对流转运的热阻。结果表明，瑞利数和达西数对对流特征有重大影响。三相模型的结果温和地大于局部热非平衡模型。原创性/值 - 因此文件首先为多孔结构中纳米流体复合耦合过程创造了多相理论模型，这对于热科学和计算流体动力学领域的研究人员和技术人员有用。

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