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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Transient natural convection in a partially open trapezoidal cavity filled with a water-based nanofluid under the effects of Brownian diffusion and thermophoresis
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Transient natural convection in a partially open trapezoidal cavity filled with a water-based nanofluid under the effects of Brownian diffusion and thermophoresis

机译:在布朗扩散和热泳作用下,在充满水基纳米流体的部分开放梯形腔中的瞬态自然对流

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摘要

Purpose - The purpose of this paper is to study about the natural convection of water-based nanofluid in a partially open trapezoidal cavity under the influence of Brownian diffusion and thermophoresis. Design/methodology/approach - Governing equations formulated in dimensionless stream function -vorticity variables - have been solved by finite difference method with a homemade code C++. Effects of Rayleigh number (Ra = 50-1,000), Lewis number (Le = 10-1,000), buoyancy-ratio parameter (Nr = 0.1-5.0), Brownian motion parameter (Nb = 0.1,1.0) and thermophoresis parameter (Nt = 0.1,1.0) on nanofluid flow and heat transfer have been studied. Findings - It is found that high values of Rayleigh and Lewis numbers lead to the homogenization of nanoparticles distributions. For high values of Nt and Nb, heating is more essential and the cavity average temperature rises. Originality/value - The originality of this work is to analyze natural convection in an open-sided trapezoidal cavity with Brownian diffusion and thermophoresis.
机译:目的-本文的目的是研究在布朗扩散和热泳的影响下,部分开放的梯形腔中水基纳米流体的自然对流。设计/方法/方法-用无量纲流函数公式化的控制方程-涡度变量-已通过有限差分法用自制代码C ++求解。瑞利数(Ra = 50-1,000),路易斯数(Le = 10-1,000),浮力比参数(Nr = 0.1-5.0),布朗运动参数(Nb = 0.1,1.0)和热泳参数(Nt = 0.1,1.0)对纳米流体的流动和传热进行了研究。结果-发现瑞利和刘易斯数的高值导致纳米粒子分布的均质化。对于较高的Nt和Nb值,加热更为重要,并且腔体平均温度会升高。独创性/价值-这项工作的独创性是利用布朗扩散和热泳分析开放式梯形空腔中的自然对流。

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