Purpose

The purpose of this study is to use an incompressible smoothed particle hydrodynamics (ISPH) method for simulating buoyancy ratio and magnetic field effects on double diffusive natural convection of a cooper-water nanofluid in a cavity. An open pipe is embedded inside the center of a cavity, and it is occupied by solid particles.

Design/methodology/approach

The dimensionless governing equations in Lagrangian form were solved by ISPH method. Two different thermal conditions were considered for the solid particles. The actions of the solid particles were tracked inside a cavity. The effects of Hartman parameter, Rayleigh number, nanoparticles volume fraction and Lewis number on features of heat and mass transfer and flow field were tested.

Findings

The results showed that the buoyancy ratio changes the directions of the solid particles diffusion in a cavity. The hot solid particles were raised upwards at aiding mode (N > 0) and downwards at an opposing mode (N < 0). A comparison is made with experimental and numerical simulation results, and it showed a well agreement.

Originality/value

Novel studies for the impacts of buoyancy ratio on the diffusion of solid particles embedded in an open pipe during double-diffusive flow were conducted.

中文翻译：

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纳米流体双扩散流中浮力比对管道内固体颗粒扩散的影响

目的

这项研究的目的是使用不可压缩的光滑粒子流体动力学（ISPH）方法来模拟浮力比和磁场对铜-水纳米流体在腔体内的双扩散自然对流的影响。一个开口的管子埋在空腔的中心，被固体颗粒占据。

设计/方法/方法

用ISPH方法求解拉格朗日形式的无量纲控制方程。对于固体颗粒，考虑了两种不同的热条件。固体颗粒的作用在腔体内被追踪。测试了Hartman参数，Rayleigh数，纳米颗粒体积分数和Lewis数对传热传质和流场特性的影响。

发现

结果表明，浮力比改变了固体颗粒在空腔中扩散的方向。热固体颗粒在辅助模式下（N  > 0）上升，而在相反模式下（N <0）下降。与实验和数值模拟结果进行了比较，并显示出很好的一致性。

创意/价值

进行了新颖的研究，研究了浮力比对在双扩散流中嵌入在开口管中的固体颗粒扩散的影响。