Purpose

This study aims to investigate the micropolar fluid flow through a moving flat plate containing CoFe₂O₄-TiO₂ hybrid nanoparticles with the substantial influence of thermophoresis particle deposition and viscous dissipation.

Design/methodology/approach

The partial differential equations are converted to the similarity equations of a particular form through the similarity variables. Numerical outcomes are computed by applying the built-in program bvp4c in MATLAB. The process of flow, heat and mass transfers phenomena are examined for several physical aspects such as the hybrid nanoparticles, micropolar parameter, the thermophoresis particle deposition and the viscous dissipation.

Findings

The friction factor, heat and mass transfer rates are higher with an increment of 1.4%, 2.2% and 1.4%, respectively, in the presence of the hybrid nanoparticles (with 2% volume fraction). However, they are declined because of the rise of the micropolar parameter. The imposition of viscous dissipation reduces the heat transfer rate, significantly. Meanwhile, thermophoresis particle deposition boosts the mass transfer. Multiple solutions are developed for a certain range of physical parameters. Lastly, the first solution is shown to be stable and reliable physically.

Originality/value

As far as the authors have concerned, no work on thermophoresis particle deposition of hybrid nanoparticles on micropolar flow through a moving flat plate with viscous dissipation effect has been reported in the literature. Most importantly, this current study reported the stability analysis of the non-unique solutions and, therefore, fills the gap of the study and contributes to new outcomes in this particular problem.

中文翻译：

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CoFe2O4-TiO2杂化纳米粒子在微极流上的热泳粒子沉积通过具有粘性耗散效应的移动平板

目的

_{本研究旨在研究通过含有CoFe 2} O ₄ -TiO ₂杂化纳米粒子的移动平板的微极流体流动，其中热泳粒子沉积和粘性耗散具有显着影响。

设计/方法/方法

偏微分方程通过相似变量转换为特定形式的相似方程。通过应用 MATLAB 中的内置程序 bvp4c 计算数值结果。研究了流动、传热和传质现象的几个物理方面，例如混合纳米粒子、微极参数、热泳粒子沉积和粘性耗散。

发现

在混合纳米粒子（体积分数为 2%）存在下，摩擦系数、传热和传质速率分别增加 1.4%、2.2% 和 1.4%。然而，由于微极参数的上升，它们下降了。粘性耗散的施加显着降低了传热率。同时，热泳粒子沉积促进了传质。针对一定范围的物理参数开发了多种解决方案。最后，第一个解决方案在物理上被证明是稳定和可靠的。

原创性/价值

就作者而言，文献中没有关于混合纳米粒子热泳粒子沉积在通过具有粘性耗散效应的移动平板的微极流上的工作的报道。最重要的是，目前的这项研究报告了非唯一解的稳定性分析，因此填补了研究的空白，并为这一特定问题的新结果做出了贡献。