Thermal Instability Analysis of an Elastico-Viscous Nanofluid Layer

Q2 Engineering

Engineering Transactions Pub Date : 2018-08-27 DOI:10.24423/ENGTRANS.401.20180928

R. Chand, G. C. Rana, D. Puigjaner

引用次数: 0

Abstract

The purpose of this paper is to study the thermal instability analysis of an elastico-viscous nanofluid layer heated from below. The Rivlin-Ericksen type fluid model is used to describe the rheological behavior of an elastico-viscous nanofluid. The linear stability criterion for the onset of both stationary and oscillatory convection is derived by applying the normal model analysis method. The presence of nanoparticles enhances the thermal conductivity of the fluid, and the model used for the nanofluid incorporates the effects of Brownian motion and thermophoresis. The effect of the physical parameters of the system, namely the concentration Rayleigh number, Prandtl number, capacity ratio, Lewis number, and kinematic visco-elasticity coefficient, on the stability of the system is numerically investigated. In addition, sufficient conditions for the non-existence of oscillatory convection are reported.

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弹性-粘性纳米流体层的热不稳定性分析

本文的目的是研究从下加热的弹性-粘性纳米流体层的热不稳定性分析。采用Rivlin-Ericksen型流体模型来描述弹性黏性纳米流体的流变行为。应用正态模型分析方法，导出了平稳对流和振荡对流起始的线性稳定性判据。纳米颗粒的存在增强了流体的导热性，并且用于纳米流体的模型包含了布朗运动和热泳的影响。数值研究了系统的物理参数，即浓度瑞利数、普朗特数、容量比、刘易斯数和运动粘弹性系数对系统稳定性的影响。此外，还报道了振荡对流不存在的充分条件。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Engineering Transactions Engineering-Engineering (all)

CiteScore

1.40

自引率

0.00%

发文量

期刊介绍： Engineering Transactions (formerly Rozprawy Inżynierskie) is a refereed international journal founded in 1952. The journal promotes research and practice in engineering science and provides a forum for interdisciplinary publications combining mechanics with: Material science, Mechatronics, Biomechanics and Biotechnologies, Environmental science, Photonics, Information technologies, Other engineering applications. The journal publishes original papers covering a broad area of research activities including: experimental and hybrid techniques, analytical and numerical approaches. Review articles and special issues are also welcome. Following long tradition, all articles are peer reviewed and our expert referees ensure that the papers accepted for publication comply with high scientific standards. Engineering Transactions is a quarterly journal intended to be interesting and useful for the researchers and practitioners in academic and industrial communities.