Linear variations in conductivity and viscosity as particles’ basic profile for convective instability in nanofluids under various boundary conditions

IF 1.9 3区 工程技术 Q3 MECHANICS
Jyoti Sharma
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引用次数: 0

Abstract

The present study investigates thermal sensitivity of a horizontal nanofluid layer which is subjected to conductivity and viscosity variations as linear functions of volume fraction of particles. A weak heterogeneous characteristic of the fluid is considered i.e. variations freeze as the basic profile of particles in the system. Further, the study undertakes various boundary conditions on the layer to analyse the convection process such as zero particle flux, equal, top and bottom heavy distribution of volume fraction of particles. The expression of Rayleigh number for nanofluid is found to be increased significantly due to conductivity and viscosity variation effects and has negligible impact in decreasing/increasing its value due to other nanofluid variables. Thus, a substantial enhancement in the stability of the system is established except for zero flux case where overall effects due to the presence of particles become almost negligible. The properties of base fluid and particles show conflicting roles in deciding the thermal sensitivity of the layer.

Abstract Image

Abstract Image

在各种边界条件下,纳米流体对流不稳定性中作为颗粒基本轮廓的电导率和粘度的线性变化
本研究探讨了水平纳米流体层的热敏感性,该流体层的传导率和粘度变化是颗粒体积分数的线性函数。研究考虑了流体的弱异质特性,即系统中颗粒基本轮廓的冻结变化。此外,研究还采用了层上的各种边界条件来分析对流过程,如颗粒流量为零、颗粒体积分数的等量、顶部和底部重分布。研究发现,由于电导率和粘度变化的影响,纳米流体的瑞利数会显著增加,而其他纳米流体变量对其值的减小/增大影响微乎其微。因此,除了在零流量情况下,由于颗粒的存在而产生的整体影响几乎可以忽略不计之外,系统的稳定性得到了大幅提高。基础流体和颗粒的特性在决定层的热敏性方面表现出相互冲突的作用。
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来源期刊
Meccanica
Meccanica 物理-力学
CiteScore
4.70
自引率
3.70%
发文量
151
审稿时长
7 months
期刊介绍: Meccanica focuses on the methodological framework shared by mechanical scientists when addressing theoretical or applied problems. Original papers address various aspects of mechanical and mathematical modeling, of solution, as well as of analysis of system behavior. The journal explores fundamental and applications issues in established areas of mechanics research as well as in emerging fields; contemporary research on general mechanics, solid and structural mechanics, fluid mechanics, and mechanics of machines; interdisciplinary fields between mechanics and other mathematical and engineering sciences; interaction of mechanics with dynamical systems, advanced materials, control and computation; electromechanics; biomechanics. Articles include full length papers; topical overviews; brief notes; discussions and comments on published papers; book reviews; and an international calendar of conferences. Meccanica, the official journal of the Italian Association of Theoretical and Applied Mechanics, was established in 1966.
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