旋转Jeffrey纳米流体饱和多孔介质中的电转换:自由-自由、刚性-自由、刚-刚性边界

IF 2.7 Q3 NANOSCIENCE & NANOTECHNOLOGY
J. Devi, Veena Sharma, Mohini Kapalta
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引用次数: 0

摘要

采用线性稳定性分析方法研究了旋转和边界对流变纳米流体层中对流不稳定性的影响,该流变纳米流体被包含交流电场(垂直)的多孔介质加热至饱和以下。流变纳米流体的稳态对流稳定性通常是利用Buongiorno模型和Jeffrey模型建立的。用于纳米流体的Buongiorno模型结合了热泳和布朗运动的影响。使用法向模式技术,对无应力边界的耦合微分方程组进行了解析求解,并对顶部自由、底部刚性和刚性-刚性边界表面使用Galerkin型加权残差法(GWRM)进行了数值求解。对于三种不同的边界条件组合,用图形表示了稳态热瑞利数的数值计算值。考虑旋转参数的泰勒数、杰弗里参数和纳米流体路易斯数延迟了稳定对流的开始,而电场和浓度瑞利数使三组边界的系统不稳定。底部/顶部较重的纳米流体被发现或多或少是稳定的。刚性-刚性边界以比无应力和无刚性边界更显著的方式增强稳定性。文中还导出了不发生超稳定性的条件。这项研究在许多冶金过程中具有重要意义,包括megma流、深对流烟囱、聚合物溶液、微流体装置和微循环系统中的血液流动。这篇论文和早先发表的著作非常吻合。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Electroconvection in Rotating Jeffrey Nanofluid Saturating Porous Medium: Free–Free, Rigid-Free, Rigid–Rigid Boundaries
The impact of rotation and the boundaries on the initiation of convective instability in a rheological nanofluid layer heated beneath saturated by a porous media with the inclusion of an AC electric field (vertical) is studied employing linear stability analysis. The stationary convective stability of rheological nanofluid is customarily established utilizing Buongiorno model for nanoparticles and Jeffrey model for rheological behavior of regular fluid. The Buongiorno model deployed for nanofluids incorporates the influence of thermophoresis and Brownian motion. Using the normal mode technique, the set of coupled differential equations is solved analytically for both stress-free boudaries and numerically by using the Galerkin-type Weighted Residual Method (GWRM) for top-free, bottom-rigid and rigid–rigid bounding surfaces. The numerical computed values of stationary thermal Rayleigh number are presented graphically for three distinct combinations of boundary conditions. The Taylor number accounting for rotation parameter, Jeffrey parameter, and nanofluid Lewis number delay the start of stationary convection, whereas electric field and concentration Rayleigh number destabilize a system for three groups of boundaries. The bottom-/top-heavy nanofluids are found to be more/less stable. Rigid–rigid boundaries augment the stability in a more pronounced manner than that of the stress-free and rigid-free boundaries. The conditions for non-occurrence of over stability are also derived. This study is of great significance in many metallurgical processes including megma flow, deep convective chimneys, polymer solutions, microfluidic devices and blood flow in micro circulatory systems. An excellent coincidence is found admist present paper and the earlier published work.
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来源期刊
Journal of Nanofluids
Journal of Nanofluids NANOSCIENCE & NANOTECHNOLOGY-
自引率
14.60%
发文量
89
期刊介绍: Journal of Nanofluids (JON) is an international multidisciplinary peer-reviewed journal covering a wide range of research topics in the field of nanofluids and fluid science. It is an ideal and unique reference source for scientists and engineers working in this important and emerging research field of science, engineering and technology. The journal publishes full research papers, review articles with author''s photo and short biography, and communications of important new findings encompassing the fundamental and applied research in all aspects of science and engineering of nanofluids and fluid science related developing technologies.
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