利用布昂奥尔诺双组分模型对充满多孔介质且饱和磁性纳米流体的矩形外壳中的自然对流进行数值模拟

IF 1.6 4区 工程技术 Q3 ENGINEERING, CHEMICAL
K. Venkatadri, K. V. Narasimha Murthy, Tasveer A. Bég, O. Anwar Bég, Sireetorn Kuharat
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引用次数: 0

摘要

在研究新兴的基于纳米流体的磁性燃料电池和混合直接吸收式太阳能集热器的过程中,我们介绍了在横向静磁场作用下,在一个含有饱和磁化纳米流体的多孔介质的垂直围墙内进行的浮力驱动流动的数值研究。该围墙具有绝热侧壁和垂直热缝,可确保上下边界壁上的低温保持一致。制度的侧壁是绝热的,热缝位于这些侧壁的中心位置。采用有限差分法(FDM)对传输方程进行无量纲涡流-流函数(VSF)变换。相关参数对等温线、流线、等浓度以及平均努塞尔特数和舍伍德数的影响可通过等高线图和曲线图直观显示。达西数值的增加往往会放大等温线的幅度。另一方面,较高的哈特曼(磁)数值会导致局部努塞尔特数曲线的减小,但不会显著改变局部舍伍德数。通过达西数模拟的多孔介质渗透性对流线、热等值线和等浓度有很大影响。降低达西数会抑制局部的努塞尔特数和舍伍德数,而提高雷利数则会增强它们。增加 Buongiorno 纳米级布朗运动参数可提高围护结构两冷壁的局部努塞尔特数和舍伍德数。这些模拟对纳米材料先进加工系统以及利用电磁和液体燃料技术的混合燃料电池中涉及导电纳米流体的围护结构流动有了更深入的了解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical simulation of natural convection in a rectangular enclosure filled with porous medium saturated with magnetic nanofluid using Buongiorno's two-component model

Motivated by studying emerging nanofluid-based magnetic fuel cells and hybrid direct absorber solar collectors, a numerical study is presented for buoyancy-driven flow in a vertical enclosure containing a porous medium saturated with magnetized nanofluid flow under a transverse static magnetic field. The enclosure features adiabatic side walls and vertical heat slits, ensuring consistent cold temperatures on the lower and upper bounded walls. The side walls of the regime are insulated, and the hot slits are centrally located on these walls. The finite difference method (FDM) is applied to employ the transformed dimensionless vorticity–stream function (VSF) formulation of the transport equations. The impact of pertinent parameters on isotherm, streamline, iso-concentration, and average Nusselt and Sherwood numbers are visualized with contour plots and graphs. Increasing Darcy number values tend to amplify the isotherm magnitudes. Higher Hartmann (magnetic) number values, on the other hand, lead to a reduction in local Nusselt number profiles but do not significantly modify the local Sherwood number. The porous medium permeability, as simulated via the Darcy number, has a strong impact on streamlines, thermal contours, and iso-concentrations. A reduction in Darcy's number suppresses local Nusselt and Sherwood numbers, whereas an elevation in Rayleigh's number enhances them. Increasing the Buongiorno nanoscale Brownian motion parameter enhances local Nusselt and Sherwood numbers at both cold walls of the enclosure. The simulations provide a deeper insight into enclosure flows involving electrically conducting nanofluids in advanced processing systems for nanomaterials and hybrid fuel cells utilizing electromagnetic and liquid fuel technologies.

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来源期刊
Canadian Journal of Chemical Engineering
Canadian Journal of Chemical Engineering 工程技术-工程:化工
CiteScore
3.60
自引率
14.30%
发文量
448
审稿时长
3.2 months
期刊介绍: The Canadian Journal of Chemical Engineering (CJChE) publishes original research articles, new theoretical interpretation or experimental findings and critical reviews in the science or industrial practice of chemical and biochemical processes. Preference is given to papers having a clearly indicated scope and applicability in any of the following areas: Fluid mechanics, heat and mass transfer, multiphase flows, separations processes, thermodynamics, process systems engineering, reactors and reaction kinetics, catalysis, interfacial phenomena, electrochemical phenomena, bioengineering, minerals processing and natural products and environmental and energy engineering. Papers that merely describe or present a conventional or routine analysis of existing processes will not be considered.
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