给定表面温度/热流面的CeO2-ZnO/水混合纳米流体双向流动的熵行为

IF 1.7 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Muhammad Faisal, Iftikhar Ahmad, Abdur Rashid
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引用次数: 0

摘要

目的研究含热辐射和熵产的混合纳米流体在非定常拉伸装置上的双向磁化流动。砖状纳米颗粒(氧化锌和二氧化铈)悬浮在水中,作为基液,观察混合材料的性能。采用麦克斯韦导热系数关系将混合混合物的热物理性质与主体液体联系起来。此外,热源/汇项被纳入能量平衡,以增强调查的影响。采用规定表面温度(PST)和规定热流密度(PHF)条件考察了混合纳米流体的热性能。设计/方法/方法将笛卡尔型输运方程转化为常微分方程,并利用Keller-Box法(KBM)求解转化后的系统。通过后处理直观地表示速度分布、热分布、表面摩擦系数、Bejan数、Nusselt数和熵生成函数对相关参数的变化。发现随着温差和辐射参数的增大,产生的熵增大。Bejan数最初下降,但随后随着不稳定性和Hartmann数的较高估计而改善。总的来说,对于所涉及的约束条件的不同估计,系统的热性能是针对PST情景而不是PHF情景开发的。原创性/价值据作者所知,目前还没有研究报告解释了CeO2-ZnO/水混合纳米流体在规定的热方面(PST和PHF)和熵产生的综合作用下的双向流动。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Entropic behavior in bidirectional flow of CeO2-ZnO/water hybrid nanofluid with prescribed surface temperature/heat flux aspects
Purpose The present study aims to encompass the bidirectional magnetized flowing of a hybrid-nanofluid over an unsteady stretching device with the inclusion of thermal radiation and entropy generation. Brick-shaped nanoparticles (zinc-oxide and ceria) are suspended in water, serving as the base-fluid to observe the performance of the hybrid mixture. The Maxwell thermal conductivity relation is employed to link the thermophysical attributes of the hybrid mixture with the host liquid. Additionally, a heat source/sink term is incorporated in the energy balance to enhance the impact of the investigation. Both prescribed-surface-temperature (PST) and prescribed-heat-flux (PHF) conditions are applied to inspect the thermal performance of the hybrid nanofluid. Design/methodology/approach The transport equations in Cartesian configuration are transformed into ordinary differential equations (ODEs), and an efficient method, namely the Keller-Box method (KBM), is utilized to solve the transformed system. Postprocessing is conducted to visually represent the velocity profile, thermal distribution, skin-friction coefficients, Bejan number, Nusselt number and entropy generation function against the variations of the involved parameters. Findings It is observed that more entropy is generated due to the increases in temperature difference and radiation parameters. The Bejan number initially declines but then improves with higher estimations of unsteadiness and Hartmann number. Overall, the thermal performance of the system is developed for the PST scenario than the PHF scenario for different estimations of the involved constraints. Originality/value To the best of the authors' knowledge, no investigation has been reported yet that explains the bidirectional flow of a CeO2-ZnO/water hybrid nanofluid with the combined effects of prescribed thermal aspects (PST and PHF) and entropy generation.
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来源期刊
CiteScore
3.70
自引率
5.00%
发文量
60
期刊介绍: Multidiscipline Modeling in Materials and Structures is published by Emerald Group Publishing Limited from 2010
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