具有局部热非平衡效应的牛顿饱和纳米液体多孔壳的自然对流

IF 2.7 Q3 NANOSCIENCE & NANOTECHNOLOGY
C. Siddabasappa, K. Aishwarya, Babitha
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引用次数: 0

摘要

采用局部热非平衡模型,数值分析了牛顿饱和纳米液体多孔方框内的浮力驱动对流和换热特性。一个围场的水平壁面被认为是自由-自由和绝热的,垂直壁面被认为是自由-自由等温边界。本文采用二阶精度的中心有限差分格式求解了无量纲控制方程,其结果与前人的研究工作基本一致。分析了各种参数对流线和等温线的影响,并用图形表示。达西数、热瑞利数和导热系数比的影响使液体的流动速度减慢。温度分布在侧壁处最大,减少了热量的传递。溶质瑞利数和液-颗粒相的相间传递系数则相反。当相间传热系数较大时,液体-固体和液体-颗粒被称为处于局部热平衡相。换热量随两相间换热系数和两相导热系数比值的增大而增大。根据研究的具体情况,可以得到局部热平衡情况的结果。局部热平衡状态下的换热量最大,比局部热平衡状态下的换热量提高0.09%。与低孔隙率介质相比,稀疏多孔介质中的传热量减少了0.74%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Natural Convection in a Newtonian Nanoliquid-Saturated Porous Enclosure with Local Thermal Non-Equilibrium Effect
Buoyancy-driven convective flow and heat transfer characteristics in a Newtonian nanoliquid-saturated porous square enclosure are analyzed numerically using a local thermal non-equilibrium model. An enclosure’s horizontal walls are considered free–free and adiabatic, and the vertical walls are free–free isothermal boundaries. The dimensionless governing equations are solved using a central finite difference scheme with second-degree accuracy, and the results are in satisfactory agreement with the earlier works. The impact of various parameters on streamlines and isotherms is analyzed and depicted graphically. The effect of Darcy number, thermal Rayleigh number, and the ratio of thermal conductivities slow down the liquid flow. The temperature distribution is maximum at sidewalls and diminishes the amount of heat transport. The opposite phenomenon is observed for the solute Rayleigh number and interphase transfer coefficient of liquid-particle phases. For large values of interphase heat transfer coefficients, liquid-solid and liquid-particle are said to be in the local thermal equilibrium phase. The amount of heat transfer increases with an increasing interphase heat transfer coefficient and the ratio of the phases’ thermal conductivities. Results of local thermal equilibrium situation can be obtained as the particular case of the study. The amount of heat transfer is maximum in the local thermal non-equilibrium situation, and enhanced by 0.09% compared with the local thermal equilibrium situation. Heat transport is 0.74% less in the sparsely packed porous medium compared with the low-porosity medium.
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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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