Numerical Investigation of Hybrid Nanofluid Natural Convection and Entropy Generation in a Corrugated Enclosure with an Inner Conducting Block

IF 2.7 Q3 NANOSCIENCE & NANOTECHNOLOGY
Mandira Samadder, R. K. Ray
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Abstract

Current work deals with a numerical analysis of convective heat transfer and entropy generation inside a rectangular cavity with a corrugated bottom filled with MoS2–SiO2-water hybrid nanofluid. Here, a conducting solid body is attached to the top wall, and discrete heaters are attached to the bottom wall of the cavity. The numerical solutions of the governing equations are derived utilizing a higher-order compact (HOC) finite difference scheme and validated with the existing computational and experimental results. Present numerical results are then studied in detail, emphasizing isotherms, streamlines, and local entropy generation with respect to specific parameters like Rayleigh number (103 ≤ Ra ≤ 106), the volume percentage of nanoparticles (0% ≤ Φ ≤ 4%), the thermal conductivity of solid body (1.95 ≤ ks ≤ 16.00) as well as the aspect ratio of heater length (AR = 0.2, 0.4, 0.6, 0.8). The impacts of key factors on the Bejan number, average Nusselt number, and overall entropy generation are also investigated. The results show that an increase in the thermal conductivity of the solid body from 1.95 to 16.00 increases the average Nusselt number and total entropy generation by 9.17% and 40.07%, respectively, for AR = 0.2, Ra = 106, and Φ = 4%. In addition, the average Nusselt number and total entropy generation decrease by 59.11% and 61.99%, respectively, for ks = 16.00, Ra = 106, and Φ = 4% when the aspect ratio of heater length increases to 0.8.
带内导电块的波纹围护结构中混合纳米流体自然对流和熵生成的数值研究
目前的研究工作涉及对充满 MoS2-SiO2 水混合纳米流体的底部呈波纹状的矩形空腔内的对流传热和熵生成进行数值分析。空腔顶壁附有导电固体,底壁附有离散加热器。利用高阶紧凑(HOC)有限差分方案推导出了控制方程的数值解,并与现有的计算和实验结果进行了验证。然后详细研究了目前的数值结果,强调了等温线、流线和局部熵的产生与特定参数的关系,如瑞利数(103 ≤ Ra ≤ 106)、纳米颗粒的体积百分比(0% ≤ Φ ≤ 4%)、固体的热导率(1.95 ≤ ks ≤ 16.00)以及加热器长度的长宽比(AR = 0.2、0.4、0.6、0.8)。还研究了关键因素对贝扬数、平均努塞尔特数和总熵生成的影响。结果表明,当 AR = 0.2、Ra = 106 和 Φ = 4% 时,固体的导热系数从 1.95 增加到 16.00,平均努塞尔特数和总熵增量分别增加了 9.17% 和 40.07%。此外,当加热器长度的纵横比增加到 0.8 时,当 ks = 16.00、Ra = 106 和 Φ = 4% 时,平均努塞尔特数和总熵生成量分别减少了 59.11% 和 61.99%。
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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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