重力调制下旋转纳米流体层的传热传质研究

IF 2.7 Q3 NANOSCIENCE & NANOTECHNOLOGY Journal of Nanofluids Pub Date : 2023-04-01 DOI:10.1166/jon.2023.1971
S. H. Manjula, P. Kiran, S. Gaikwad
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引用次数: 2

摘要

本文研究了重力调制和旋转对纳米流体水平层热不稳定性的影响。在存在调制和慢时间的情况下,利用物理变量的最小傅立叶级数表达式导出了有限振幅。在这里,我们将具有布朗运动效应的纳米流体层与热泳术结合起来。传热和传质用有限的振幅来计算,用努塞尔数来计算流体和浓度。研究发现,重力调制和旋转可以有效地调节传热传质。这种调制可以很容易地通过以正弦方式垂直摇动层来感受。对调制幅值进行了数值计算,并给出了图形。发现旋转和调制频率延迟了传热传质速率。这表明了重力调制和旋转对非旋转系统的稳定性质。对调制和未调制系统进行了比较,发现调制系统比未调制系统对稳定性问题的影响更大。同样调制的系统比未调制的系统传递更多的热量和质量。最后,我们绘制了流线和纳米粒子等温线来显示对流现象。
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Study of Heat and Mass Transfer in a Rotating Nanofluid Layer Under Gravity Modulation
In this paper we investigate the effect of gravity modulation and rotation on thermal instability in a horizontal layer of a nanofluid. Finite amplitudes have been derived using the minimal Fourier series expressions of physical variables in the presence of modulation and slow time. Here we incorporates the layer of nanofluid with effect of Brownian motion along with thermophoresis. Heat and mass transfer are evaluated in terms of finite amplitudes and calculated by Nusselt numbers for fluid and concentration. It is found that, gravity modulation and rotation can be used effectively to regulate heat and mass transfer. This modulation can be easily felt by shaking the layer vertically with sinusoidal manner. The numerical results are obtained for amplitude of modulation and presented graphically. It is found that rotation and frequency of modulation delays the rate of heat and mass transfer. This shows that a stabilizing nature of gravity modulation and rotation against a non rotating system. A comparison made between modulated and unmodulated and found that modulated system influence the stability problem than un modulated system. Similarly modulated system transfer more heat mass transfer than unmodulated case. Finally we have drawn streamlines and nanoparticle isotherms to show the convective phenomenon.
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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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