热辐射和温度振荡作用下的非定常碳纳米管纳米流体运动

IF 2.7 Q3 NANOSCIENCE & NANOTECHNOLOGY Journal of Nanofluids Pub Date : 2023-06-01 DOI:10.1166/jon.2023.2019
C. Sridevi, A. Sailakumari
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引用次数: 0

摘要

本文讨论了含碳纳米管(SWCNTs和MWCNTs)的纳米流体在热辐射和温度振荡作用下在移动的垂直圆柱体上的瞬态二维边界层层流粘性不可压缩自由对流流动。将控制边界层方程转化为无因次形式,然后用曲克尼科尔森型无条件稳定收敛隐式有限差分法求解。采用不同的参数,如Grashof数(Gr)、体积分数(Φ)、相角(ωt)和热辐射参数(N),得到了速度和温度分布以及努塞尔数和皮肤摩擦系数的数值结果。对以单壁碳纳米管和多壁碳纳米管为纳米材料的水基纳米流体和煤油基纳米流体的数值结果进行了详细的图形分析。研究发现,与含有碳纳米管的煤油基纳米流体相比,碳纳米管水基纳米流体具有更高的温度、速度和所有Gr、N、Φ和ωt的摩擦系数值。但是,煤油基CNTs纳米流体的Gr、N、Φ和ωt的努塞尔数系数值均高于水基CNTs纳米流体。
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Unsteady Carbon Nanotubes Nanofluid Flow due to a Moving Cylinder with Thermal Radiation and Temperature Oscillation Effects
This paper discusses transient two-dimensional boundary layer laminar viscous incompressible free convective flow of nanofluids containing carbon nanotubes (SWCNTs and MWCNTs) over a moving vertical cylinder in the presence of thermal radiation and temperature oscillation. The governing boundary layer equations are converted to a dimensionless form and then solved using the Crank Nicolson type’s unconditionally stable and convergent implicit finite difference method. With diverse parameters such as Grashof number (Gr), volume fraction (Φ), phase angle (ωt), and thermal radiation parameter (N), numerical results are achieved for velocity and temperature profiles along with Nusselt number and skin friction coefficients. The numerical results are analysed in detail using graphs for both water-based nanofluid and kerosene-based nanofluids with single and multi-wall carbon nanotubes as the nanomaterials. It has been found that CNTs Water-based nanofluid has higher temperatures, velocities, skin friction coefficient values for all Gr, N, Φ, and ωt when compared to kerosene-based nanofluid with CNTs. But, Kerosene-based CNTs nanofluid has a higher Nusselt number coefficient values concerning all Gr, N, Φ, and ωt than water-based CNTs nanofluid.
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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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