Unsteady boundary layer flow of a nanofluid over a stretching sheet with variable fluid properties in the presence of thermal radiation

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• 作者：Mitiku Daba ; P. Devaraj
• 关键词：unsteady boundary layer ; nanofluid ; Brownian motion ; Keller ; box method ; stretching sheet ; thermophoresis ; thermal radiation
• 刊名：Thermophysics and Aeromechanics
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：23
• 期：3
• 页码：403-413
• 全文大小：1,121 KB
• 刊物主题：Thermodynamics;
• 出版者：Springer US
• ISSN：1531-8699
• 卷排序：23

文摘

In this paper, we investigated numerically an unsteady boundary layer flow of a nanofluid over a stretching sheet in the presence of thermal radiation with variable fluid properties. Using a set of suitable similarity transformations, the governing partial differential equations are reduced into a set of nonlinear ordinary differential equations. System of the nonlinear ordinary differential equations are then solved by the Keller-box method. The physical parameters taken into consideration for the present study are: Prandtl number Pr, Lewis number Le, Brownian motion parameter N_b, thermophoresis parameter N_t, radiation parameter N_r, unsteady parameter M. In addition to these parameters, two more new parameters namely variable thermophoretic diffusion coefficient parameter e and variable Brownian motion diffusion coefficient parameter β have been introduced in the present study. Effects of these parameters on temperature, volume fraction of the nanoparticles, surface heat and mass transfer rates are presented graphically and discussed briefly. To validate our method, we have compared the present results with some previously reported results in the literature. The results are found to be in a very good agreement.