Activation energy and binary chemical reaction effects in mixed convective nanofluid flow with convective boundary conditions
Activation energy and binary chemical reaction effects in mixed convective nanofluid flow with convective boundary conditions
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DOI：
10.1016/j.jcde.2018.07.002
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发表时间：
2019-04-01
影响因子：
4.9
通讯作者：
Mondal, Hiranmoy
中科院分区：
文献类型：
--
作者：
Dhlamini, Mlamuli;Kameswaran, Peri K.;Mondal, Hiranmoy
在本文中，我们提出了无限长度边界上非稳态混合对流中活化能和二元化学反应的综合效应的理论研究。目前的研究综合了布朗运动、热泳和粘性耗散对流体速度、流体温度和化学物质浓度的影响。使用谱拟线性化方法对方程进行高精度数值求解。布朗运动被认为是质量被传输出边界层的主要过程。热泳参数的影响似乎与预期的规范相反。我们期望热泳力将质量“推”离表面，从而降低边界层中的浓度，然而，随着热泳参数的增加，边界层中化学物质的浓度增加。使用无限长度的加热板增加了边界层中化学物质的浓度。对于浸没在流体中的大的加热固体来说，比奥数增加并超过1的值，其增加的值增加了化学物质的浓度。 (C) 2018 年计算设计与工程学会。爱思唯尔的出版服务。
In this paper, we present a theoretical study of the combined effects of activation energy and binary chemical reaction in an unsteady mixed convective flow over a boundary of infinite length. The current study incorporates the influence of the Brownian motion, thermophoresis and viscous dissipation on the velocity of the fluid, temperature of the fluid and concentration of chemical species. The equations are solved numerically to a high degree of accuracy using the spectral quasilinearization method. Brownian motion was noted as the main process by which the mass is transported out of the boundary layer. The effect of thermophoretic parameter seems to be contrary to the expected norm. We expect the thermophoretic force to 'push' the mass away from the surface thereby reducing the concentration in the boundary layer, however, concentration of chemical species is seen to increase in the boundary layer with an increase in the thermophoretic parameter. The use of a heated plate of infinite length increased the concentration of chemical species in the boundary layer. The Biot number which increases and exceeds a value of one for large heated solids immersed in fluids increases the concentration of chemical species for its increasing values. (C) 2018 Society for Computational Design and Engineering. Publishing Services by Elsevier.