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Thermal diffusion and diffusion-thermo effects on mixed convection from an exponentially impermeable stretching surface

机译:热扩散和扩散热对指数不渗透拉伸表面混合对流的影响

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The objective of the present article is to investigate the Dufour (diffusion-thermo) and Soret (thermal diffusion) effects on the steady double diffusive mixed convection boundary layer flows over an impermeable exponentially stretching sheet in an exponentially moving free stream under the influence of chemically reactive species. The nonlinear partial differential equations governing the flow, temperature and species concentration fields are expressed in non-dimensional form with the help of suitable non-similar transformations. The resulting final non-dimensional set of coupled nonlinear partial differential equations is solved by using an implicit finite difference scheme in conjunction with the Newton's linearization technique. The effects of various governing parameters involved in the velocity, temperature and species concentration fields are discussed in this article. The results display that the streamwise co-ordinate ξ (non-similarity variable) profoundly influences the flow, thermal and concentration fields which reveal the accountability of non-similar solutions. Results also indicate that the Dufour number D_f decreases the heat transfer coefficient while the Soret number S_r decreases the mass transfer coefficient.
机译:本文的目的是研究在化学作用的影响下,指数移动自由流中不可渗透的指数拉伸片材上的稳态双扩散混合对流边界层流上的Dufour(扩散-热)和Soret(热扩散)效应。反应性物种。在适当的非相似变换的帮助下,控制流量,温度和物质浓度场的非线性偏微分方程以无量纲形式表示。通过使用隐式有限差分方案结合牛顿线性化技术,解决了耦合的非线性偏微分方程的最终最终无量纲集。本文讨论了涉及速度,温度和物种浓度场的各种控制参数的影响。结果表明,沿流方向的坐标ξ(非相似性变量)对流场,热场和浓度场产生了深远的影响,揭示了非相似性解决方案的责任。结果还表明,杜福尔数D_f降低了传热系数,而索勒特数S_r降低了传热系数。

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