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首页> 外文期刊>Computers & mathematics with applications >Combined heat and mass transfer and thermodynamic irreversibilities in the stagnation-point flow of Casson Theological fluid over a cylinder with catalytic reactions and inside a porous medium under local thermal nonequilibrium
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Combined heat and mass transfer and thermodynamic irreversibilities in the stagnation-point flow of Casson Theological fluid over a cylinder with catalytic reactions and inside a porous medium under local thermal nonequilibrium

机译：在催化反应的圆柱体上的鲫鱼神学流体的停滞点流动和热力学不缩探的组合和热力学不缩探。在局部热非Quirquibium下的多孔介质内部

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摘要

The transport of heat and mass from the surface of a cylinder coated with a catalyst and subject to an impinging flow of a Casson rheological fluid is investigated. The cylinder features circumferentially non-uniform transpiration and is embedded inside a homogeneous porous medium. The non-equilibrium thermodynamics of the problem, including Soret and Dufour effects and local thermal non-equilibrium in the porous medium, are considered. Through the introduction of similarity variables, the governing equations are reduced to a set of non-linear ordinary differential equations which are subsequently solved numerically. This results in the prediction of hydrodynamic, temperature, concentration and entropy generation fields, as well as local and average Nusselt, Sherwood and Bejan numbers. It is shown that, for low values of the Casson parameter and thus strong non-Newtonian behaviour, the porous system has a significant tendency towards maintaining local thermal equilibrium. Furthermore, the results show a major reduction in the average Nusselt number during the transition from Newtonian to non-Newtonian fluid, while the reduction in the Sherwood number is less pronounced. It is also demonstrated that flow, thermal and mass transfer irreversibilities are significantly affected by the fluid's strengthened non-Newtonian characteristics. The physical reasons for these behaviours are discussed by exploring the influence of the Casson parameter and other pertinent factors upon the thickness of thermal and concentration boundary layers. It is noted that this study is the first systematic investigation of the stagnation-point flow of Casson fluid in cylindrical porous media. (C) 2019 Elsevier Ltd. All rights reserved.
机译：研究了热量和质量从涂有催化剂的圆柱体的表面，并受到烧伤流变流体的撞击流动的影响。圆筒的特征是周向不均匀的蒸腾，并嵌入均匀的多孔介质内。考虑了问题的非平衡热力学，包括索塞和多孔效应和多孔介质中的局部热非平衡。通过引入相似性变量，控制方程被减少到一组非线性常微分方程，随后在数值上解决。这导致预测流体动力学，温度，浓度和熵产生领域，以及局部和平均Nusselt，舍伍德和Bejan号码。结果表明，对于Casson参数的低值并因此强大的非牛顿行为，多孔系统具有保持局部热平衡的显着趋势。此外，结果表明，在从牛顿到非牛顿流体的过渡期间的平均冲突数量的重大减少，而舍伍德数量的减少则不太明显。还证明了流动，热和传质不缩探受到流体强化的非牛顿特征的显着影响。通过探讨Casson参数和其他相关因子对热浓度边界层厚度的影响来讨论这些行为的物理原因。应注意，该研究是圆柱形多孔介质中鲫鱼流体停滞点流动的第一次系统研究。 （c）2019 Elsevier Ltd.保留所有权利。

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