MHD mixed convective stagnation-point flow of Eyring-Powell nanofluid over stretching cylinder with thermal slip conditions

Abstract

The optimal design of heating and cooling systems must take into account heat radiation which is a non-linear process. In this study, the mixed convection in a radiative magnetohydrodynamic Eyring-Powell copper-water nanofluid over a stretching cylinder was investigated. The energy balance is modeled, taking into account the non-linear thermal radiation and a thermal slip condition. The effects of the embedded flow parameters on the fluid properties, as well as on the skin friction coefficient and heat transfer rate, are analyzed. Unlike in many existing studies, the recent spectral quasi-linearization method is used to solve the coupled nonlinear boundary-value problem. The computational result shows that increasing the nanoparticle volume fraction, thermal radiation parameter and heat generation parameter enhances temperature profile. We found that the velocity slip parameter and the fluid material parameter enhance the skin friction. A comparison of the current numerical results with existing literature for some limiting cases shows excellent agreement.

摘要

供热冷却系统的优化设计必须考虑非线性过程的热辐射。 本文研究了铜-水纳米流体在伸缩圆 筒上的Eyring-Powell 磁热辐射的混合对流动力学。 考虑非线性热辐射和热滑移条件, 建立了能量守 衡模型, 分析了表面摩擦系数和换热速率等流动参数对流体特性的影响。不采用现有的研究方法, 应 用最近的谱准线性化方法求解耦合非线性边界值问题。 计算结果表明, 增大纳米粒子的体积分数、热 辐射参数和热源参数可增强温度分布。 速度滑移参数和流体材料参数增大了表面摩擦力。 对比分析了 极限情况下的数值结果和文献结果, 结果表明: 采用本文研究方法计算结果达到同等精度。