An analysis has been carried out to study the effect of variable fluid properties on MHD mixed convection flow of second-grade fluid flowing along an infinite stretching sheet with convective boundary condition. The fluid is placed on an infinite heated elastic surface with linear stretching rate and a vertical velocity component due to suction at the sheet is considered. The combined effects of inertia, viscous, visco-elastic, and magnetic forces are analyzed. The basic equations governing the flow, heat transfer, and mass transfer are reduced to a set of nonlinear ordinary differential equations by using appropriate similarity transformations for velocity, temperature, and concentration. The fluid viscosity is assumed to vary as an inverse linear function of temperature, whereas the thermal conductivity as a linear function of temperature. These equations are solved numerically and the results for velocity, temperature, concentration, skin friction, local Nusselt number, and local Sherwood number are discussed using flow parameters. The investigation reveals that Joule heating and viscous dissipation enhance the temperature profile, and there are considerable effects in the presence of variable fluid properties. Comparison with previous studies shows good agreement as a special case of the problem.

中文翻译：

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对流边界条件对线性加热拉伸片上可变流体性质对二级流体MHD混合对流的影响

已经进行了分析以研究可变流体特性对沿具有对流边界条件的无限大拉伸板流动的二级流体的MHD混合对流的影响。将流体以线性拉伸速率放置在无限加热的弹性表面上，并考虑由于在片材上的吸力而产生的垂直速度分量。分析了惯性，粘性，粘弹性和磁力的综合作用。通过对速度，温度和浓度进行适当的相似变换，将控制流动，传热和传质的基本方程简化为一组非线性常微分方程。假定流体粘度随温度成反线性函数而变化，而导热系数随温度成线性关系而变化。对这些方程进行数值求解，并使用流量参数讨论了速度，温度，浓度，皮肤摩擦，局部努塞尔数和局部舍伍德数的结果。研究表明，焦耳加热和粘性耗散会提高温度分布，并且在存在可变流体特性的情况下会产生相当大的影响。与以前的研究比较表明，该问题的特殊情况具有很好的一致性。