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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effects of slip and heat generation/absorption on MHD stagnation flow of nanofluid past a stretching/shrinking surface with convective boundary conditions
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Effects of slip and heat generation/absorption on MHD stagnation flow of nanofluid past a stretching/shrinking surface with convective boundary conditions

机译：滑动和生热/吸收对具有对流边界条件的纳米流体通过拉伸/收缩表面的MHD滞流的影响

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摘要

The objective of the present study is to analyze the effects of velocity slip and heat generation/absorption on magnetohydrodynamic (MHD) stagnation-point flow and heat transfer over a stretching/shrinking surface, with convective boundary conditions, in the presence of nanoparticle fractions. The effects of Brownian motion and thermophoresis are also considered. The velocity, temperature and nanoparticle concentration profiles are analyzed with respect to the involved parameters, namely, slip parameter (δ), magnetic parameter (M), source/sink parameter (λ), Brownian motion parameter (Nb), thermophoresis parameter (Nt), Prandtl number (Pr), Lewis number (Le), Biot number (γ) and ratio of the rate constants of stretching/shrinking velocity to the free stream velocity (α). The numerical results indicate that for the stretching sheet, the velocity at a point decreases with the increase in the values of δ and M; whereas both temperature and nanoparticle concentration increase with the increase in δ and M. It is also observed that the temperature of the fluid increases with the increase in heat source parameter (i.e. λ>0). Different from a stretching sheet, it is found that for a shrinking sheet the solutions are non-unique. A comparative study between the previously published results and the present results for a special case is found to be in good agreement.
机译：本研究的目的是分析在存在对流边界条件下，在存在纳米颗粒组分的情况下，速度滑移和生热/吸收对磁流体动力学（MHD）驻点流和在拉伸/收缩表面上的传热的影响。还考虑了布朗运动和热泳的影响。针对涉及的参数分析速度，温度和纳米粒子浓度曲线，即滑移参数（δ），磁参数（M），源/汇参数（λ），布朗运动参数（Nb），热泳参数（Nt ），Prandtl数（Pr），Lewis数（Le），Biot数（γ）以及拉伸/收缩速度与自由流速度的比率常数（α）之比。数值结果表明，对于拉伸片材，一点的速度随着δ和M值的增加而降低；然而，随着δ和M的增加，温度和纳米粒子的浓度也增加。还观察到流体的温度随着热源参数的增加而增加（即，λ> 0）。与拉伸片材不同，发现对于收缩片材而言溶液是不唯一的。以前发表的结果与当前的特殊情况的结果之间的比较研究发现非常吻合。

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