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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Effect of time-dependent chemical reaction on stagnation point flow and heat transfer over a stretching sheet in a nanofluid
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Effect of time-dependent chemical reaction on stagnation point flow and heat transfer over a stretching sheet in a nanofluid

机译：时间依赖性化学反应对纳米流体中拉伸点的滞流和传热的影响

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摘要

The unsteady two-dimensional boundary layer stagnation-point flow of a nanofluid over a heated stretching sheet is investigated numerically. The unsteadiness in the flow, temperature and nanoparticle concentration fields is caused by the time-dependence of the stretching velocity, the free stream velocity and the surface temperature and concentration. The transport model employed includes the effects of Brownian motion, thermophoresis and time-dependent chemical reaction. The resulting non-linear governing equations with the associated boundary conditions are solved numerically using the shooting technique with the aid of similarity transformation. The velocity, temperature and nanoparticle volume fraction profiles, as well as the local Nusselt and Sherwood numbers, are analyzed due to the effect of the involved parameters of interest, namely the Brownian motion paramter Nb, thermophoresis parameter Nt, unsteadiness parameter S, velocity ratio parameter β, chemical reaction parameter γ, Prandtl number Pr and Lewis number Le. It is found that the mass transfer process at the solid-fluid interface is stopped for some values of Le, Nb, γ and Nt despite of the continuity of the heat transfer process for the same parameter values.
机译：数值研究了纳米流体在加热的拉伸片材上的非定常二维边界层停滞点流动。流动，温度和纳米粒子浓度场的不稳定是由拉伸速度，自由流速度以及表面温度和浓度的时间依赖性引起的。所采用的传输模型包括布朗运动，热泳和与时间有关的化学反应的影响。借助相似度变换，利用射击技术对所得的带有相关边界条件的非线性控制方程进行数值求解。由于涉及的相关参数（即布朗运动参数Nb，热泳参数Nt，不稳定参数S，速度比）的影响，分析了速度，温度和纳米粒子的体积分数分布以及局部的Nusselt和Sherwood数。参数β，化学反应参数γ，普朗特数Pr和路易斯数Le。发现对于相同的参数值，尽管传热过程是连续的，但对于Le，Nb，γ和Nt的某些值，在固-液界面处的传质过程停止了。

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