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Effect of convective boundary condition on unsteady flow of CNT-H2O nanofluid towards a stagnation-point on a shrinking/expanding flat sheet
Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering ( IF 2.4 ) Pub Date : 2021-11-22 , DOI: 10.1177/09544089211054626
Sohita Rajput 1 , Amit Kumar Pandey 1 , Krishnendu Bhattacharyya 1 , Ioan Pop 2
Affiliation  

A model study of unsteady stagnation-point flow of most important nanoparticles, that is, carbon nanotubes suspended nanofluid towards shrinking/expanding sheet with convective boundary condition is demonstrated. Two types of carbon nanotubes, namely, single-wall and multi-wall nanotubes are carefully considered. Numerical solutions of converted equations from governing equation of the problem are obtained and those are graphically presented. Similar to without carbon nanotubes case, dual and unique solutions in specific ranges of velocity ratio parameter are achieved. Analysis disclosures that the condition on range where dual solutions exist is unaltered with solid-volume fraction and type of carbon nanotubes. The surface drag-force and heat transfer rate from wall are larger for single-walled carbon nanotubes nanofluid than multi-walled carbon nanotubes nanofluid. An increment in the parameter related to convective boundary condition generates high rate of heat transfer. After stability analysis, it is identified that in case of dual solutions, upper branch is stable and lower branch is unstable, while unique solution is always stable.



中文翻译:

对流边界条件对 CNT-H2O 纳米流体向收缩/膨胀平板上的停滞点的非定常流动的影响

展示了对最重要的纳米粒子的非定常驻点流动的模型研究,即碳纳米管悬浮在具有对流边界条件的收缩/膨胀片上的纳米流体。仔细考虑了两种类型的碳纳米管,即单壁和多壁纳米管。从问题的控制方程得到转换方程的数值解,并用图形表示。类似于没有碳纳米管的情况,在特定的速度比参数范围内实现了双重和独特的解决方案。分析表明,存在双溶液的范围条件不随碳纳米管的固体体积分数和类型而改变。单壁碳纳米管纳米流体比多壁碳纳米管纳米流体的壁面阻力和传热速率更大。与对流边界条件相关的参数增加会产生高传热率。经过稳定性分析,确定在对偶解的情况下,上分支稳定,下分支不稳定,而唯一解总是稳定的。

更新日期:2021-11-22
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