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Numerical study of thermal and mass enhancement in the flow of Carreau-Yasuda fluid with hybrid nanoparticles
Case Studies in Thermal Engineering ( IF 6.4 ) Pub Date : 2021-07-22 , DOI: 10.1016/j.csite.2021.101256
U. Nazir 1 , Nidal H. Abu-Hamdeh 2 , M. Nawaz 1 , Sayer Obaid Alharbi 3 , Waqar Khan 4
Affiliation  

Shear rate-pendent viscosity model has been used for the prediction of behaviour regarding shear thinning. Carreau-Yasuda model is one of them which predict shear thinning behaviour. The dynamics of fluid flow models are predicted numerically using shear rate-dependent model associated with Carreau and Yasuda. The two-dimensional heat transfer enhancement via hybrid nano-structures is investigated numerically. The outcomes of pure Carreau-Yasuda and Carreau-Yasuda fluid with nano-structures are compared. The FEM tool is used for numerical simulations and outcomes are recorded in the form of graphs and numerical data. It is observed during numerical experiments that wall shear stress in both types of fluids is proportional to the intensity of the magnetic field. Therefore, the rate of heat transport is decreased when Ohmic dissipations increase the temperature. of fluid. However, this decrease in heat transfer rate is more prominent in hybrid nanofluid relative to the mono nanofluid. The behaviour of generative chemical reactions on the concentration profile is opposite to the behaviour of destructive chemical reactions. It is noted that the motion of fluid has an increasing tendency when the Weissenberg number is increased. This impact of the movement of solid boundary in hybrid nanofluid is faster than the diffusion of wall movement in a mono nanofluid. The Rayleigh convection parameter tends to slow down the motion of molecules of mono nano and hybrid nanofluid. Shear stress increases when the intensity of the magnetic field is increased. This wall shear stress for MHD fluid is greater than that for fluid in absence of a magnetic field. The impact of change of intensity of magnetic field on temperature profiles. It is observed that magnetic force is a retarding force and causes retardation to flow. It means that convective transport of heat energy is compromised when the intensity of the magnetic field is increased.



中文翻译:

具有混合纳米粒子的 Carreau-Yasuda 流体流动中热和质量增强的数值研究

剪切速率悬垂粘度模型已用于预测有关剪切稀化的行为。Carreau-Yasuda 模型是其中一种预测剪切稀化行为的模型。流体流动模型的动力学使用与 Carreau 和 Yasuda 相关的剪切速率相关模型进行数值预测。数值研究了通过混合纳米结构增强二维传热。比较了纯 Carreau-Yasuda 和具有纳米结构的 Carreau-Yasuda 流体的结果。FEM 工具用于数值模拟,结果以图表和数值数据的形式记录。在数值实验中观察到,两种流体中的壁面剪应力都与磁场强度成正比。所以,当欧姆耗散增加温度时,热传输速率降低。的流体。然而,与单纳米流体相比,混合纳米流体中传热速率的这种降低更为突出。浓度分布上的生成化学反应的行为与破坏性化学反应的行为相反。值得注意的是,随着魏森伯格数的增加,流体的运动有增加的趋势。混合纳米流体中固体边界运动的这种影响比单纳米流体中壁运动的扩散更快。瑞利对流参数趋向于减慢单纳米和混合纳米流体分子的运动。当磁场强度增加时,剪切应力增加。MHD 流体的壁面剪切应力大于没有磁场的流体的壁面剪切应力。磁场强度变化对温度剖面的影响。据观察,磁力是一种阻滞力并导致阻滞流动。这意味着当磁场强度增加时,热能的对流传输会受到影响。

更新日期:2021-07-24
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