Wavy falling film of nanofluid over a vertical plate considering nanoparticle migration

Wavy falling film of nanofluid over a vertical plate considering nanoparticle migration
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考虑纳米颗粒迁移的垂直板上纳米流体的波状降膜

DOI:
10.1016/j.ijheatmasstransfer.2019.118895
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发表时间:
2020
影响因子:
5.2
通讯作者:
Peng Jie
Peng Jie
中科院分区:
工程技术2区
文献类型:
--
作者:
Cheng Ze;Peng Jie

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在这项调查中,波浪形的降膜流动在垂直平板上的纳米颗粒迁移的影响被认为是由积分边界层(IBL)方法研究的膜流动动力学。布朗运动和热泳都包括在内。平均传热速率进行比较,不同的纳米粒子分数和不同比例的布朗扩散和热泳扩散。冷却和加热问题进行了讨论。根据不同的温度边界条件控制颗粒的迁移方向,这可能导致流动动力学中的相反作用。结果表明,颗粒迁移通过影响粘度和密度的分布,对薄膜上类孤波的强度起着重要的调节作用。颗粒迁移通过影响导热系数的分布和调节平均膜厚来影响膜的传热。
In this investigation, the wavy falling film flow over a vertical plate is studied with the effects of nanoparticle migration on the film flow dynamics being considered by the integral-boundary-layer (IBL) method. Both the Brownian motion and thermophoresis are included. The average heat transfer rate is compared for different nanoparticle fractions and different ratios of Brownian diffusion and thermophoretic diffusion. Both cooling and heating problems are discussed. The particle migration direction, which may lead to the opposite role in the flow dynamics, is controlled according to different temperature boundary conditions. The results show that particle migration plays an important role in regulating the intensity of solitary-like waves on the film by causing the distribution of viscosity and density. The particle migration affects the film heat transfer by causing the distribution of thermal conductivity and regulating the average thickness.
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