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Effect of Top Wall Configuration on Unsteady Flow and Heat Transfer Characteristics of Sinusoidal Wavy Channels
Heat Transfer Engineering ( IF 2.3 ) Pub Date : 2021-02-02 , DOI: 10.1080/01457632.2021.1875167
Sankaravarrier Harikrishnan 1 , Shaligram Tiwari 1
Affiliation  

Abstract

In the present work, three-dimensional numerical investigations are carried out to study the influence of top wall confinement on unsteady flow and heat transfer characteristics of sinusoidal wavy channels. Different channel confinements considered in the present study are channels having sinusoidal bottom wall and plane, in-phase, and out-of-phase configurations of the top wall. Computations are carried out by using open-source computational fluid dynamics package OpenFOAM. Numerical results are validated against the experimental results reported in the literature. The onset of unsteady flow and three-dimensionality in the channel has been identified by monitoring velocity at a point in the domain. Steady and unsteady flow characteristics have been presented with the help of temporal variation of velocity signals, phase space trajectories, power spectral density, instantaneous streamlines, and iso Q-surfaces. Heat transfer characteristics have been presented with the help of instantaneous Nusselt number contours and time-averaged values of Nusselt number.



中文翻译:

顶壁配置对正弦波通道非定常流动和传热特性的影响

摘要

在目前的工作中,进行了三维数值研究,以研究顶壁约束对正弦波状通道非定常流动和传热特性的影响。本研究中考虑的不同通道限制是具有正弦底壁和平面、同相和异相顶壁配置的通道。通过使用开源计算流体动力学包 OpenFOAM 进行计算。数值结果根据文献中报道的实验结果进行了验证。通过监测域中某一点的速度,已经确定了通道中不稳定流动和三维度的开始。借助速度信号的时间变化、相空间轨迹、功率谱密度、瞬时流线和 iso Q 表面。借助瞬时努塞尔数等值线和努塞尔数的时间平均值,介绍了传热特性。

更新日期:2021-02-02
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