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Mixed convective heat transfer enhancement in a ventilated cavity by flow modulation via rotating plate

机译：通过旋转板通过流量调制在通风腔中混合对流传热增强

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摘要

The present study numerically explores the mixed convection phenomena in a differentially heated ventilated square cavity with active flow modulation via a rotating plate. Forced convection flow in the cavity is attained by maintaining external fluid flow through an opening at the bottom of the left cavity wall while leaving it through another opening at the right cavity wall. A counter-clockwise rotating plate at the center of the cavity acts as an active flow modulator. Moving mesh approach is used for the rotation of the plate and the numerical solution is achieved using arbitrary Lagrangian-Eulerian finite element formulation with a quadrilateral discretization scheme. Transient parametric simulations have been performed for various frequency of the rotating plate for a fixed Reynolds number (Re) of 100 based on maximum inlet flow velocity while the Richardson number (Ri) is maintained at unity. Heat transfer performance has been evaluated in terms of spatially averaged Nusselt number and time-averaged Nusselt number along the heated wall. Power spectrum analysis in the frequency domain obtained from the fast Fourier transform analysis indicates that thermal frequency and plate frequency start to deviate from each other at higher values of velocity ratio (＞4).
机译：本研究用通过旋转板的主动流动调制数值方式探讨了差动通风方腔中的混合对流现象。通过将外部流体流过左腔壁的底部的开口，同时将外部流体传递通过右腔壁的另一个开口来实现腔中的强制对流流。腔中心处的逆时针旋转板充当有源流调制器。移动网格方法用于板的旋转，并且使用具有四边形离散化方案的任意拉格朗日 - 欧拉有限元配方实现数值解决方案。已经基于最大入口流速的固定雷诺数（RE）的各种频率对旋转板的各种频率进行了瞬态参数模拟，而Richardson号（RI）保持在Unity。已经根据加热壁的空间平均篮板数和时间平均的纽带数来评估传热性能。从快速傅立叶变换分析获得的频域中的功率谱分析表明热频率和板频率在速度比（> 4）的较高值下彼此偏离。

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  • 来源
    《Heat transfer》 |2021年第3期|2339-2361|共23页
  • 作者

    Aminul Islam; Monoranjan Debnath Rony; Mahmudul Islam; Emdadul Haque Chowdhury; Mohammad Nasim Hasan;

  • 作者单位

    Department of Mechanical Engineering Bangladesh University of Engineering and Technology (BUET) Dhaka Bangladesh;

    Department of Mechanical Engineering Bangladesh University of Engineering and Technology (BUET) Dhaka Bangladesh;

    Department of Mechanical Engineering Bangladesh University of Engineering and Technology (BUET) Dhaka Bangladesh;

    Department of Mechanical Engineering Bangladesh University of Engineering and Technology (BUET) Dhaka Bangladesh;

    Department of Mechanical Engineering Bangladesh University of Engineering and Technology (BUET) Dhaka Bangladesh;

  • 收录信息 美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    arbitrary Lagrangian-Eulerian; heat transfer; mixed convection; rotating blade; ventilated cavity;

    机译：Qualtrary Lagrangian-eulerian;传播热量;混合对流;旋转刀片;通风腔;

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