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Numerical Analysis of Heat Transfer from a Moving Surface Due to Impingement of Slot Jets

机译：缝隙射流撞击运动表面传热的数值分析

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摘要

Heat transfer from a moving surface with uniform wall temperature due to impingement of series of slot jets has been investigated numerically. In the present paper, transition-shear stress transport model has been used for numerical simulations, which can predict the heat transfer in laminar as well as turbulent flows. This model is adopted here to study the transport phenomenon and predict the transition from laminar to turbulent flow seamlessly under different surface velocities. The present model with stationary surface is validated with the correlation given by Martin for series of slot jets. It has also shown good agreement with existing data for both laminar and turbulent slot jets, and is further studied to understand the heat transfer under wide range of flow conditions and the effect of surface velocity on flow regime. The range of Reynolds number is from 100 to 5,000, whereas surface velocity varied up to six times the jet velocity at the nozzle exit. It has been observed that at high surface velocities the heat transfer from the moving wall is more than stationary case. The transition from laminar to turbulent regime is found to be starting at a Reynolds number of 400 and turns completely turbulent at a Reynolds number of 3,000. Q-criterion is used to confirm the transition zone by observing the breaking of vortices at higher Reynolds number.
机译：由于一系列缝隙射流的撞击，从具有均匀壁温的运动表面传热的过程已经进行了数值研究。在本文中，过渡-剪切应力传递模型已经用于数值模拟，可以预测层流和湍流中的热传递。在此采用此模型来研究运输现象，并预测在不同表面速度下从层流到湍流的无缝过渡。具有静止表面的本模型已通过马丁给出的一系列缝隙射流的相关性进行了验证。它也显示了与层流和湍流缝隙射流的现有数据的良好一致性，并且进行了进一步研究以了解在宽范围的流动条件下的传热以及表面速度对流动状态的影响。雷诺数的范围是100到5,000，而表面速度的变化最多是喷嘴出口处射流速度的六倍。已经观察到，在高表面速度下，来自移动壁的热传递比固定情况更多。发现从层流状态到湍流状态的转变始于雷诺数为400，而完全转变为雷诺数为3,000。 Q准则用于通过观察较高雷诺数下的涡旋破坏来确认过渡区。

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  • 来源
    《Heat Transfer Engineering》 |2018年第4期|98-106|共9页
  • 作者

    Phani Krishna Kadiyala; Himadri Chattopadhyay;

  • 作者单位

    Mechanical Engineering Section, Government Polytechnic, Visakhapatnam, India;

    Department of Mechanical Engineering, Jadavpur University, Kolkata, India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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