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首页> 外文期刊>Heat Transfer Engineering >Heat Transfer from Pulsating Laminar Impingement Slot Jet on a Flat Surface with Inlet Velocity: Sinusoidal and Square Wave
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Heat Transfer from Pulsating Laminar Impingement Slot Jet on a Flat Surface with Inlet Velocity: Sinusoidal and Square Wave

机译：脉动层流槽式射流在入口速度平坦的表面上的热传递：正弦波和方波

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摘要

Heat transfer from a pulsating laminar impingement slot jet on a flat surface was investigated numerically and experimentally. Inlet velocity was considered sinusoidal velocity and square wave velocity. Experimental studies were done only for the sinusoidal velocity state. An inverse heat conduction method, conjugated gradient method with adjoint equation, was used for the experimental estimation of the local heat transfer coefficient along the target surface. Effect of the square wave velocity of the laminar impingement slot jet was studied numerically. The results show pulsations in flow change flow patterns and the thermal boundary layer thickness because of the newly forming thermal boundary layer is extremely small each time the flow is resumed. Heat transfer rate in this state enhances due to pulsating inlet velocity in comparison with steady state. Heat transfer increases with increasing pulsation amplitude. Enhancement in mean heat transfer on the target plate for sinusoidal velocity is rather than square wave velocity.
机译：数值和实验研究了来自脉动层流狭缝射流在平面上的传热。入口速度被认为是正弦速度和方波速度。仅针对正弦速度状态进行了实验研究。实验采用逆热传导法，共轭梯度法和伴随方程对沿目标表面的局部传热系数进行了实验估算。数值研究了层流冲击缝隙射流对方波速度的影响。结果表明，每次重新恢复流动时，由于新形成的热边界层，流动变化的流型和热边界层厚度的脉动极小。与稳态相比，由于脉动入口速度，该状态下的传热速率提高。传热随着脉动幅度的增加而增加。对于正弦波速度，目标板上平均传热的增加而不是方波速度。

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  • 来源
    《Heat Transfer Engineering》 |2018年第12期|901-913|共13页
  • 作者

    Somayeh Davoodbadi Farahani; Farshad Kowsary;

  • 作者单位

    Mechanical Engineering Department, Arak University of Technology, Arak, Iran;

    Department of Mechanical Engineering, University of Tehran, Tehran, Iran;

  • 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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