文章摘要
管内流体脉动层流动力学特性研究
Dynamics Characteristics of Laminar Pulsed Flow of fluid in a Circular Pipe
投稿时间:2018-01-12  修订日期:2018-03-01
DOI:
中文关键词: 脉动流  层流  剪切力  压降  频率
英文关键词: pulsed flow  laminar  shear stress  frequency
基金项目:(Foundation item):国家自然科学基金资助项目(51676209);中南大学中央高校基本科研业务费专项资金资助(2017zzts170)
作者单位E-mail
蔡玲玲 中南大学 能源科学与工程学院 cll0328@163.com 
米沙 中南大学 能源科学与工程学院  
刘志强 中南大学 能源科学与工程学院 cll0328@163.com 
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中文摘要:
      本文采用数值模拟方法对流体在圆管内低频率脉动层流动力学特性进行了研究,分析了管内脉动流速度以及流体剪切应力分布特性。研究结果表明:脉动层流的速度分布出现回流现象,且速度边界效应的范围与脉动频率有关。脉动频率越大,速度边界层范围越小,边界层内速度梯度却越大;在边界层内,流体剪切力的作用方向出现周期性变化;随着无因次振幅的增大,壁面剪切力先逐渐增大,然后逐渐降低,最后趋近于某一值。而管道压降随着无因次振幅的增大最初变化并不明显,在f=0.6时压降急剧增大,而f=0.8时明显降低。综合考虑脉动频率和振幅对壁面剪切力与压降的影响规律,存在最佳无因次振幅,且0
英文摘要:
      In this paper, the dynamic characteristics of laminar pulsating flow at low frequency are studied by numerical simulation. The distribution characteristics of velocity and shear stress distribution are analyzed. The results indicate that the flow reversal happens and the thickness of velocity boundary effect is related to the frequency. The bigger the frequency, the smaller velocity boundary layer, but the smaller the velocity gradient in boundary layer. In the thickness of velocity boundary effect, the direction of shear stress changes periodically. The wall shear stress increase and then decrease with the increase of the dimensionless amplitude, it is tend to stable value in the end. The pressure drop have no obvious change at first with increase of amplitude, it increases dramatically when f=0.6 and decrease obviously when f=0.8. Considering the influence of frequency and amplitude on wall shear stress and pressure drop, the dimensionless amplitude has an optimum value and the frequency is best in range of 0
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