A quantitative method to describe the flow characteristics of an oscillating flow including porous media
A quantitative method to describe the flow characteristics of an oscillating flow including porous media
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一种描述多孔介质振荡流流动特性的定量方法
DOI：
10.1016/j.ijheatmasstransfer.2017.11.119
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发表时间：
2018-04
影响因子：
5.2
通讯作者：
Gang Xiao
中科院分区：
文献类型：
--
作者：
Mingjiang Ni;Hao Peng;Umair Sultan;KunLuo;Gang Xiao
包括多孔介质在内的振荡流的流动特性对于设计基于振荡流的装置非常重要。进行了实验和模拟相结合的研究，以提供对振荡流的全面定量理解。通过多孔介质的循环速率是一个特别基本的参数，是基于无量纲压降提出的，作为振荡流相似参数的校正因子。引入了基于循环速率的修正无量纲流体位移，并提出了计算多孔介质循环平均摩擦系数的相关方程。在多孔介质和活塞内的气体运动之间观察到显着的相位差（7-71°），该相位差随着多孔介质压降的增加而增加。提出了另一个相关方程来预测相位差。应该指出的是，多孔介质的压降也会影响气缸和多孔介质之间的其他热交换器内的流动。靠近圆柱体的质量流量与邻近多孔介质的质量流量在幅度和相位差方面有很大不同。不同横截面的质量流量随活塞上表面和监测横截面之间的体积线性变化。最后，提出了一种定量方法来描述包含多孔介质的振荡流的流动特性，有望改进基于振荡流的装置的设计方法。
The flow characteristics of an oscillating flow including porous media are very important for designing oscillating-flow-based devices. A combined experimental and simulation study is carried out to provide a comprehensive quantitative understanding of the oscillating flows. The cycle rate through porous media, a particularly basic parameter, is proposed based on the dimensionless pressure drop as a correction factor for the similarity parameters of the oscillating flows. A modified dimensionless fluid displacement is introduced based on the cycle rate, and a correlation equation is proposed to calculate the cycle-averaged friction factor of porous media. Significant phase difference (7–71°) is observed between the movements of gas inside porous media and pistons, which increases with the increasing pressure drop of porous media. Another correlation equation is proposed to predict the phase difference. It should be noted that the pressure drop of porous media would also affect the flows inside other heat exchangers between cylinder and porous media. The mass flow rate next to the cylinder is very different from that adjacent to the porous media in terms of amplitude and phase difference. Mass flow rates at different cross sections vary linearly with the volume between the piston upper surface and the monitored cross section. Finally, a quantitative method is proposed to describe the flow characteristics of an oscillating flow including porous media, which is expected to improve the design methods of oscillating-flow-based devices.
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