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A quantitative method to describe the flow characteristics of an oscillating flow including porous media

机译：描述包含多孔介质的振荡流的流动特性的定量方法

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Highlights•Combined experimental and simulation study is carried out on oscillating flows.•The cycle rate through porous media, a particularly basic parameter, is proposed.•A modified dimensionless fluid displacement is introduced using the cycle rate.•Equations for phase difference and cycle-averaged friction factor are proposed.•A quantitative method to describe flow characteristics is developed.AbstractThe 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.
机译： 突出显示 • 对振荡流进行了组合的实验和模拟研究。 < ce：list-item id =“ o0010”> • 通过多孔介质的循环速率，这是一个非常基本的参数， • 使用循环速率引入修改后的无因次流体排量。 • 相位差和周期平均的方程式 • 开发了一种描述流动特性的定量方法。 摘要 包含多孔介质的振荡流的流动特性对于设计振荡流非常重要基于设备。进行了组合的实验和模拟研究，以提供对振荡流的全面定量了解。基于无量纲的压降作为振荡流相似性参数的校正因子，提出了通过多孔介质的循环速率，这是一个特别基本的参数。提出了一种基于循环速率的改进的无量纲流体排量，并提出了相关方程来计算多孔介质的循环平均摩擦系数。在多孔介质和活塞内部的气体运动之间观察到明显的相位差（7–71°），并且随着多孔介质压降的增加而增大。提出了另一个相关方程来预测相位差。应该注意的是，多孔介质的压降也会影响圆柱体和多孔介质之间其他热交换器内部的流量。就振幅和相位差而言，圆柱体附近的质量流速与多孔介质附近的质量流速有很大差异。不同横截面处的质量流率随活塞上表面和所监测横截面之间的体积线性变化。最后，提出一种定量方法来描述包含多孔介质的振荡流的流动特性，有望改善基于振荡流的装置的设计方法。

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