An exploration of physical mechanism for dynamic permeability using a microscopic computational fluid dynamic model

被引:0
|
作者
Chen, Sin-Mao [1 ]
Hong, Boe-Shong [1 ]
Shyu, Shiuh-Hwa [2 ]
Hong, Lany [3 ]
机构
[1] Natl Chung Cheng Univ, Dept Mech Engn, Chiayi 621, Taiwan
[2] WuFeng Univ, Dept Elect Engn, Chiayi 621, Taiwan
[3] Natl Chung Cheng Univ, Taiwan Firmware Acad, Chiayi 621, Taiwan
关键词
ELASTIC WAVES; FLOW; PROPAGATION; TORTUOSITY;
D O I
10.1063/5.0211454
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
Dynamic permeability is a frequency-dependent parameter in the Darcy model for analyzing the porous-flow problem with time-varying pressure. Until now, physical mechanisms behind the associated correlation are still unclear. To uncover the physics, we built a microscopic flow model in which a temporal-sinusoidal pressure difference was applied in the axial flow direction with frequency ranging from one to ten thousand Hertz. Flow phenomenon was found by parallelly comparing the velocity field and negative-pressure-gradient field. Results show that alternating the sign of pressure difference within a time on the order of step-response time constant can restrict the flow development causing a lessening effect on the dynamic permeability. A triangle-wave case shows that the phase angle of dynamic permeability results from the temporal-variation rate of pressure difference. Further physical phenomenon study, such as those with deformation or oscillation of solid medium, can be made based upon the current approach.
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页数:12
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