This study examines experimentally the hydrodynamic interaction between a regular porous medium and an adjacent free-flow channel at low Reynolds numbers (Re < 1). The porous medium consists of evenly spaced micro-structured rectangular pillars arranged in a uniform pattern, while the free-flow channel features a rectangular cross-sectional area. The overall arrangement comprises a polydimethylsiloxane microfluidic model where distilled water, doped with fluorescent particles, is the examined fluid. Using micro-particle image velocimetry, single-phase quantitative velocity measurements are carried out at the pore scale to reveal the microscopic characteristics of the flow for such a coupled system. Interfacial velocity-slip and stress-jump coefficients are also evaluated with a volume-averaging method based on the Beavers-Joseph and Ochoa-Tapia-Whitaker models, respectively. The results show that, from a microscopic point of view, parallel flow at the interface is not obtained due to the periodically generated U-shaped flow profile between the interface pillars. However, the interface coefficients show no sensitivity to moderate flow angles. The highly resolved experimental information obtained in this study can also be used for the validation of numerical models providing a unique dataset for free-flow and porous media coupled systems.
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April 2019
Research Article|
April 02 2019
Microscopic velocity field measurements inside a regular porous medium adjacent to a low Reynolds number channel flow
A. Terzis;
A. Terzis
a)
1
Institute of Aerospace Thermodynamics (ITLR), University of Stuttgart
, 70569 Stuttgart, Germany
a)Author to whom correspondence should be addressed: [email protected]
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I. Zarikos;
I. Zarikos
2
Multiscale Engineering Fluid Dynamics (MEFD), Eindhoven University of Technology
, 5600 MB Eindhoven, The Netherlands
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K. Weishaupt;
K. Weishaupt
3
Department of Hydromechanics and Modelling of Hydrosystems (IWS), University of Stuttgart
, 70569 Stuttgart, Germany
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G. Yang
;
G. Yang
4
Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University (SJTU)
, 200240 Shanghai, China
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X. Chu
;
X. Chu
1
Institute of Aerospace Thermodynamics (ITLR), University of Stuttgart
, 70569 Stuttgart, Germany
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R. Helmig;
R. Helmig
3
Department of Hydromechanics and Modelling of Hydrosystems (IWS), University of Stuttgart
, 70569 Stuttgart, Germany
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B. Weigand
B. Weigand
1
Institute of Aerospace Thermodynamics (ITLR), University of Stuttgart
, 70569 Stuttgart, Germany
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a)Author to whom correspondence should be addressed: [email protected]
Physics of Fluids 31, 042001 (2019)
Article history
Received:
February 08 2019
Accepted:
March 14 2019
Citation
A. Terzis, I. Zarikos, K. Weishaupt, G. Yang, X. Chu, R. Helmig, B. Weigand; Microscopic velocity field measurements inside a regular porous medium adjacent to a low Reynolds number channel flow. Physics of Fluids 1 April 2019; 31 (4): 042001. https://doi.org/10.1063/1.5092169
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