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Laminar flow drag reduction on soft porous media.

Abstract：

:While researches have focused on drag reduction of various coated surfaces such as superhydrophobic structures and polymer brushes, the insights tso understand the fundamental physics of the laminar skin friction coefficient and the related drag reduction due to the formation of finite velocity at porous surfaces is still relatively unknown. Herein, we quantitatively investigated the flow over a porous medium by developing a framework to model flow of a Newtonian fluid in a channel where the lower surface was replaced by various porous media. We showed that the flow drag reduction induced by the presence of the porous media depends on the values of the permeability parameter α = L/(MK)1/2 and the height ratio δ = H/L, where L is the half thickness of the free flow region, H is the thickness and K is the permeability of the fiber layer, and M is the ratio of the fluid effective dynamic viscosity μe in porous media to its dynamic viscosity μ. We also examined the velocity and shear stress profiles for flow over the permeable layer for the limiting cases of α → 0 and α → ∞. The model predictions were compared with the experimental data for specific porous media and good agreement was found.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Mirbod P,Wu Z,Ahmadi G

doi

10.1038/s41598-017-17141-3

subject

Has Abstract

pub_date

2017-12-08 00:00:00

pages

17263

issue

1

issn

2045-2322

pii

10.1038/s41598-017-17141-3

journal_volume

7

pub_type

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