flow uniformity after porous region

nalamyogesh · February 26, 2020, 10:17

Hello All,

I wanted to know if a non uniform flow (at inlet of porous region) comes out of a porous region uniformly (at outlet of porous region) always ?

Thanks,
Yogesh

fluid23 · February 26, 2020, 13:26

Always? No.

It can, but it may or may not make physical sense.

Can you elaborate on why you are asking this question?

LuckyTran · February 26, 2020, 13:32

Linear isotropic homogeneous porous media certainly has a tendency to. The pressure drop through porous media is generally Darcy-like, where the resistance is proportional to the square of velocity (and not linearly proportional to velocity). Whenever you have anything like this, a strong resistance to the fastest regions of the flow, there is a tendency to make the flow more uniform.

But remember LIH and Darcy-equation, etc. are just models. If you have some exotic metamaterial or heck, even dirt, there might be some consequences not covered by these models.

February 26, 2020, 10:17	flow uniformity after porous region	#1
nalamyogesh Member Yogesh Nalam Join Date: Sep 2012 Location: München, Germany Posts: 54 Rep Power: 14	Hello All, I wanted to know if a non uniform flow (at inlet of porous region) comes out of a porous region uniformly (at outlet of porous region) always ? Thanks, Yogesh

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February 26, 2020, 13:26		#2
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 18	Always? No. It can, but it may or may not make physical sense. Can you elaborate on why you are asking this question?

February 26, 2020, 13:32		#3
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,761 Rep Power: 66	Linear isotropic homogeneous porous media certainly has a tendency to. The pressure drop through porous media is generally Darcy-like, where the resistance is proportional to the square of velocity (and not linearly proportional to velocity). Whenever you have anything like this, a strong resistance to the fastest regions of the flow, there is a tendency to make the flow more uniform. But remember LIH and Darcy-equation, etc. are just models. If you have some exotic metamaterial or heck, even dirt, there might be some consequences not covered by these models.