# Interfacial area density while setting in the porous domain

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 December 14, 2012, 23:02 Interfacial area density while setting in the porous domain #1 Senior Member   Govindaraju Join Date: Apr 2010 Posts: 206 Rep Power: 9 Dear friend Can you please give the information about inter-facial area density calculation For example I have straight pipe which is porous domain of inner radius 10mm and thickness of the wall 3mm and length of the pipe is 100mm through which fluid flow through it How to calculate inter-facial area density I did this way Inter facial area density= surface area contact/ Volume surface area= 2*pi*r*h/pi *r^2*h =2*pi*10*100/ pi*10^2*100 = 2/10 mm^-1 Kindly give your valuable feedback Thank you Regards Govind

 December 15, 2012, 10:19 #2 Senior Member   Govindaraju Join Date: Apr 2010 Posts: 206 Rep Power: 9 Dear friends I did Catalytic converter tutorial. I am in doubt how they set interfacial area density 360 m ^-1 Thanks for your time Thank you Regards Govind

 December 15, 2012, 10:51 #3 Senior Member   Chris DeGroot Join Date: Nov 2011 Location: Canada Posts: 388 Rep Power: 8 Interfacial area density is the amount of surface area per unit volume. The value for metal foams, for example, is usually in the thousands. 360m^-1 could be reasonable for a catalytic converter. Note how this wouldn't be constant if a pore shape is scaled down. If the formula is A/V and you scale down by a factor of two, the interfacial area density doubles. Therefore this number is higher for smaller pore sizes.

December 15, 2012, 13:12
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Govindaraju
Join Date: Apr 2010
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Quote:
 Originally Posted by cdegroot Interfacial area density is the amount of surface area per unit volume. The value for metal foams, for example, is usually in the thousands. 360m^-1 could be reasonable for a catalytic converter. Note how this wouldn't be constant if a pore shape is scaled down. If the formula is A/V and you scale down by a factor of two, the interfacial area density doubles. Therefore this number is higher for smaller pore sizes.
Dear friend cdegroot
Can you please explain bit with catalytic converter.
This 360 m^-1 is randomly assigned or any approximate calculation to arrive this.If there is a calculation to arrive this value please share with me
if I don't know how to get interfacial area density through calculation, How do I fix my interfacial area density for my model ?( porosity value known).
Thank you for spending your precious time for me.

Thank you
Govind

 December 15, 2012, 15:46 #5 Senior Member   Chris DeGroot Join Date: Nov 2011 Location: Canada Posts: 388 Rep Power: 8 I think the 360m^-1 is randomly assigned as a quasi-reasonable value for a catalytic converter. To determine your interfacial area density you need to know something about your pore shape (is it a packed bed, tube bundle, foam, etc) and the pore size. If it's a common shape you should be able to find data for it. If not, come up with a simplified model and calculate it.

 December 15, 2012, 22:27 #6 Senior Member   Govindaraju Join Date: Apr 2010 Posts: 206 Rep Power: 9 Dear friend I need to put interfacial area density in my arterial modelling. I know the porosity and permeability value. Is there any way to calculate interfacial area density. I am also searching the data available in the journal Please share your ideas for my work Thank you Regards Govind

 December 15, 2012, 23:05 #7 Senior Member   Chris DeGroot Join Date: Nov 2011 Location: Canada Posts: 388 Rep Power: 8 There is no way to calculate just knowing permeability and porosity. I think you may be able to find something in the literature to help you.

 December 15, 2012, 23:20 #8 Senior Member   Chris DeGroot Join Date: Nov 2011 Location: Canada Posts: 388 Rep Power: 8 If you are doing bioheat modeling here is a good review with a simple expression for interfacial area density. http://th1a8.eng.shizuoka.ac.jp/~hea...g%20Theory.pdf

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