mass transfer coefficient

ArturTU · October 23, 2015, 16:58

Hi all,

I am calculating a flow along a catalytic active wall coupled with surface reaction. And actually i am looking for a way to calculate mass transfer coefficient of spiecies to the wall. For expamle for heat transfer coefficient there is a build-in function in fluent, for mass transfer not.
I can compute the mass transfer coefficient by use of following equation:

n = \beta * A * (c(in) - c(surf))

n - mole flux to the wall
\beta - mass transfer coefficient
c(in) - inlet concentration
c(surf) - surface concentration

For that purpose i need mole flux to the wall but i do not know how to get it in Fluent.

Has someone any idea? I would be glad for any help!
Cheers
Artur

chittipo · October 27, 2015, 10:04

consider using mass transfer model in similar lines the existing heat transfer model.

replace Prandtl number with Schmidt number.
replace Nusselt number with Sherwood number.

October 23, 2015, 16:58	mass transfer coefficient	#1
ArturTU New Member Artur Wiser Join Date: Oct 2015 Posts: 1 Rep Power: 0	Hi all, I am calculating a flow along a catalytic active wall coupled with surface reaction. And actually i am looking for a way to calculate mass transfer coefficient of spiecies to the wall. For expamle for heat transfer coefficient there is a build-in function in fluent, for mass transfer not. I can compute the mass transfer coefficient by use of following equation: n = \beta * A * (c(in) - c(surf)) n - mole flux to the wall \beta - mass transfer coefficient c(in) - inlet concentration c(surf) - surface concentration For that purpose i need mole flux to the wall but i do not know how to get it in Fluent. Has someone any idea? I would be glad for any help! Cheers Artur

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October 27, 2015, 10:04		#2
chittipo Member Join Date: Oct 2011 Posts: 34 Rep Power: 14	consider using mass transfer model in similar lines the existing heat transfer model. replace Prandtl number with Schmidt number. replace Nusselt number with Sherwood number.