species transport, mass transfer rate

mattK · February 20, 2014, 09:30

hi ,

Im trying to get the mass transfer rate of water vapour from a flat plate.

the setup is the plate is in a box with an inlet at one end and outlet at the other, warm air is coming in and over the plate (at 0.5m/s). The model being used is species transport without reactions.

what I can get is the mass fraction of air and h2o in the system, but cannot find how to get the rate of mass transfer (which I think should be in kg/s)by this I mean the rate at which the water vapur is removed form the flat plate.

is the function available in fluent or would I need a Udf to get it?

A CFD free user · February 21, 2014, 05:06

Hi Mattk,
Go to Report/Flux report and from the right column (boundaries), select the appropriate place you want to have mass flow rate. Another option is surface integral from report and from that you can receive several kinds of mass flow report.

mattK · February 21, 2014, 13:40

thank you for that,

I will have another look and see how I get on

kind regards

Jack0210Jack · April 2, 2021, 06:44

Hi,

I have this issue as well. I would like to know the mass transfer rate in the domain not the surface. How should I get it.

Thanks.

cbooks77 · September 16, 2021, 15:22

If you are using a built in interphase mass transfer model or custom UDF then just go to the phase interaction under the dropdown for a contour plot. This will show the mass transfer rate in kg/(m3-s)

February 20, 2014, 09:30	species transport, mass transfer rate	#1
mattK New Member mattk Join Date: Feb 2014 Posts: 4 Rep Power: 12	hi , Im trying to get the mass transfer rate of water vapour from a flat plate. the setup is the plate is in a box with an inlet at one end and outlet at the other, warm air is coming in and over the plate (at 0.5m/s). The model being used is species transport without reactions. what I can get is the mass fraction of air and h2o in the system, but cannot find how to get the rate of mass transfer (which I think should be in kg/s)by this I mean the rate at which the water vapur is removed form the flat plate. is the function available in fluent or would I need a Udf to get it?

February 21, 2014, 05:06		#2
A CFD free user Senior Member A-A Azarafza Join Date: Jan 2013 Posts: 226 Rep Power: 14	Hi Mattk, Go to Report/Flux report and from the right column (boundaries), select the appropriate place you want to have mass flow rate. Another option is surface integral from report and from that you can receive several kinds of mass flow report. __________________ Regard yours

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February 21, 2014, 13:40		#3
mattK New Member mattk Join Date: Feb 2014 Posts: 4 Rep Power: 12	thank you for that, I will have another look and see how I get on kind regards

April 2, 2021, 06:44		#4
Jack0210Jack New Member Join Date: Mar 2021 Posts: 25 Rep Power: 5	Hi, I have this issue as well. I would like to know the mass transfer rate in the domain not the surface. How should I get it. Thanks.

September 16, 2021, 15:22		#5
cbooks77 New Member Chris Join Date: Mar 2021 Posts: 23 Rep Power: 5	If you are using a built in interphase mass transfer model or custom UDF then just go to the phase interaction under the dropdown for a contour plot. This will show the mass transfer rate in kg/(m3-s)