diffusion coefficient

bitak · January 22, 2013, 06:56

hello.
how i can enter diffusion coefficient (m^2 s^-1) in cfx solver?
thanks

evcelica · January 22, 2013, 07:29

0.002 [m^2 * s^-1]
or
0.002 [m^2 / s^1]

bitak · January 22, 2013, 17:11

there are same, no?

evcelica · January 24, 2013, 16:22

yes, exactly the same, but you can do it either way.

bitak · January 25, 2013, 00:27

Thank you.
but infact my question is : when in article talk about diffusion coefficient, for transfer particle in the tube and calculate concentration of oarticles on tube wall, how i can enter this coeffichent in solver cfx?

evcelica · January 25, 2013, 01:16

You would model the scalar as an additional variable and in the domain you would enter the kinematic diffusivity of the scalar.

bitak · January 25, 2013, 08:07

really thank you.

January 22, 2013, 06:56	diffusion coefficient	#1
bitak Member bitak Join Date: Jul 2009 Posts: 56 Rep Power: 16	hello. how i can enter diffusion coefficient (m^2 s^-1) in cfx solver? thanks

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January 22, 2013, 07:29		#2
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,167 Rep Power: 23	0.002 [m^2 * s^-1] or 0.002 [m^2 / s^1]

January 22, 2013, 17:11		#3
bitak Member bitak Join Date: Jul 2009 Posts: 56 Rep Power: 16	there are same, no?

January 24, 2013, 16:22		#4
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,167 Rep Power: 23	yes, exactly the same, but you can do it either way.

January 25, 2013, 00:27		#5
bitak Member bitak Join Date: Jul 2009 Posts: 56 Rep Power: 16	Thank you. but infact my question is : when in article talk about diffusion coefficient, for transfer particle in the tube and calculate concentration of oarticles on tube wall, how i can enter this coeffichent in solver cfx?

January 25, 2013, 01:16		#6
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,167 Rep Power: 23	You would model the scalar as an additional variable and in the domain you would enter the kinematic diffusivity of the scalar.

January 25, 2013, 08:07		#7
bitak Member bitak Join Date: Jul 2009 Posts: 56 Rep Power: 16	really thank you.