How to skip Molar weight for defining new material

Omish · July 14, 2016, 08:28

Hi
I want to add SN 500/CuO nanofluid as a uniform fluid in CFX. In fluent there was need for 4 specifications which I had. But now in CFX there is an extra "molar mass" value which should be given and I don't have it. Is there any way to skip this?

Opaque · July 14, 2016, 11:03

The answer is NO.

You can workaround by providing a dummy value, say 1 [g mol^-1], but you must beware of how such value is used and if it is relevant for your case.

Omish · July 14, 2016, 11:32

Quote:

Originally Posted by Opaque

The answer is NO.

You can workaround by providing a dummy value, say 1 [g mol^-1], but you must beware of how such value is used and if it is relevant for your case.

Thanks for the answer. It's kinda weird !
How is it that fluent solves the same problem without this value and CFX can't?!!

Opaque · July 15, 2016, 11:41

There must be some assumption somewhere CFX is not making

evcelica · July 21, 2016, 16:47

Molar mass is only used in certain calculations, like molar fraction, or ideal gas equations. It won't affect other physics/properties if you put in a dummy value. But you have to provide some value no matter what because it requires that input whether it uses it or not.

Omish · July 21, 2016, 17:17

Thank you dear friends

Opaque & evcelica

July 14, 2016, 08:28	How to skip Molar weight for defining new material	#1
Omish Member Omid Shekari Join Date: Jun 2016 Posts: 43 Rep Power: 9	Hi I want to add SN 500/CuO nanofluid as a uniform fluid in CFX. In fluent there was need for 4 specifications which I had. But now in CFX there is an extra "molar mass" value which should be given and I don't have it. Is there any way to skip this?

July 15, 2016, 11:41		#4
Opaque Senior Member Join Date: Jun 2009 Posts: 1,804 Rep Power: 32	There must be some assumption somewhere CFX is not making Omish likes this.

July 21, 2016, 16:47		#5
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,167 Rep Power: 23	Molar mass is only used in certain calculations, like molar fraction, or ideal gas equations. It won't affect other physics/properties if you put in a dummy value. But you have to provide some value no matter what because it requires that input whether it uses it or not. Omish likes this.

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July 14, 2016, 11:03		#2
Opaque Senior Member Join Date: Jun 2009 Posts: 1,804 Rep Power: 32	The answer is NO. You can workaround by providing a dummy value, say 1 [g mol^-1], but you must beware of how such value is used and if it is relevant for your case.

July 21, 2016, 17:17		#6
Omish Member Omid Shekari Join Date: Jun 2016 Posts: 43 Rep Power: 9	Thank you dear friends Opaque & evcelica