tutorials spray dryer

sjtusyc · June 18, 2012, 23:02

I have done the tutorial spray dryer.But i am confused about some points.

In the tutorial,a continuous gas named Gas mixture containing H2O and Air ideal gas is created.And a binary mixture of H2O and H2Ol is also created.

According to the tutorial, when i insert the air inlet boundary, i just set Basic settings & Boundary details. I am confused how do computer know what exactly flows in the domain as i do not set about it.

Am i clear?

I hope some would reply, thank you sincerely.
Leo

sjtusyc · June 20, 2012, 08:16

Anyone,please?

ghorrocks · June 20, 2012, 18:49

I am not sure, but I suspect it then uses the default values. The defaults are probably a mass fraction of zero, so pure air.

sjtusyc · June 20, 2012, 22:07

Glenn,thank you again.
I checked the setting,and you are right.
In the boundary settings , the H20 mass fraction is 0,so its pure gas.
I found the reason why i am confused before.The liquid water enteres the domain with pure gas,and they enter the domain with the same velocity.Previous, i assumed there is only liquid water in the water nozzel.
It is interesting that it confused for some time.

June 18, 2012, 23:02	tutorials spray dryer	#1
sjtusyc Member leo Join Date: Jun 2012 Posts: 98 Rep Power: 14	I have done the tutorial spray dryer.But i am confused about some points. In the tutorial,a continuous gas named Gas mixture containing H2O and Air ideal gas is created.And a binary mixture of H2O and H2Ol is also created. According to the tutorial, when i insert the air inlet boundary, i just set Basic settings & Boundary details. I am confused how do computer know what exactly flows in the domain as i do not set about it. Am i clear? I hope some would reply, thank you sincerely. Leo

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June 20, 2012, 08:16		#2
sjtusyc Member leo Join Date: Jun 2012 Posts: 98 Rep Power: 14	Anyone,please?

June 20, 2012, 18:49		#3
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,934 Rep Power: 145	I am not sure, but I suspect it then uses the default values. The defaults are probably a mass fraction of zero, so pure air.

June 20, 2012, 22:07		#4
sjtusyc Member leo Join Date: Jun 2012 Posts: 98 Rep Power: 14	Glenn,thank you again. I checked the setting,and you are right. In the boundary settings , the H20 mass fraction is 0,so its pure gas. I found the reason why i am confused before.The liquid water enteres the domain with pure gas,and they enter the domain with the same velocity.Previous, i assumed there is only liquid water in the water nozzel. It is interesting that it confused for some time.