Influence of including viscous dissipation

Chilli83 · April 15, 2009, 04:40

Hi all

I am modelling a HVAC case including heat load from 150 people. Under the Heat Transfer I can include Viscous Dissipation which not has been activated for my simulations. My question is then if this not are incorrect and should be activated?

Kind regards
Michael

pratikmehta · April 15, 2009, 11:25

Hi,

I do not think you need to activate that option for your application.

Chilli83 · April 15, 2009, 15:24

Hi pratikmehta

thanks for your reply. I have run two simulataions one where it was activate and another where it was't. I could not see any difference in the result. So I think it will be ignore as you also think.

kind regards
michael

ghorrocks · April 15, 2009, 19:29

Hi,

You should try to understand what the buttons mean before you turn them on and off. Viscous dissipation in heat transfer is heat generation due to viscous action, like what you get with an oil film in strong shear.

So yes, you can be confident for HVAC applications this is not a significant effect and can be left off.

Glenn Horrocks

April 15, 2009, 04:40	Influence of including viscous dissipation	#1
Chilli83 New Member Michael Join Date: Apr 2009 Posts: 20 Rep Power: 17	Hi all I am modelling a HVAC case including heat load from 150 people. Under the Heat Transfer I can include Viscous Dissipation which not has been activated for my simulations. My question is then if this not are incorrect and should be activated? Kind regards Michael

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April 15, 2009, 11:25		#2
pratikmehta Member Pratik Mehta Join Date: Mar 2009 Posts: 32 Rep Power: 17	Hi, I do not think you need to activate that option for your application.

April 15, 2009, 15:24		#3
Chilli83 New Member Michael Join Date: Apr 2009 Posts: 20 Rep Power: 17	Hi pratikmehta thanks for your reply. I have run two simulataions one where it was activate and another where it was't. I could not see any difference in the result. So I think it will be ignore as you also think. kind regards michael

April 15, 2009, 19:29		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	Hi, You should try to understand what the buttons mean before you turn them on and off. Viscous dissipation in heat transfer is heat generation due to viscous action, like what you get with an oil film in strong shear. So yes, you can be confident for HVAC applications this is not a significant effect and can be left off. Glenn Horrocks