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Natural Convection Heat Transfer

Posted 21.07.2009, 12:07 GMT-4 4 Replies

Nicolas Murer
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Hello,

I'm using the Conduction and Convection application mode to model the heat transfer resulting from a hot plate in an upward contact with water.
Does anyone know the expression of the velocity of the fluid for natural convection in these conditions ?
Thanks.

Nicolas
4 Replies Last Post 19.08.2009, 21:27 GMT-4
David Wenger Certified Consultant
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Posted: 2 decades ago 21.07.2009, 12:46 GMT-4
The velocity depends on the heat transfer rate and the difference of density and temperature in your system. You need a heat transfer coefficient which is f(Re,Pr,Gr,...) and a temperature-dependent expression for the density or the Boussinesq-approximation.

Regards

David
www.comsol.de/company/consultants/wenger
The velocity depends on the heat transfer rate and the difference of density and temperature in your system. You need a heat transfer coefficient which is f(Re,Pr,Gr,...) and a temperature-dependent expression for the density or the Boussinesq-approximation. Regards David www.comsol.de/company/consultants/wenger
Nicolas Murer
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Posted: 2 decades ago 21.07.2009, 14:31 GMT-4
There is a model in the model gallery which is very similar to my problem : free convection in a water glass
comsol.com/showroom/gallery/195/
Unfortunately, I don't find it in the Model Library. Is there another way to have access to this model ?

Thanks

Nicolas
There is a model in the model gallery which is very similar to my problem : free convection in a water glass http://comsol.com/showroom/gallery/195/ Unfortunately, I don't find it in the Model Library. Is there another way to have access to this model ? Thanks Nicolas
Nicolas Murer
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Posted: 2 decades ago 21.07.2009, 15:01 GMT-4

The velocity depends on the heat transfer rate and the difference of density and temperature in your system. You need a heat transfer coefficient which is f(Re,Pr,Gr,...) and a temperature-dependent expression for the density or the Boussinesq-approximation.

Regards

David
www.comsol.de/company/consultants/wenger


Thanks.
[QUOTE] The velocity depends on the heat transfer rate and the difference of density and temperature in your system. You need a heat transfer coefficient which is f(Re,Pr,Gr,...) and a temperature-dependent expression for the density or the Boussinesq-approximation. Regards David www.comsol.de/company/consultants/wenger [/QUOTE] Thanks.
rodrigo bassan
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Posted: 2 decades ago 19.08.2009, 21:27 GMT-4
hi, someone have or know where I can found the solution manual of book Convection Heat Transfer, third edition of author Adrian Bejan, because I need very much in my pos-graduate. thanks.

my e mail is augusto_bassan@yahoo.com.br

hi, someone have or know where I can found the solution manual of book Convection Heat Transfer, third edition of author Adrian Bejan, because I need very much in my pos-graduate. thanks. my e mail is augusto_bassan@yahoo.com.br

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