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runny craven September 22, 2001 10:42

free convection between isothermal vertical plates
 
hi

i'll be happy if anyone has or help me find a solution of free convection between two isothermal vertial parallel plates. please :((

Runny.

John C. Chien September 23, 2001 00:42

Re: free convection between isothermal vertical pl
 
(1). ASME/Journal of Heat Transfer would be a good place to start the searching. (2). Normally, heat transfer text books would include the natural convection over a vertical plate.

Mr. Mix September 23, 2001 11:36

Re: free convection between isothermal vertical pl
 
Try: Buoyancy-induced flows and transport (1988)

Gebhart, B. et.al

Jim Park September 23, 2001 13:54

Re: free convection between isothermal vertical pl
 
This may be a bit more complex than you're seeking since it involves conjugate heat transfer and radiative transport as well as convection between the vertical walls, but take a look at

J. E. Park, and J. R. Kirkpatrick, Heat Loss Through Building Envelopes Due To Convective Loops, Martin Marietta Energy Systems Inc., Report K/CSD/TM-80, October, 1988.

J. E. Park, J. R. Kirkpatrick, J. N. Tunstall, and K. W. Childs, Building Wall Heat Flux Calculations, American Society of Heating, Refrigerating and Air Conditioning Engineers TRANSACTIONS, Volume 93, pt. 2, pp. 120-136, 1988.

The first is a U. S. Department of Energy report that may still be available from the U. S. Government document repositories, especially the DOE document repository in Oak Ridge, TN. The second is a shorter journal article drawn from the report.

COBOK September 23, 2001 16:52

Re: free convection between isothermal vertical pl
 
If you mean "the same temperatures" by "isothermal plates", the answer will be -- there's no free convection between these plates for the steady state case as there is no driving force (no temperature difference). If you implied something else, I'd assume you need to be more specific.

If you meant transient (time depenedent) case -- that could be different.


Mr. Mix September 23, 2001 18:23

Re: free convection between isothermal vertical pl
 
He said "isothermal vertical plates". The plates are isothermal. The fluid however ought not be.

Fred Uckfield September 24, 2001 05:03

Re: free convection between isothermal vertical pl
 
The aspect ratio of the configuration seems to be the critical factor (based on what's discussed in the literature). A square type closed cavity is an easier task for existing CFD than a very narrow one. In a narrow cavity (e.g. idealized double glazing) the natural convective boundary layers interact in the central vertical plane of the cavity.This produces some lovely buoyancy induced strains. A good excersize for a turbulence model, if you are interested in the turbulent regime.

Good luck, you'll need it ;)

Fred.

COBOK September 24, 2001 14:15

Re: free convection between isothermal vertical pl
 
He also said "free convection", so no forced convection either. So, whatever temperature distribution you have initially, for steady state case (if it does exist) -- there will no convection. Otherwise, you get time-dependent problem.

He may have implied plates maintained at different temperature.

John C. Chien September 24, 2001 14:45

Re: free convection between isothermal vertical pl
 
(1). "isothermal" is artificial. So, it must be maintained by heat source. (2). If the temperature of the plate is equal to the free stream temperature, then "equilibrium" is used instead of "isothermal".

Mr. Mix September 24, 2001 16:30

Re: free convection between isothermal vertical pl
 
He said nothing about the problem being steady state.

runny craven September 27, 2001 02:20

Re: free convection between isothermal vertical pl
 
yes. i'm looking for transient (time depenedent) case.

alialkinani September 28, 2011 13:34

free convection between isothermal vertical plates
 
hi
Ms Runny Craven

I has solution for your problem about transient isothermal vertical parallel plates but how can i help you.

Ali

bluebase September 29, 2011 02:45

Hi Ali,

i guess the problem is solved ten years ago. the thread is from 2001.

Sebastian

smsc59 April 6, 2012 10:45

isoflux vertical plates
 
Hello,

I know this is an old thread but was wondering if anyone has a working mesh/case that works in FLUENT for vertical plate(s) that has heat flux, q" in a cavity with fluid. Could you please share your case? I am working in a similar problem as runny craven but with isoflux plates. And I have a big problem setting up the correct meshing with the correct options in FLUENT.

Thanks

p/s I am a beginner in both meshing(Gambit) & FLUENT


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