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free convection between isothermal vertical plates

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Old   September 22, 2001, 10:42
Default free convection between isothermal vertical plates
  #1
runny craven
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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.
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Old   September 23, 2001, 00:42
Default Re: free convection between isothermal vertical pl
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John C. Chien
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(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.
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Old   September 23, 2001, 11:36
Default Re: free convection between isothermal vertical pl
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Mr. Mix
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Try: Buoyancy-induced flows and transport (1988)

Gebhart, B. et.al
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Old   September 23, 2001, 13:54
Default Re: free convection between isothermal vertical pl
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Jim Park
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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.
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Old   September 23, 2001, 16:52
Default Re: free convection between isothermal vertical pl
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COBOK
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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.

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Old   September 23, 2001, 18:23
Default Re: free convection between isothermal vertical pl
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Mr. Mix
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He said "isothermal vertical plates". The plates are isothermal. The fluid however ought not be.
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Old   September 24, 2001, 05:03
Default Re: free convection between isothermal vertical pl
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Fred Uckfield
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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.
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Old   September 24, 2001, 14:15
Default Re: free convection between isothermal vertical pl
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COBOK
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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.
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Old   September 24, 2001, 14:45
Default Re: free convection between isothermal vertical pl
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John C. Chien
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(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".
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Old   September 24, 2001, 16:30
Default Re: free convection between isothermal vertical pl
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Mr. Mix
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He said nothing about the problem being steady state.
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Old   September 27, 2001, 02:20
Default Re: free convection between isothermal vertical pl
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runny craven
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yes. i'm looking for transient (time depenedent) case.
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Old   September 28, 2011, 13:34
Default free convection between isothermal vertical plates
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ali l ekaid
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hi
Ms Runny Craven

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

Ali
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Old   September 29, 2011, 02:45
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Sebastian Engel
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Hi Ali,

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

Sebastian
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Old   April 6, 2012, 10:45
Default isoflux vertical plates
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Smsc S
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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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