- #1
marval
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Homework Statement
Heat transfer due to natural convection in a rectangular enclosure with vertical walls that are at different temperatures.
Need a correlation for Nusselt number that could handle an aspect ratio A (width/height-ratio), A > 100 and Rayleigh number Ra > 10³. Also, Prandtl number must be Pr < 1.
Known data: Geometry, gas properties for all needed temperatures (three different gases for a temperature range: 0-100⁰C, so it's too much to post here).
Homework Equations
Nusselt is a function of Ra and Pr:
Nu = f(Ra,Pr)
Nu = (h*L)/k
Ra =(g*β*ΔT*L³)/(α*ν)
Pr = ν/α
Google the different dimensionless number to understand the meanings (and the different parameters).
The Attempt at a Solution
www.google.com and libraries :p
I just need the suitable equations. If anyone knows any literature I can find it in, please do tell.
I found for:
A=1 - 100
Ra<5*10³
Pr=0,1-10
But I need:
A=20-300
Ra=1*10³-1*10⁹
Pr<0,1
ANY tip would be great!
Regards
Marco