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boussinesq approximation when temperature difference is large |
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June 25, 2019, 00:11 |
boussinesq approximation when temperature difference is large
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#1 |
New Member
HakminLee
Join Date: Jun 2019
Posts: 3
Rep Power: 7 |
I'm studying on the natural convection of spent fuel in the dry storage system.
I understand that boussinesq approximation can be used only when the temperature difference is small. If the temperature range is 300K-500K for example, is it right to simply use an incompressible ideagl gas law that uses the p=rho*R*T law? Or can i just use the boussinesq approximation? i don't know about these. Thank your reply. |
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June 25, 2019, 12:38 |
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#2 |
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Erik
Join Date: Feb 2011
Location: Earth (Land portion)
Posts: 1,183
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That temperature range is too large for Boussinesq. I've heard 10% density difference maximum. Ideal gas is not incompressible, it is definitely compressible, and using that for density would be much more appropriate.
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June 25, 2019, 21:20 |
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#3 |
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HakminLee
Join Date: Jun 2019
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September 15, 2020, 16:07 |
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#4 | |
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Sai Krishna
Join Date: May 2018
Posts: 37
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Quote:
I have a doubt regarding coefficient of thermal expansion which we use in boussinesq approximation. I am doing simulation for natural convection for a pcb in an enclosure. the freestream temp is 322K. i read bousinesq approximation is valid iff beta * (T-T_ref) <0.05. in this for beta what should I consider. my fluid is air and as its an ideal gas beta = 1/T. so here what temperature should I use. Thanks for the help |
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Tags |
boussinesq approximation, natural convection |
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