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August 24, 2021, 09:06
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Downward Thermal buoyancy force
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#1 |
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Member
Rabi Pathak
Join Date: Jul 2020
Posts: 32
Rep Power: 6  |
Can someone explain me the concept of downward thermal buoyancy force due to the evaporative cooling near the liquid gas interface? How the air starts flowing downward suddenly instead of convecting up?
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August 24, 2021, 13:13
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#2 |
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Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,747
Rep Power: 66 |
Hot stuff rises. Cold stuff sinks.
Btw, the acting force is gravity. You should really be asking why anything ever convects upward even though gravity is always downwards. If you really understand why heat rises... |
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August 25, 2021, 09:26
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#3 | |
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New Member
Continuum
Join Date: Aug 2009
Posts: 19
Rep Power: 17 |
Quote:
Practical example is starting a fire in a cold fireplace. Heavy cold air forces a downdraft until the balance of forces can reverse the flow. |
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