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What does mean adding / oppossing buoyancy in a flow? |
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October 25, 2017, 17:46 |
What does mean adding / oppossing buoyancy in a flow?
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#1 |
Senior Member
Hector Redal
Join Date: Aug 2010
Location: Madrid, Spain
Posts: 243
Rep Power: 16 |
Hi,
I have a question/doubt regarding a flow with forced convection interacting with gravitational forces (mixed natural / forced convection). Let's say that we have an horizontal velocity V (Vx,0) in the flow (Vx > 0). And the gravity acting horizontally as well g (gx,0). What does it mean adding / opposing buoyancy? How can I interpret the term "adding"? Does it means gx > 0? or Does it means gx < 0? Best regards, Hector. |
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October 26, 2017, 03:33 |
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#2 | |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,776
Rep Power: 71 |
Quote:
adding buoyancy is nothing else that introducing the forcing, "opposing" I suppose stands for the sign of the velocity vector opposing to the gravity one. Why are upou considering gravity acting in horizontal direction? |
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October 26, 2017, 18:09 |
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#3 | |
Senior Member
Hector Redal
Join Date: Aug 2010
Location: Madrid, Spain
Posts: 243
Rep Power: 16 |
Quote:
Let's say that the X axis is set in the vertical line and the Y axis has been set horizontally, perpendiculary to the other axis. It is just that the reference has been turned 90 degrees (to the left). My understanding is that when you state: - Adding, it means that the gravity is in the opposity direction of the flow: Vx > 0 and gx < 0. - Opposing, it means that the gravity is in the same direction as the flow: Vx > 0 and gx > 0. |
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October 30, 2017, 04:13 |
Adding means
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#4 |
New Member
ANTONY AROUL RAJ V
Join Date: Jan 2012
Location: Chennai
Posts: 22
Rep Power: 14 |
Its like water flowing from a tank on vertical pipe. Body force direction and velocity directions are same.
Adding means gx > 0 and vx > 0 When water flows vertically up(by pumping) then gx > 0 and vx < 0 |
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