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On November 18, 2009 at 10:48, Gizmologist09 said...
When a higher velocity draft couples with a lower velocity or static air, the resultant movement of the two including the increased movement of the lesser velocity air is effect is called the Venturi effect.
So, for there to be a Venturi effect, you have to have two flows of some sort where one affects the other. But
The Venturi effect is the reduction in fluid pressure that results when a fluid flows through a constricted section of pipe.... The fluid velocity must increase through the constriction to satisfy the equation of continuity, while its pressure must decrease due to conservation of energy: the gain in kinetic energy is balanced by a drop in pressure or a pressure gradient force.
So what you are talking about is not the Venturi effect. That's from Wikipedia, so it might not be exactly right, but it can't be THAT wrong.
The "chimney effect" is more of a confined space or channeled airway and our racks are open and draw cool air from all sides including a 1U or 2U grill at the bottom of all our racks.
I don't see how this is different from what you describe in the first quote. In both cases, you've got some air moving, and some air moving slower, and the moving air draws the non-moving air. Both cases don't mention heat at all, but if they did, chimney effect is indeed a good name for this.
On November 18, 2009 at 15:45, Gizmologist09 said...
I will let the engineers at the Greenbelt, MD facility of NASA (which was our most recent install) that they are wrong as they use the same concept for the same reason in their avionic simulation systems.
Then they were speaking sloppily. You can easily use the same concept for the same reason without using the wrong name.