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Originally Posted by Cathar
Les, when stating h, and the area associated with it, what are you defining as the area? The area of the heat source? The convectional area? The "net effective" convectional area?
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Would describe as the average h within a distance of d/5(ish) of a vectorial(terminology?) change in velocity.
Edit. In the WW case the considered area is within d/5(ish, ish) of the die area.
Would tentatively suggest that Impingement is only a special case of a vectorial change in coolant velocity.