Wetting perimeter problem in heat transfer
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It’s page 157 of the TianDa professional version; the dimensions of the vertical plate are both 0.4m. Why is the value for the wetted perimeter 0.4*2, rather than (0.4+0.4)*2? Could experts give some hints? Thank you!
The book is wrong. What you wrote is correct; believe in yourself! d (equivalent) = A/PAI = 0.4*0.4/(0.4*4) = 0.1 m
Expert, could it be that the condensation on the flat surface is different? Imagine that as the condensate flows down from the flat surface, its ability to wet the surrounding area depends only on the top and bottom surfaces, and not on the left and right sides?
I agree; I’m confused too! Only consider the flow from top to bottom; are only the left and right sides considered as the boundaries, while the top and bottom are not taken into account?
This problem is interesting; please keep working on it!