Project ForgeHeat Transfer
Convection
GATE 2011
Medium
In film type condensation over a vertical tube, local heat transfer coefficient is
- inversely proportional to local film thickness
- Bdirectly proportional to local film thickness
- Cequal to local film thickness
- Dindependent of local film thickness
Explanation
For conduction across the condensate film, h=k_liquid/δ(x) — the local heat transfer coefficient is inversely proportional to the local film thickness (thicker film = more conduction resistance = lower h).
Source: GATE CH 2011 (2011)
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