The film thickness for laminar film condensation on vertical surface _____________ from top to bottom?
Correct answer: D. Cumulatively increases
- A. And the surface conductance increase
- B. Cumulatively decreases
- C. Remain constant
- D. Cumulatively increases
Explanation
Condensate formed at the top flows downward and joins the condensate already present, so the laminar film becomes cumulatively thicker from top to bottom. The increased thickness also raises thermal resistance and lowers the local surface conductance.
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