Heat Transfer - Engineering

Q1:

The average heat transfer co-efficient for laminar film condensation on vertical surface is inversely proportional to (where, ΔT = Temperature drop across condensate film )

A (ΔT)2

B ΔT

C (ΔT)1/4

D (ΔT)3/2

ANS:C - (ΔT)1/4

The average heat transfer coefficient for laminar film condensation on a vertical surface is inversely proportional to the temperature drop across the condensate film (ΔT) raised to the power of 1/4 (Δ1/4ΔT1/4). Mathematically, it can be represented as: ℎavg∝1()1/4havg​∝(ΔT)1/41​ Therefore, the correct option is: (Δ)1/4(ΔT)1/4.