Heat Transfer

Q1: Heat transfer co-efficient (h) for a fluid flowing inside a clean pipe is given by
This is valid for the value of N_Re equal to

A < 2100

B 2100-4000

C > 4000

D > 10000

ANS:D - > 10000

The heat transfer coefficient (ℎh) for a fluid flowing inside a clean pipe is typically given by the Dittus-Boelter equation: ℎ=4(0.023⋅)0.8h=4k⋅D(0.023⋅DNRe⋅Pr)0.8 Where:

ℎh is the heat transfer coefficient (W/m²·K),
k is the thermal conductivity of the fluid (W/m·K),
D is the diameter of the pipe (m),
NRe is the Reynolds number of the flow (dimensionless),
Pr is the Prandtl number of the fluid (dimensionless).

This equation is valid for turbulent flow inside a clean pipe, where the Reynolds number (NRe) is typically greater than 4000. So, the correct answer is: >4000NRe>4000.

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