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Heat Transfer - Engineering

Q1:

The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is

A 2.36

B 4.36

C 120.36

D dependent on NRe only

ANS:B - 4.36

The Nusselt number for fully developed laminar flow through a circular pipe with constant wall heat flux is a well-known correlation. It is given by: Nu=3.66 This correlation is valid for the range of Reynolds numbers typical of laminar flow. Therefore, the correct answer is: b) 3.66