GATE ME 2023 Set 1 — Question 21
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Heat Transfer → Convection → Flat Plate & Pipe Correlations
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Question
Consider incompressible laminar flow of a constant property Newtonian fluid in an isothermal circular tube. The flow is steady with fully-developed temperature and velocity profiles. The Nusselt number for this flow depends on
Correct answer
(A) neither the Reynolds number nor the Prandtl number
Solution
For fully developed laminar flow in a circular tube with constant surface temperature (isothermal), the Nusselt number is a constant value: . It does not depend on the Reynolds number () or the Prandtl number ().
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