Mechanical Engineering > GATE 2024 > Convection
Consider a hydrodynamically fully developed laminar flow through a circular pipe with the flow along the axis (i.e., z direction). In the following statements, 1 T is the temperature of the fluid, 2 Tw is the wall temperature and Tm is the bulk mean temperature of the fluid. Which one of the following statements is TRUE?
A
For a thermally fully developed flow, 𝜕𝑇 𝜕𝑧 = 0, always.
B
For constant wall temperature of the duct, dTm/dz = constant.
C
For constant wall temperature (Tw > Tm) of the duct, dTm/dz increases exponentially with distance along z direction. * Nusselt number varies linearly along the z direction for a thermally fully developed flow.
D
Nusselt number varies linearly along the z direction for a thermally fully developed flow.

Explanation

Correct : b

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