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.

Correct : b

Similar Questions

Consider incompressible laminar flow over a flat plate with freestream velocity of u∞. The Nusselt number corresponding to this flow velocity is Nu1. If the fre...
#175 MCQ
For laminar forced convection over a flat plate, if the free stream velocity increases by a factor of 2, the average heat transfer coefficient
#439 MCQ
Water (specific heat, cp = 4.18 kJ/kgK) enters a pipe at a rate of 0.01 kg/s and a temperature of 20°C. The pipe, of diameter 50 mm and length 3 m, is subjected...
#804 MCQ

Related Topics

No tags found

Unique Visitor Count

Total Unique Visitors

Loading......

Question Options

Contributed by: