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Bulk of the convective heat transfer resistance from a hot tube surface to...

Q.  
Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is


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Answer :   Option: C


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Q.  
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. Depends on Reynolds number only


Answer & Explanation

Q.  
At what value of Prandtl number, the hydrodynamic and thermal boundary layers are identical

A. 0.5

B. 1

C. 1.5

D. 80


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Q.  
Thickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is

A. 1

B. <1

C. >1

D. >5


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Q.  
The unit of heat transfer co-efficient in SI unit is

A. J/m2°K

B. W/m2°K

C. W/m°K

D. J/m°K


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