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Heat Transfer

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

> 1
< 1
> 5
1

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Heat Transfer
Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)

0.2 D
0.3 D
0.4 D
0.5 D

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Heat Transfer
jH factor for heat transfer is not a function of the __________ number.

Both B & C
Nusselt
Reynolds
Grashoff

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Heat Transfer
The purpose of providing expansion bellows in the shell of tubular exchanger is to

Facilitate increase of shell length, if needed
Increase the heating load
Impart structural strength
Account for the uneven expansion of shell and tube bundles

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Heat Transfer
For hot feed, forward feeding as compared to backward feeding results in __________ economy.

Increased
No effect on
None of these
Decreased

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Heat Transfer
As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient

continues to decrease
goes through a minimum
goes through a maximum.
continues to increase

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