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Heat Transfer

Heat Transfer
At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe?

< 0.5
0.5
< 0.1
> 0.6

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Heat Transfer
Boiling point elevation of an ideal solution

Both B and C
Increases rapidly with temperature rise
In independent of pressure
Decreases rapidly with temperature rise

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Heat Transfer
Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is

L
< 1
>1
0.1

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Heat Transfer
Low thermal conductivity of heat insulating materials is due to its

Dense structure
None of these
High specific heat
High proportion of air space

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Heat Transfer
In pipe flow, heat is transferred from hot wall to the liquid by

Forced convection only
Free and forced convection
Conduction only
Forced convection and conduction

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Heat Transfer
Viscous & heat sensitive liquids are concentrated in __________ evaporators.

Open pan
Long tube
None of these
Agitated film

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