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Heat Transfer

Heat Transfer
What is the unit of thermal conductivity ?

Kcal/hr.m.°C
Kcal/hr. m² °C
Kcal/hr. °C
Kcal/hr.m

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Heat Transfer
In case of evaporators, liquid entrainment results primarily due to

high heat transfer rate
high heat transfer rate
foaming of the solution
high vacuum in the evaporator

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Heat Transfer
Maximum heat transfer rate is achieved in __________ flow.

Laminar
Counter-current
Turbulent
Co-current

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Heat Transfer
Reynold's analogy states that (where, St = Stanton number f = friction factor)

St = f1/2
St = 4f
St = f/4
St = f/2

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Heat Transfer
Vibrations in the tubes of a shell and tube heat exchanger is induced due to the

Oscillations in the flow of shell/tube sides fluid
Vibrations transmitted through piping and/or supports due to external reasons
All of these
Flow of fluid on the tube and shell sides

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Heat Transfer
Log mean temperature difference (LMTD) cannot be used, if

none of the listed here
heat transfer co-efficient over the entire heat exchanger is not constant
the heat capacity is not constant and there is a phase change.
there exists an unsteady state

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