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Heat Transfer

Heat Transfer
Steam side heat transfer co-efficient in an evaporator is in the range of __________ kcal/hr.m²°C.

18537
100-500
5000-15000
1000-1500

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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

< 1
L
>1
0.1

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Heat Transfer
The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m².K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m².K. The overall heat transfer co-efficient at this time is

1200W/m².K
333W/m².K
894W/m².K
287 W/m².K

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Heat Transfer
The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is

3.66
1.66
88.66
Dependent on NRe only

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Heat Transfer
Kg of liquid evaporated per hour in an evaporator is defined as its

None of these
Steam load
Capacity
Economy

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

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

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