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Heat Transfer

Heat Transfer
According to Reynolds analogy, Stanton number is equal to

f/2
f
2f
f/4

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Heat Transfer
The Sieder-Tate correlation for heat transfer in turbulent flow in pipe gives Nu α Re0.8, where, Nu is the Nusselt number and Re is the Reynolds number for the flow. Assuming that this relation is valid, the heat transfer co-efficient varies with the pipe diameter (D) as

(D)0.2
(D)-0.2
(D)1.8
(D)-1.8

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Heat Transfer
In a heat exchanger with steam outside the tubes, a liquid gets heated to 45°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining the same, the temperature of the exit liquid will be

More than 45°C
Initially decreases and remains constant thereafter
Less than 45°C
Equal to 45°C

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Heat Transfer
Which of the following has the minimum absorptivity?

Refractory bricks
Coal dust
Iron plates
Aluminium foil

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Heat Transfer
Evaporator tubes are generally

Random
Horizontal
Vertical
Inclined

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Heat Transfer
Agitated film evaporator is suitable for concentrating __________ liquids.

Corrosive
Foaming
Very thin
Viscous

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