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HEAT TRANSFER

Heat Transfer
Multiple effect evaporation is generally recommended, when the

Evaporation on small scale is to be done
Corrosive liquids are to be concentrated
Fuel is cheaply available
Large scale evaporation of liquor is needed

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Heat Transfer
For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus-Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of

37
6.1
1.74
1

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Heat Transfer
A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is

6000
60000
48000
24000

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Heat Transfer
Harmonic mean temperature difference is given by

√(ΔT₁ . ΔT₂)
2.(ΔT₁ . ΔT₂)/(ΔT₁ + ΔT₂)
2.(ΔT₁ . ΔT₂)(ΔT₁ - ΔT₂)
(ΔT₁ - ΔT₂)/(ΔT₁ . ΔT₂)

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Heat Transfer
Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer co-efficient is 3k/l. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade?

35.5
43.75
81.25
48.25

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