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Heat Transfer

Heat Transfer
Open pan evaporators are preferred to be used, when the solution to be concentrated is

Scaling
Corrosive
Highly viscous
Salty

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Heat Transfer
Grashhoff number is given by

gD³βΔtP²/μ
gD2βΔtρ/μ²
gD³.β.Δtρ²/μ²
gD2βΔtP²μ

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Heat Transfer
Electromagnetic radiations propagate in vacuum with a velocity of __________ metre/second.

3 x l010
3 x l08
3 x l05
3 x l012

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Heat Transfer
What is the steam economy in case of a single effect evaporator system?

1
>1
0.1
< 1

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Heat Transfer
In the free convection regime of pool boiling, the heat flux is proportional to

Δt1/2
Δt2
Δt5/4
Δt

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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

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

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