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Heat Transfer

Heat Transfer
The unit of heat transfer co-efficient in SI unit is

J/m°K
W/m2°K
J/M2°K
W/m°K

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Heat Transfer
In forced convection, the Nusselt number is a function of

Pr and Gr
Re and Gr
Re and Sc
Re and Pr

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Heat Transfer
Overall heat transfer co-efficient for cooling of hydrocarbons by water is about

50 -100 Kcal/hr.m².°C
50 -100 W/m² . °K
1000 - 1500 BTU/hr. ft.2°F
50 -100 BTU/hr. ft.2°F

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Heat Transfer
The average heat transfer co-efficient for laminar film condensation on vertical surface is inversely proportional to (where, ΔT = Temperature drop across condensate film )

ΔT
None of the listed here
(ΔT)2
(ΔT)1/4

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Heat Transfer
For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally

Increases
Remains unchanged
Decreases
Increases exponentially

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Heat Transfer
Solid angle subtended by the finite surface at the radiating element is

proportional to the square of the distance between surfaces
expressed in terms of radians
called the view factor.
called the angle of vision

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