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Heat Transfer

Heat Transfer
In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always

∞
> 1
< 1
1

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Heat Transfer
Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is

0.6
0.4
0.8
0.2

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Heat Transfer
At constant temperature, the thermal conductivities of gases __________ with rise in pressure.

Decrease
May increase or decrease; depends on the pressure
Increase
Remain unchanged

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Heat Transfer
The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is

120.36
2.36
4.36
Dependent on NRe only

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Heat Transfer
The value of Stefan-Boltazman constant in SI unit is

5.6697 x 10-8W/m².°K4
0.1714 x 10-8W/m².°K4
0.1714 x 10-8kcal/m². °K4
5.6697 x 10-8kcal/m² . °K4

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Heat Transfer
Which of the following has the minimum absorptivity?

Coal dust
Aluminium foil
Iron plates
Refractory bricks

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