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Heat and Mass Transfer

Heat and Mass Transfer
Log mean temperature difference in case of counter flow compared to parallel flow will be

Same
Depends on other factors
Less
More

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Heat and Mass Transfer
Thermal diffusivity is a

Function of temperature
Dimensionless parameter
Physical property of a substance
All of these

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Heat and Mass Transfer
According to Stefan's law, the total radiation from a black body per second per unit area is proportional to

T2
Absolute temperature
T5
T

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Heat and Mass Transfer
The heat transfer by conduction through a thick sphere is given by

Q = 8πkr1 r2 (T1 - T2)/ (r2 - r1)
Q = 6πkr1 r2 (T1 - T2)/ (r2 - r1)
Q = 2πkr1 r2 (T1 - T2)/ (r2 - r1)
Q = 4πkr1 r2 (T1 - T2)/ (r2 - r1)

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Heat and Mass Transfer
Depending on the radiating properties, a body will be white when(Where a = absorptivity, p = reflectivity, x = transmissivity)

P = 0, x = 1 and a = 0
P=1, T = 0 and a = 0
P = 0, x = 0 and a = 1
X = 0, a + p = 1

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Heat and Mass Transfer
An ordinary passenger aircraft requires a cooling system of capacity.

2 TR
4 TR
10 TR
8 TR

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