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Heat and Mass Transfer

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

4 TR
2 TR
10 TR
8 TR

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Heat and Mass Transfer
The concept of overall coefficient of heat transfer is used in heat transfer problems of

Conduction
Convection
Conduction and convection
Radiation

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Heat and Mass Transfer
According to Dalton's law of partial pressures, (where pb = Barometric pressure, pa = Partial pressure of dry air, and pv = Partial pressure of water vapour)

Pb = pa × pv
Pb = pa - pv
Pb = pa + pv
Pb = pa/pv

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

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

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Heat and Mass Transfer
In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by

Conduction
Both convection and conduction
Convection
Radiation

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Heat and Mass Transfer
Unit of thermal diffusivity is

m²/hr °C
kcal/m² hr
kcal/m. hr °C
m²/hr

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