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Heat and Mass Transfer

Heat and Mass Transfer
Stefan Boltzmann law is applicable for heat transfer by

Conduction
Convection
Radiation
Conduction and radiation combined

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Heat and Mass Transfer
The thermal diffusivities for gases are generally

More than those for liquids
More than those for solids
Dependent on the viscosity
Less than those for liquids

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Heat and Mass Transfer
Fouling factor is used

In case of Newtonian fluids
When a liquid exchanges heat with a gas
In heat exchanger design as a safety factor
None of these

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Heat and Mass Transfer
The unit of Stefan Boltzmann constant is

watt/cm2 °K⁴
watt/cm3 °K
watt/cm4 °K
watt2/cm °K⁴

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Heat and Mass Transfer
When heat is transferred from hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by

Conduction and convection
Conduction
Radiation
Convection

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Heat and Mass Transfer
Unit of thermal conductivity in M.K.S. units is

K calm/hr °C
K cal m/hr m² °C
K cal/kg m² °C
K cal/hr m² °C

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