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Heat and Mass Transfer

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

More
Depends on other factors
Less
Same

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Heat and Mass Transfer
Thermal diffusivity is

A dimensionless parameter
A physical property of the material
Used as mathematical model
Function of temperature

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Heat and Mass Transfer
The expression Q = ρ AT4 is called

Joseph-Stefan equation
Stefan-Boltzmann equation
Fourier equation
Newton Reichmann equation

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Heat and Mass Transfer
The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as

Radiation
Forced convection
Free convection
Conduction

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Heat and Mass Transfer
Heat flows from one body to other when they have

Different atomic structure
Different heat contents
Different specific heat
Different temperatures

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