HEAT AND MASS TRANSFER

α = 1, ρ = 0 and τ = 0

α = 0, ρ = 1 and τ = 0

α = 0, ρ = 0 and τ = 1

α + ρ = 1 and τ = 0

black bodies

polished bodies

All of these

all coloured bodies

Quantity of heat flowing in one second through one cm cube of material when opposite faces are maintained at a temperature difference of 1°C

All of these

Quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C

Heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces

Reflects all heat

Transmits all heat radiations

Absorbs heat radiations of all wave lengths falling on it

Is black in colour

Thickness of film of fluid to the temperature drop through the films of fluids

Thickness of film of fluid to the thermal conductivity

Thermal conductivity to the equivalent thickness of the film of fluid

Temperature drop through the films of fluids to the thickness of film of fluids