A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

Heat and Mass Transfer
A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

Cmin/U

U/Cmin

U/A.Cmin

U.Cmin

Cmin/U

U/Cmin

U/A.Cmin

U.Cmin

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Heat and Mass Transfer
Planck’s law holds good for

polished bodies

All of these

black bodies

all coloured bodies

polished bodies

All of these

black bodies

all coloured bodies

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Heat and Mass Transfer
In counter flow heat exchangers

Both the fluids at inlet (of heat exchanger where hot fluid enters) are in their coldest state

One fluid is in hottest state and other in coldest state at inlet

Both the fluids at inlet are in their hottest state

Both the fluids at exit are in their hottest state

Both the fluids at inlet (of heat exchanger where hot fluid enters) are in their coldest state

One fluid is in hottest state and other in coldest state at inlet

Both the fluids at inlet are in their hottest state

Both the fluids at exit are in their hottest state

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Heat and Mass Transfer
Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

RN = ρ V l /μ

RN = V²/t.cp

RN = hl/k

RN = μ cp/k

RN = ρ V l /μ

RN = V²/t.cp

RN = hl/k

RN = μ cp/k

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Heat and Mass Transfer
Thermal conductivity of air with rise in temperature

Decreases

Increases

Remain constant

May increase or decrease depending on temperature

Decreases

Increases

Remain constant

May increase or decrease depending on temperature

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Heat and Mass Transfer
Heat transfer by radiation mainly depends upon

All of these

Its temperature

Nature of the body

Kind and extent of its surface

All of these

Its temperature

Nature of the body

Kind and extent of its surface

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Heat and Mass Transfer

Heat and Mass Transfer A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

Heat and Mass Transfer Planck’s law holds good for

Heat and Mass Transfer In counter flow heat exchangers

Heat and Mass Transfer Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

Heat and Mass Transfer Thermal conductivity of air with rise in temperature

Heat and Mass Transfer Heat transfer by radiation mainly depends upon

Heat and Mass Transfer
A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

Heat and Mass Transfer
Planck’s law holds good for

Heat and Mass Transfer
In counter flow heat exchangers

Heat and Mass Transfer
Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

Heat and Mass Transfer
Thermal conductivity of air with rise in temperature

Heat and Mass Transfer
Heat transfer by radiation mainly depends upon