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

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

Both convection and conduction

Conduction

Radiation

Convection

Both convection and conduction

Conduction

Radiation

Convection

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Heat and Mass Transfer
A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100°C and leaves at 60°C. A cold fluid enters the heat exchanger at 40°C. The mean temperature difference between the two fluids is

40°C

20°C

66.7°C

60°C

40°C

20°C

66.7°C

60°C

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Heat and Mass Transfer
Thermal conductivity of a material may be defined as the

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

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

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

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

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

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

All of these

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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

U/A.Cmin

Cmin/U

U/Cmin

U.Cmin

U/A.Cmin

Cmin/U

U/Cmin

U.Cmin

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Heat and Mass Transfer
Conduction is a process of heat transfer

From one particle of the body to another without the actual motion of the particles

From a hot body to a cold body, in a straight line, without affecting the intervening medium

None of these

From one particle of the body to another by the actual motion of the heated particles

From one particle of the body to another without the actual motion of the particles

From a hot body to a cold body, in a straight line, without affecting the intervening medium

None of these

From one particle of the body to another by the actual motion of the heated particles

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Heat and Mass Transfer
Fourier's law of heat conduction gives the heat flow for

Two dimensional cases only

Nonuniform temperature surfaces

Irregular surfaces

One dimensional cases only

Two dimensional cases only

Nonuniform temperature surfaces

Irregular surfaces

One dimensional cases only

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Heat and Mass Transfer

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

Heat and Mass Transfer Thermal conductivity of a material may be defined as the

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 Conduction is a process of heat transfer

Heat and Mass Transfer Fourier's law of heat conduction gives the heat flow for

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

Heat and Mass Transfer
Thermal conductivity of a material may be defined as the

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
Conduction is a process of heat transfer

Heat and Mass Transfer
Fourier's law of heat conduction gives the heat flow for