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

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

60°C

40°C

20°C

66.7°C

60°C

40°C

20°C

66.7°C

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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

Forced convection

Radiation

Free convection

Conduction

Forced convection

Radiation

Free convection

Conduction

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Heat and Mass Transfer
Thermal conductivity of solid metals with rise in temperature normally

Increases

Remain constant

May increase or decrease depending on temperature

Decreases

Increases

Remain constant

May increase or decrease depending on temperature

Decreases

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Heat and Mass Transfer
The transfer of heat by molecular collision is smallest in

Solids

None of these

Liquids

Gases

Solids

None of these

Liquids

Gases

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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

66.7°C

20°C

40°C

60°C

66.7°C

20°C

40°C

60°C

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
Thermal conductivity of water in general with rise in temperature

Decreases

May increase or decrease depending on temperature

Increases

Remain constant

Decreases

May increase or decrease depending on temperature

Increases

Remain constant

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer

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

Heat and Mass Transfer Thermal conductivity of solid metals with rise in temperature normally

Heat and Mass Transfer The transfer of heat by molecular collision is smallest in

Heat and Mass Transfer Thermal conductivity of water in general with rise in temperature

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

Heat and Mass Transfer
Thermal conductivity of solid metals with rise in temperature normally

Heat and Mass Transfer
The transfer of heat by molecular collision is smallest in

Heat and Mass Transfer
Thermal conductivity of water in general with rise in temperature