When does the heat generated by fluid friction becomes appreciable compared to the heat transferred between the fluids?

Heat Transfer
When does the heat generated by fluid friction becomes appreciable compared to the heat transferred between the fluids?

At high fluid velocity

When fluid flows past a smooth surface

At low velocity

None of these

At high fluid velocity

When fluid flows past a smooth surface

At low velocity

None of these

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Heat Transfer
In case of a vertical tube evaporator, with increase in the liquor level, the __________ is increased.

Velocity of circulation

Liquor-film co-efficient

Both A and B

Neither A and B

Velocity of circulation

Liquor-film co-efficient

Both A and B

Neither A and B

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Heat Transfer
In a gas-liquid shell and tube heat exchanger, the

All of these

Gases under high pressure are routed through the tube side, because high pressure gases are corrosive in nature

Presence of a non-condensible gas decreases the condensing film co-efficient

Gases to be heated/cooled is normally routed through the shell side, because the corrosion caused by the cooling water or steam condensate remain localised to the tubes

All of these

Gases under high pressure are routed through the tube side, because high pressure gases are corrosive in nature

Presence of a non-condensible gas decreases the condensing film co-efficient

Gases to be heated/cooled is normally routed through the shell side, because the corrosion caused by the cooling water or steam condensate remain localised to the tubes

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Heat Transfer
Water is normally used as a coolant in the heat exchange equipments mainly because ofits

Low viscosity

Abundance & high heat capacity

Low density

High fluidity

Low viscosity

Abundance & high heat capacity

Low density

High fluidity

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Heat Transfer
The unit of heat transfer co-efficient in SI unit is

W/m2°K

J/M2°K

W/m°K

J/m°K

W/m2°K

J/M2°K

W/m°K

J/m°K

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Heat Transfer
Log mean temperature difference (LMTD) cannot be used, if

the heat capacity is not constant and there is a phase change.

none of the listed here

heat transfer co-efficient over the entire heat exchanger is not constant

there exists an unsteady state

the heat capacity is not constant and there is a phase change.

none of the listed here

heat transfer co-efficient over the entire heat exchanger is not constant

there exists an unsteady state

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Heat Transfer

Heat Transfer When does the heat generated by fluid friction becomes appreciable compared to the heat transferred between the fluids?

Heat Transfer In case of a vertical tube evaporator, with increase in the liquor level, the __________ is increased.

Heat Transfer In a gas-liquid shell and tube heat exchanger, the

Heat Transfer Water is normally used as a coolant in the heat exchange equipments mainly because ofits

Heat Transfer The unit of heat transfer co-efficient in SI unit is

Heat Transfer Log mean temperature difference (LMTD) cannot be used, if

Heat Transfer
When does the heat generated by fluid friction becomes appreciable compared to the heat transferred between the fluids?

Heat Transfer
In case of a vertical tube evaporator, with increase in the liquor level, the __________ is increased.

Heat Transfer
In a gas-liquid shell and tube heat exchanger, the

Heat Transfer
Water is normally used as a coolant in the heat exchange equipments mainly because ofits

Heat Transfer
The unit of heat transfer co-efficient in SI unit is

Heat Transfer
Log mean temperature difference (LMTD) cannot be used, if