Hot water (0.01 m³ /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m³/min) of density 800 kg/m³ and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately

Heat Transfer
Hot water (0.01 m³ /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m³/min) of density 800 kg/m³ and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately

45

32

37

50

45

32

37

50

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

Neither A and B

Both A and B

Liquor-film co-efficient

Velocity of circulation

Neither A and B

Both A and B

Liquor-film co-efficient

Velocity of circulation

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Heat Transfer
Heat transfer in the laminar sublayer in case of a liquid flowing through a pipe, is mostly by

Conduction

Convection

None of these

Eddies current

Conduction

Convection

None of these

Eddies current

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Heat Transfer
Economy of a multiple effect evaporator depends upon the

Heat balance consideration

Both A and B

Neither A nor B

Rate of heat transfer

Heat balance consideration

Both A and B

Neither A nor B

Rate of heat transfer

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Heat Transfer
The driving potential for the crystal growth during crystallisation is the __________ of the solution.

Concentration

Super-saturation

Density

Viscosity

Concentration

Super-saturation

Density

Viscosity

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Heat Transfer
For a liquid in laminar flow through a very long tube, when the exit fluid temperature approaches the wall temperature, the equation to be used is

Nu = 0.023 Re0.8 . Pr0.4

Nu = Gz

Nu = 2Gz0.5

Nu = 0.023 Re0.8 . Pr0.4

Nu = Gz

Nu = 2Gz0.5

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Heat Transfer

Heat Transfer Hot water (0.01 m³ /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m³/min) of density 800 kg/m³ and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately

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

Heat Transfer Heat transfer in the laminar sublayer in case of a liquid flowing through a pipe, is mostly by

Heat Transfer Economy of a multiple effect evaporator depends upon the

Heat Transfer The driving potential for the crystal growth during crystallisation is the __________ of the solution.

Heat Transfer For a liquid in laminar flow through a very long tube, when the exit fluid temperature approaches the wall temperature, the equation to be used is

Heat Transfer
Hot water (0.01 m³ /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m³/min) of density 800 kg/m³ and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately

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

Heat Transfer
Heat transfer in the laminar sublayer in case of a liquid flowing through a pipe, is mostly by

Heat Transfer
Economy of a multiple effect evaporator depends upon the

Heat Transfer
The driving potential for the crystal growth during crystallisation is the __________ of the solution.

Heat Transfer
For a liquid in laminar flow through a very long tube, when the exit fluid temperature approaches the wall temperature, the equation to be used is