The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m².K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m².K. The overall heat transfer co-efficient at this time is

Heat Transfer
The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m².K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m².K. The overall heat transfer co-efficient at this time is

894W/m².K

333W/m².K

287 W/m².K

1200W/m².K

894W/m².K

333W/m².K

287 W/m².K

1200W/m².K

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Heat Transfer
Corrosiveness of steam condensate is due to the presence of

CO₂

Both A & B

Dissolved O₂

Neither A nor B

CO₂

Both A & B

Dissolved O₂

Neither A nor B

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Heat Transfer
Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is

Mainly confined to a thin film of fluid near the surface

None of these

In the central core of the fluid

Uniformly distributed throughout the fluid

Mainly confined to a thin film of fluid near the surface

None of these

In the central core of the fluid

Uniformly distributed throughout the fluid

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Heat Transfer
The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness)

∝ t

∝ √t

∝ 1/t

Independent of 't'

∝ t

∝ √t

∝ 1/t

Independent of 't'

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Heat Transfer
Calburn analogy is applicable for the value of Prandtl number from

0.5 to 5

120 to 400

0.6 to 120

0.001 to 1

0.5 to 5

120 to 400

0.6 to 120

0.001 to 1

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Heat Transfer
Vacuum is generally maintained in the vapour space of an evaporator mainly to

Facilitate forward feeding in multiple effect evaporation

Concentrate heat sensitive materials

Achieve very high concentration of the final product

Get economical temperature difference by using moderate pressure steam

Facilitate forward feeding in multiple effect evaporation

Concentrate heat sensitive materials

Achieve very high concentration of the final product

Get economical temperature difference by using moderate pressure steam

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Heat Transfer

Heat Transfer The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m².K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m².K. The overall heat transfer co-efficient at this time is

Heat Transfer Corrosiveness of steam condensate is due to the presence of

Heat Transfer Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is

Heat Transfer The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness)

Heat Transfer Calburn analogy is applicable for the value of Prandtl number from

Heat Transfer Vacuum is generally maintained in the vapour space of an evaporator mainly to

Heat Transfer
The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m².K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m².K. The overall heat transfer co-efficient at this time is

Heat Transfer
Corrosiveness of steam condensate is due to the presence of

Heat Transfer
Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is

Heat Transfer
The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness)

Heat Transfer
Calburn analogy is applicable for the value of Prandtl number from

Heat Transfer
Vacuum is generally maintained in the vapour space of an evaporator mainly to