The non-dimensional temperature gradient in a liquid at the wall of a pipe is the

Heat Transfer
The non-dimensional temperature gradient in a liquid at the wall of a pipe is the

Schmidt number

Heat flux

Prandtl number

Nusselt number

Schmidt number

Heat flux

Prandtl number

Nusselt number

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Heat Transfer
Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m² .°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the

Lower pressure drop through the exchanger is desired

Higher condensing film co-efficient is desired

Temperature of the incoming vapor is very high

Condensate is corrosive in nature

Lower pressure drop through the exchanger is desired

Higher condensing film co-efficient is desired

Temperature of the incoming vapor is very high

Condensate is corrosive in nature

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Heat Transfer
For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus-Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of

6.1

1

37

1.74

6.1

1

37

1.74

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Heat Transfer
In which mode of heat transfer, the Biot number is important?

Transient heat conduction

Forced convection

Natural convection

Radiation

Transient heat conduction

Forced convection

Natural convection

Radiation

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Heat Transfer
In a shell and tube heat exchanger, the shell side fluid velocity can not be changed by changing the

Tube pitch

Tube layout

Tube diameter

No. of baffles

Tube pitch

Tube layout

Tube diameter

No. of baffles

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Heat Transfer
A steel sphere of radius 0.1 m at 400°K is immersed in an oil at 300°K. If the centre of the sphere reaches 350°K in 20 minutes, how long will it take for a 0.05 m radius steel sphere to reach the same temperature (at the centre) under identical conditions ? Assume that the conductive heat transfer co-efficient is infinitely large.

20 minutes

10 minutes

5 minutes

40 minutes

20 minutes

10 minutes

5 minutes

40 minutes

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Heat Transfer

Heat Transfer The non-dimensional temperature gradient in a liquid at the wall of a pipe is the

Heat Transfer Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m² .°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the

Heat Transfer For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus-Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of

Heat Transfer In which mode of heat transfer, the Biot number is important?

Heat Transfer In a shell and tube heat exchanger, the shell side fluid velocity can not be changed by changing the

Heat Transfer
The non-dimensional temperature gradient in a liquid at the wall of a pipe is the

Heat Transfer
Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m² .°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the

Heat Transfer
For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus-Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of

Heat Transfer
In which mode of heat transfer, the Biot number is important?

Heat Transfer
In a shell and tube heat exchanger, the shell side fluid velocity can not be changed by changing the