Problems: Forced Convective Heat Transfer Chemical Engineering Notes | EduRev

Heat Transfer for Engg.

Chemical Engineering : Problems: Forced Convective Heat Transfer Chemical Engineering Notes | EduRev

The document Problems: Forced Convective Heat Transfer Chemical Engineering Notes | EduRev is a part of the Chemical Engineering Course Heat Transfer for Engg..
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Frequently Asked Questions and Problems for Practice

Q.1What is the local Reynolds number?
Q.2

What are the important dimensionless groups in heat transfer? Explain their physical significance.

Q.3What is the difference between Reynolds and Prandtl anologies?
Q.4Explain why there is more heat transfer in forced convection as compared to natural convection.
Q.5What is Dittus-Boelter equation and when is it applied?
Q.6Water is to be heated from 50oC to 100oC in a smooth hot pipe. The pipe is maintained at a constant temperature above 30oC that of bulk water temperature under the condition of constant heat flux. Calculate the length of the pipe required for heating, if the tube diameter is 0.6 m and the Reynolds number of the water inside the pipe is 95000? 
Q.7

A tube bank having a square array of 100 tubes arranged in an in-line position is at 100oC. The diameter and length of the tubes are 15 mm and 100 cm, centre to centre tube spacing is 20 mm. Atmospheric air enters in the tube bank at 25oC and at the free stream velocity of 5.5 m/s. Determine the total heat loss by the tubes.

Q.8

Water at 15oC flow past a sphere at the free stream velocity of 4 m/s. The diameter and temperature of the sphere are 30 mm and 70oC, respectively. Calculate the heat loss by the sphere.

Q.9Atmospheric air flows at 10 m/s of free stream velocity in a rectangular duct having dimensions of 25 cm by 50 cm. The air and wall temperature of the duct are 25 oC and 50 oC, respectively. Calculate the mean exit temperature of the air per unit length of the duct.
Q.10Air at 25 oC flows in a 10 mm diameter tube at a Reynolds number of 50,000. If the length of the tube is 100 cm, estimate the average heat transfer coefficient for a constant heat flux at the wall.
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