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Heat Transfer

Heat Transfer
Peclet number (Pe) is given by

Pe = Re.Pr
Pe = Nu.Re
Pe = Pr/Re
Pe = Re/Pr

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Heat Transfer
In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used

In high range of temperature differences
Because of its low cost
To prevent corrosion of the tube bundles
In low range of temperature differences

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Heat Transfer
In an extended surface heat exchanger, fluid having lower co-efficient

Flows outside the tubes
Flows through the tube
Can flow either inside or outside the tubes
Should not be used as it gives very high pressure drop

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Heat Transfer
Stefan-Boltzman law applies to __________ body

white
black
None of the listed here
grey

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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

37
45
50
32

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Heat Transfer
Heat transfer rate described by Fourier's law will decrease, if the __________ increases.

Heat transfer area
Thickness
Thermal conductivity
Temperature difference

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