Chemical Engineering - Heat Transfer
Exercise : Heat Transfer - Section 8
6.
A tank painted with which of the following coloured paints, would heat up maximum by radiation from sun ?
7.
The separation of liquid droplets from the vapor is done by a/an __________ , in the evaporators.
8.
Fouling factor for a heat exchanger is given by (where, U1 = heat transfer co-efficient of dirty surface U2 = heat transfer co-efficient of clean surface)
U1 - U2
U2 - U1
9.
If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will
10.
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.
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