Chemical Engineering - Heat Transfer
Exercise : Heat Transfer - Section 7
36.
The advantage of backward feed multiple effect evaporators over forward feed units is that
37.
Which of the following is the most controlling factor for the rate of bubble detachment from the hot solid surface ?
38.
Which characteristic of a fluid is not important in deciding its route in a shell and tube heat exchanger ?
39.
Thermal conductivities of most of the liquids __________ with rise in temperature.
40.
A metal ball of radius 0.1 m at a uniform temperature of 90°C is left in air at 30°C. The density and the specific heat of the metal are 3000 kg/m3 and 0.4 kJ/kg.K respectively. The heat transfer co-efficient is 50 W/m2.K Neglecting the temperature gradients inside the ball, the time taken (in hours) for the ball to cool to 60°C is
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