Question

In desert climates, rainfall is not a common occurrence since the rain droplets formed in the upper layer of the atmosphere often evaporate before they reach the ground. Consider a raindrop that is initially at a temperature of 5c and has a diameter of 5 mm. Determine how long it will take for the diameter of the raindrop to reduce to 3 mm as it falls through ambient air at 18c with a heat transfer coefficient of 400 w/m2
c. The water temperature can be assumed to remain constant and uniform at 5 c at all times

Answer 1

Explanation:

the water temperature can be assumed to remain constant and uniform at 5c at all times