A vertically positioned pipe with a diameter of 40 mm is being cooled by spraying water on its outer surface. As a result of the sprayed water, a water film with a thickness of 2 mm forms on the outer surface of the pipe. The stagnant air in which the pipe is located has a relative humidity of 50%. It can be assumed that the temperature on the surface of the water film is the same as the air temperature and is 25C. If the resistance to mass transfer in a 10 mm thick air film outside the water film controls the cooling rate, calculate ky, kg, and ky' for water vapor.

Data: Total pressure is 1 atm, vapor pressure of water at 25C is 23.756 mmHg, DAB=2.56x10-5 m2/s at 1 atm and 25C.