Water is boiling on a horizontal tube whose wall temperature is maintained ct 15oC above the saturation temperature of water. Calculate the nucleate boiling heat transfer coefficient.
Assume the water to be at a pressure of 20 atm. And also find the change in value of heat transfer coefficient when
1. The temperature difference is increased to 30oC at a pressure of 10 atm.
2. The pressure is raised to 20 atm at T = 15oC