Water at 20°C enters a 20 mm diameter tube with a flow rate of 0.5 kg/s. The tube wall is maintained at constant temperature of 100°C. Find the average heat transfer coefficient and tube length, if...

Water at 20°C enters a 20 mm diameter tube with a flow rate of 0.5 kg/s. The tube wall is maintained at constant temperature of 100°C. Find the average heat transfer coefficient and tube length, if the outlet temperature of water is 70°C. Assume that the flow is hydro dynamically developed. Take following properties for water—