Na manufacturing plant that produces cosmetic products, glycerin is being heated by flowing through a 25-mm-diameter and 10-m-long tube. with a mass flow rate of 0.5 kg/s, the flow of glycerin enters the tube at 25°c. the tube surface is maintained at a constant surface temperature of 140°c. determine the outlet mean temperature and the total rate of heat transfer for the tube. evaluate the properties for glycerin at 30°c.