An industrial process involves the evaporation of water from a liquid film that forms on a contoured surface. Dry air is passed over the surface, and from laboratory measurements the convection heat transfer correlation is of the form Nu L = 0.43 Re:58 Pr0.4
(a) For an air temperature and velocity of 27°C and 10 m/s, respectively, what is the rate of evapora- tion from a surface of 1-m2 area and characteristic length L 1 m? Approximate the density of satu rated vapor as Pasat 0.0077 kg/m3.
(b) What is the steady-state temperature of the liquid film?