Question: 1. Dry air at 315°C flows along a flat wet surface (water) at 9 m/s. The pressure is 1 atm. If the surface is insulated (except for exposure to the air) and radiation is neglected, what equilibrium temperature will the surface assume? If the boundary layer is turbulent, what is the masstransfer rate at a point 1.5 m from the virtual origin of the boundary layer?
2. A thin plate of solid salt (NaCl), 15em by 15em, is to be dragged through seawater (edgewise) at 20°C at a velocity of 5 m/s. Seawater has a salt concentration of about 3 percent by weight. Saturated NaCI-H2O at 20°C has a concentration of 36 g NaCl/100 g H2O. Estimate the total rate at which salt goes into solution.