1. For cardboard drying in a production line, dry air blown across the paper flow is used to
remove moisture from the upper and lower surfaces of the product sheet, whose
concentration is 570 g of water for every 1 kg of cardboard. The local pressure is 1.0 atm and
both air and cardboard are at 131°F. The air velocity is equal to 15.0 m/s and the water vapor
pressure under these conditions is 142.82 mmHg.
a) Determine the Schmidt number;
b) Determine the mean Sherwood number;
c) Determine the value of the mean convective mass transfer coefficient using the total
measure in the direction of flow;
d) Determine the water evaporation rate in g/min;
e) Build a graph with at least 5 points, showing the value of the convection mass transfer
coefficient at each location
f) Determine the convective heat transfer coefficient for this system.
