Comparisons of Air and Steam as Veneer Drying Media

Veneer samples of Douglas-fir and southern pine sapwood were dried in air at temperatures of 350, 600, and 7500 F, velocities of 50, 100, and 150 feet per second, and angles of impingement of the drying medium relative to the veneer surfaces of 0, 45, and 90?. Data for the 350 and 600? F operating temperatures were compared in terms of a dimensionless moisture content variable with data obtained by another investigator under similar conditions using steam as the drying medium. Based on times required to dry to a dimensionless moisture content of 10 percent, veneer samples dried about 18 percent faster in air than in steam at 350? F, and about 13 percent faster in steam than in air at 600? F. Drying curves are presented for veneer dried with 90? impingement and with flow parallel-to-grain. Ninety-degree impingement was the most effective angle for drying veneer in this experiment. Heat and mass transfer parameters for the veneer were evaluated.

You must be logged in to download any documents. Please login (login accounts are free) or learn how to Become a Member