Effect of Kiln Air Velocity At Various Moisture Content Levels on Drying Rate of 4 By 4 Yellow-Poplar Sapwood

Sapwood of green 4/4 yellow-poplar (Liriodendron tulipifera L.) was kiln dried, using a conventional drying schedule. Air velocity was varied between runs, over a range of 250 to 750 ft/min, as measured between the board layers. For a sequence of moisture content ranges and air velocities drying rates of individual sample boards were recorded and adjusted to a common specific gravity of 0.46, ovendry volume basis. Applying Scheffe’s test of significance of all differences among means at the 0.01 and the 0.05 level, a statistically significant effect of air velocity on mean drying rate was detected only at moisture contents above 40 percent and when air velocity was altered at least in the magnitude of about 300 ft./min. Between 70 and 40 percent moisture content, drying rate varied with air velocity. The standard deviation of the individual data was extensive. The results apply to the air-intake side of a stack.

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