Effect of Stirring on the Transpiration Drying of Wood Chips.

Miyata D., Suzuki Y., Kobatake A., Gotou J., Itai T, Masaoka T., Yoshii J.

doi:10.4005/jjfs.90.75

Periodical stirring is supposed to be an effective method for enhancing transpiration drying of wood chips. An experiment to evaluate the effect of periodical stirring was conducted using container boxes filled with wood chips to a depth of 60 cm. The experiment was carried out at three sites, an outdoor site without shelter from the rain, an indoor site, and a greenhouse site, for 98 days. The enhancement of transpiration drying attributable to weekly stirring of chips was highly significant; chips at the outdoor site that had been stirred exhibited a higher drying rate than the indoor chips that had not been stirred and the indoor chips that had been stirred exhibited a higher drying rate than the greenhouse chips that had not been stirred. Significant transpiration drying was observed up to 10 cm depth despite the lack of stirring. It seems that transpiration drying occurred mainly during the time of stirring because a direct exchange of water content between wet and dry chips was not observed and the drying rate of the stirred chips regardless of depth was observed to be higher than that of non-stirred chips that were deeper than 5 cm. The effect of stirring was estimated to be equivalent to that of a wind blowing with a velocity of 2.8 to 4.6 m/s.

Effect of Stirring on the Transpiration Drying of Wood Chips.

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