Influence of some anatomical structure and physical properties on the drying rates of selected industrial tree plantation species
1995
Deomano, E.D.C.
Three trees of each Kaatoan bangkal [Anthocephalus chinensis Lamk) Rich. ex. Walp], rubberwood [Hevea brasiliensis (HBK) Muell. - Arg], yemane (Gmelina arborea R. Br.) and coconut (Cocos nucifera L.) were studied. Samples representing three height levels, two segments and two transverse directions were prepared for determination of drying time. Two radii were randomly selected for measurements of fiber, vessel, intervascular pitting, specific gravity, and initial moisture content. There were significant differences in drying time between species, along the height, segment and direction. Measurements of some anatomical structures and physical properties were correlated with drying time. Mathematical models were derived for the prediction of drying time. Stepwise regression showed the coefficients of determination to be 0.788 and 0.597 for hardwood and coconut, respectively. Equations are presented which may be used for prediction purposes of drying time (in hours) from green to about 10.00 percent MC when dried under a constant condition of 65.6 deg C (150 deg F) dry-bulb temperature (DBT) and 62.2 deg C (144 deg F) wet-bulb temperature (WBT)
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