Auxiliary cooling Oil cooling Radial fan standa B4-DV24-B Bevel-helical gear Reduction Boxes B4

Flender/Flender Gear Units/Bevel-helical gear Reduction Boxes B4

under normal storage conditions when 2levels are reduced, relative humidity is lower than 9%, and successive genera- tions of isolated populations would not be exposed to CO 2. Selection also resulted in slight resistance to low- 2environments (Donahaye, 1b). 8 PHYSICAL ASPECTS OF CO 2FUMIGATION 8.1 Diffusion of CO 2Through Bulk Grain The determination of the diffusion coefcient of one gas through another gas or one gas through interspaces of granular materials is frequently required in many engineering appli-cations. new transient method to determine diffusion coefcient was developed. Themethod has been applied to determine the diffusion coefcient of CO 2through wheat bulks. The newly determined diffusion coefcient, 4.1 mm2/, compares well with the previously published value, 4.1 mm2/, considering the possible differences in this bio- logically and physically variable material (Singh, Jayas et al., . The diffusion coefcient of carbon dioxide through barley bulks was determined using transient method at three grain moisture contents (1.5, 1.0, and 1% wet massbasis), three temperatures (1 ,2 5, and 4 ), two porosities (4 and 5%), two direc- tions of gas ow (upward and downward), two kernel orientations (horizontal and vertical),and three initial gas concentrations (2, 4, and 6%). The diffusion equation was solved using CrankNicolsons implicit nite difference method. The diffusion coefcient of CO 2through barley bulks was in the range of 5.0.3 mm2/. The diffusion coefcient decreased with increases in temperature and porosity. The diffusion coefcient was greaterfor downward ow than for upward ow and was greater for ow parallel to the majoraxes of the kernels (horizontal) than ow perpendicular to the major axes of the kernels(vertical). The diffusion coefcient did not change with initial gas concentration (Shunmu- gam et al., . 8.2 Convective Pore Velocity of CO The phenomena that affect transport of CO 2include natural convection, diffusion, sorption (adsorpt