Sun-dried and later harvested hay needed less drying time. The order of the drying time from the fastest to the slowest was flowers, leaves, then stems. Flowers, leaves, and stems needed varying drying times to reach their equilibrium moisture contents. Sun-drying on field could decrease more than half of the moisture content of the harvested fresh hay. Moisture content of the fresh hay decreased with the increase of growth time. Moisture content of the fresh buckwheat flower was 0.777 to 1.633 (decimal dry basis), and fresh stems had a maximum moisture content of 5.64. The drying behavior of flowers, leaves, and stems of the fresh and sun-dried hay was characterized. Half of the harvested hay was sun-dried on the field for 4 d (referred to as sun-dried hay). The hay was harvested on three different times with a 10 to 12 d interval between the harvesting times. Thin-layer drying characteristics of fresh and sun-dried buckwheat hay were studied at 30☌ to 180☌, 12.5 to 60% relative humidities, and 0.2 m/s constant air velocity. The D eff values of fresh flowers, leaves, and stems ranged from 1.4x10 -10 to 60x10 -10 m 2/s.Ībstract. Partial sun-drying of the hay could reduce drying time by 50%. Thin-layer drying of fresh and sun-dried buckwheat hay was studied at 30☌ to 180☌ and 12.5% to 60% relative humidities.īuckwheat hay drying occurred in the falling-rate period. Keywords: Activation energy, Combination drying, Hay drying, Thin-layer drying, Water diffusivity. Joseph, Michigan Citation: Applied Engineering in Agriculture. 37(4): 713-724. (doi: 10.13031/aea.14609) Fuji Jian, Dr., Mehul Patil, Mr., Digvir S. Published by the American Society of Agricultural and Biological Engineers, St. Thin-Layer Drying Characteristics of Fresh and Sun-Dried Buckwheat Hay If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options. Click on “Download PDF” for the PDF version or on the title for the HTML version.
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