Physical properties of boiled turmeric rhizomes at different moisture levels

摘要

The physical properties of boiled turmeric rhizomes were determined at the moisture ranges of 369.83 - 10.12 percent (dry basis (d.b.)). The data were fitted to regression equations that described the dependence of physical properties of turmeric rhizomes on moisture content. The length, breadth and thickness of the rhizomes were 76.50, 17.74, 12.29 mm and 49.09, 12.68, 8.91 mm at moisture contents of 369.83 and 10.12 percent (d.b.) respectively. The sphericity of rhizomes was 0.331 and 0.345 at moisture contents of 369.83 percent and 10.12 percent (d.b) respectively. In the moisture range of 369.83 percent and 10.12 percent (d.b.), studies on dried rhizomes showed that the bulk and true densities deereased from 606 to 574 kg/m~3 and from 1633 to1128 kg/m~3 respectively; porosity decreased from 62.92 to 49.08; angle of repose increased form 36.58 to 42.82 deg; static and kinetic cocfficients of friction varied from 0.58 to 0.31 and 0.54 to 0.26 respectively over surfaces of different materials.