A Study of Friction Characteristics of Different Variety Watermelon Seed At Different Moisture Content

37th International Symposium of Agricultural Engineering -- FEB 10-13, 2009 -- Opatija, CROATIAWOS: 000266236400041Art experimental arrangement was developed to determine the static and dynamic coefficient of friction of two varieties of watermelon seed (crimson sweet, galaxy and shimal FI). The static and dynamic friction against three surfaces (galvanized steel, plywood and rubber sheet) were measured at a moisture range from 4.12 to 49.25, from 4.97 to 44.62 and 4,08 to 42.33 % (w.b.) for Crimson sweet, Galaxy, and Shimal FI, respectively. Knowledge of the coefficient of friction of seeds is useful in the design of handling equipment, silo and conveyor, sorting and separating of seeds. At all moisture contents, rubber sheet showed the highest friction coefficient, follower! by plywood sheet, and galvanized sheet. The increase in friction coefficient with moisture content was the largest for Crimson sweet watermelon seed on galvanized surface, followed by Shimal FI and Galaxy on galvanized sheet and plywood surface, respectively. Crimson sweet variety had the highest friction on all frictional surfaces at all moisture levels.Minist Znanosti Obrazov, Sporta Republike Hrvatske, Same Deutz Fahr Zetelice, Poljonova, Gramip TPS, AGRIA, Agromehanika, INA, Agrogrom, SIP, Stepco, Agromarketin