DETERMINATION OF DYNAMIC COEFFICIENT OF FRICTION FOR SOME MATERIALS FOR FEED PELLET UNDER DIFFERENT VALUES OF PRESSURE AND TEMPERATURE | ||
| Misr Journal of Agricultural Engineering | ||
| Article 69, Volume 25, Issue 4, October 2008, Pages 1389-1409 PDF (649.37 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/mjae.2008.190274 | ||
| Author | ||
| Mohamed M. Ibrahim | ||
| * Assist. Prof., Ag. Eng. Dept., Faculty of Agriculture, Cairo University, Egypt. | ||
| Abstract | ||
| Knowledge of frictional characteristics of materials is required for equipment design. The force of friction must be overcome before these materials flow. The objective of this study is to determine the dynamic coefficient of friction "μd" for yellow corn grits, wheat bran, soybean meal, cotton seed meal and mixtures of some of these materials used for manufacturing pellet for cattle animals, under different values of pressure and temperature. A device was developed for determining the dynamic coefficient of friction under pressure ranging from 9 kPaup to 109 kPa and temperature ranging from 30 to 150 oC. The value of "μd" was determined at ten levels of pressure "P": 9, 18, 27, 42, 53, 65, 75, 88, 97 and 109 kPa, and six levels of the temperature "T": 30, 50, 75, 100, 125 and 150 oC. The determined values of "μd" ranged from 0.113 to 0.397 for Yellow corn grits, from 0.122 to 0.505 for wheat bran, from 0.105 to 0.410 for cotton seed meal, from 0.105 to 0.347 for soybean meal and from 0.391 to 0.105 for mixtures of these materials. The empirical results obtained from the carried out experiments were used to introduce a group of contour charts, using "Excel program" to predict the value of "μd" for the different tested material as a function of both pressure and temperature. These empirical results were also used to derive six mathematical equations to predict the value of "μd" as a function of both pressure and temperature. Also, one general mathematical equation was derived to predict the value of "μd" as a function of raw material contents (protein, ash and moisture content), material pressure and temperature. | ||
| Keywords | ||
| Dynamic coefficient of friction; Pressure; Temperature; Yellow corn grits; Wheat bran; Soybean meal; Cotton seed meal | ||
| References | ||
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