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ARPN Journal of Science and Technology >> Volume 7, Issue 2, November 2017

ARPN Journal of Science and Technology


A Comparative Study of Some Physical Properties of Large and Medium Size Cocoa Beans from Ghana

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Author Bart-Plange A., Dzisi A. K., Addo, A., Teye, E. , Kumi, F
ISSN 2225-7217
On Pages 135-141
Volume No. 2
Issue No. 3
Issue Date May 01, 2012
Publishing Date May 01, 2012
Keywords Cocoa, physical properties, 1000-bean mass, bulk density, angle of repose, co-efficient of static friction.



Abstract

The physical properties of Cocoa are necessary for the design of equipment to handle, transport, process and store the commodity. Cocoa beans can be categorised into several groups based on their sizes. A comparative study of the physical properties of the large group (category B) and the medium group (category D) Cocoa beans were evaluated as a function of bean moisture content within the range of 5.67 - 25.04% wet basis. The 1000-bean mass increased linearly from 1125 1300 g and 948.75 1112 g as moisture content increased from 8.6 - 23.08% and 9.19 - 25.04% for categories B and D respectively. The bulk density decreased linearly from 559.60 - 505.05 kg/m3 and from 699.9 - 630.18 kg/m3 for categories B and D respectively. The emptying angle of repose for category B increased linearly from 27.26 37.470 in the moisture content range of 7.56 18.8% while that of category D also increased from 27.98 46.520 within the moisture content range of 9.19 - 25.04%. The filling angle of repose for category B in the moisture content range of 5.67- 22.0% increased linearly from 23.74 33.810 and that of category D increased linearly from 30.33 - 42.980 between moisture content range of 9.19 - 25.04%. The static coefficient of friction increased linearly from 0.48 - 0.60, 0.56 - 0.69, and 0.21 - 0.28 for mild steel, plywood, and rubber respectively for category B. For category D, a linear increment in static co-efficient of friction from 0.53 - 0.62 and 0.56 - 0.63 was observed for mild steel and plywood while that for rubber increased non-linearly from 0.12 - 0.32.


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