Characteristic attributes of the peanut (Arachis hypogaea L.) for its separation
A.S. El-Sayed 1
,  
R. Yahaya 2
,  
P. Wacker 2
,  
 
 
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1
Soil and Water Department, Faculty of Agriculture, Suez Canal University, Ismailia, Egypt
2
Institute for Agricultural Engineering, University of Hohenheim, Garbenstrasse 9, 70599 Stuttgart, Germany
Acceptance date: 2001-08-16
 
Int. Agrophys. 2001, 15(4): 225–230
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ABSTRACT
Physical and aerodynamic peanut (Arachis hypogaea L.) properties have been investigated and defined. The geometric diameter, mass, and standard deviation values of three peanut varieties (American, Chinese, and Egyptian) had no significant differences. The terminal velocity for different varieties of pods ranged between 7.7 to 12.9 m s-1. Experimental measurements of shelled components of the Egyptian variety (Gisa-5) indicated that the terminal velocity value of 7.4 m s-1 was optimal for airflow velocity to separate shelled peanut components from the shells with only 1.8% loss of intactness and split seeds on a sieved surface of 6.3 and 8.0 mm. Also importantly, air velocity values of 10.2 and 9.8 m s-1 were found adequate to separate the intact seeds from the split seeds when they are sieved on surfaces with meshes of 8.0 and 6.3 mm, respectively.
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