• 자원리싸이클링
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• 제22권3호
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• pp.65-72
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• 2013

수직컬럼형 풍력선별기의 선별능력을 향상시키기 위해 일시적인 중광(middling)의 흐름을 형성할 수 있는 측로(bypass)를 선별컬럼의 중앙에 설치하였다. 측로를 흐름을 조절하여 주선별컬럼에서 상부흐름의 속도는 가벼운 물질만이 상부로 회수하도록 설정하고 하부흐름의 속도는 무거운 물질만이 하부로 회수되도록 설정하였다. 측로로 이동하는 흐름은 사이클론을 통과시켜 중광이 피더로 회수되도록 하였다. 일반 수직컬럼형 풍력선별기와 개조된 선별기에서 유리와 지르코니아 비드(bead)의 혼합물을 사용하여 성능향상의 효과를 실험하였다.

• Journal of Biosystems Engineering
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• 제15권1호
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• pp.1-13
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• 1990

Aerodynamic property is the most important factor in designing the pneumatic separator and handling equipment for grains and seeds. Particularly the correct information about the terminal velocities of the corresponding grains and seeds is indispensible. However, a few studies with relation to the terminal velocities of grains and seeds were conducted in this country, even though the terminal velocities of the domestic grains and seeds are required to design those equiments which can be used for the domestic grains and seeds having specific aerodynamic properties. In this study, the terminal velocities for four varieties of varley and six varieties of paddy were investigated by means of two different methods, the suspension method and the drop method in an upward current of air. For measuring the terminal velocities, the vertical wind tunnel which had been examined about the uniform air flow in the previous study was used. In addition, the effect of the size of grains and the moisture content of grain kernel on the terminal velocity was examined. The following conclusions were derived from the study : 1. The different terminal velocities of grains are resulted from the different measuring methods. The terminal velocity measured by the drop method is smaller than that by the suspension method. It is considered that the difference in the terminal velocities is caused by the difference in the projection area of grain which is faced to the air stream. 2. The terminal velocity of grain increases as the size and the moisture content of the kernel increase. 3. The linear regression equations for the terminal velocities of grains were derived in terms of the moisture content of grains by the variety of grains and the measuring method. Also, the linear regression equations for the terminal velocity, based on the weighted size of grains, were derived in terms of the moisture contents of granis.