Showing papers by "Sidney A. Thompson published in 1991"
TL;DR: In this article, a potential waste management system for the use of poultry litter was studied based upon the fractionation of litter, and it was determined that the compositions of the litter by particle size varied both with the number of flocks that had been raised on the litter and the type of house.
Abstract: A potential waste management system for the use of poultry litter was studied based upon the fractionation of litter. It was determined that the compositions of the litter by particle size varied both with the number of flocks that had been raised on the litter and the type of house. As the number of flocks raised on the litter increased from one to three flocks, the amount of fine material increased from 23 to 41%, while the concentration of the middle fraction decreased from 47 to 40%, and the coarse fraction decreased from 26 to 16%. The efficiency of retrieval of the fine fraction from the raw litter by either a vibrating screen separator or a rotary drum separator were found not to be significantly different. It was determined by chemical analysis that the P and K concentrations appeared to be distributed uniformly throughout the litter in each fraction while the N was non-uniformly distributed. The concentration of N was greatest in the fine fraction.
27 citations
TL;DR: In this paper, the authors used the differential form of Janssen's equation to predict the pressures and amount of material stored in a bin and showed that a change in grain height has a greater effect in increasing the amount of packing than does a change of bin diameter or moisture content of the stored material.
Abstract: The computer program WPACKING was validated using bin data for three different bin conditions: 1) a smooth-walled bin filled with wheat, 2) a corrugated-walled bin filled with wheat, and 3) a corrugated-walled bin filled with corn. WPACKING is a computer program which utilizes the differential form of Janssen’s equation to predict the pressures and amount of material stored in a bin. The differential form of Janssen’s equation allows the material properties in the equation to vary as a function of different properties. The material properties suggested for use in the WPACKING program were based upon previous experimental work by various researchers. From using the WPACKING program, it was apparent that a change in grain height has a greater effect in increasing the amount of packing than does a change in bin diameter or moisture content of the stored material.
12 citations
TL;DR: In this paper, the vertical loads imposed by wheat on five different temperature cables in a full-scale bin were measured, and experiments were conducted to determine the influence of radial positioning of the cable, grain discharge rate, starting H/D ratio, and detention time on vertical loads.
Abstract: The vertical loads imposed by wheat on five different temperature cables in a full-scale bin were measured. Tests were conducted to determine the influence of radial positioning of the cable, grain discharge rate, starting H/D ratio, and detention time on the vertical loads. Results illustrate where maximum vertical loads on temperature cables will occur under normal operating conditions.
6 citations
TL;DR: In this article, the authors measured the cable forces on temperature cables restrained from lateral movement, measured as a function of grain height, cable location and surface coating, and found that cable forces were one to nine times those previously measured for unrestrained cables.
Abstract: mperature cables restrained from lateral movement, were measured as a function of grain height, cable location and surface coating. For the restrained conditions, the cable forces were one to nine times those previously measured for unrestrained cables. The large load increase on the restrained cables is believed to be caused by the flow profile which existed at each of the three different cable locations. The flow profile at the center cable is predominantly vertical and the forces in the restrained condition resembled those in the unrestrained condition. For the two outer cable locations, both vertical and lateral force components exist because of the nature of the discharging grain at these two different locations. For the restrained condition, the largest forces occurred on the cable located at the middle position. For the unrestrained condition, the largest forces occurred on the cable located at the wall position. Surface coatings on the cable had an effect on the magnitude of the forces. Forces on vinyl coated cables were significantly larger than either the nylon or HDLE polyethylene coated cables in the restrained condition.
4 citations
TL;DR: In this paper, grain was discharged from storage conditions in which the initial grain depths and outlet locations were varied, and the type of flow was observed to vary with grain depth and outlet location.
Abstract: Flow patterns were observed as com and wheat were discharged from four clear plastic flat bottom model bins. Grain was discharged from storage conditions in which the initial grain depths and outlet locations were varied. The type of flow was observed to vary with grain depth and outlet location. For H/S (height to cross-section distance or diameter) ratios less than 1.25, wheat and com always discharged in funnel flow. Wheat discharged in intermediate flow for 1.25
3 citations