Effect of filling method on lateral pressure distributions in vertical wall of model grain silo
2000
Bintoro, N. (Tokyo Univ. of Agriculture (Japan)) | Sakaguchi, E. | Kawakami, S. | Ai, F.
Measurement of static and dynamic lateral pressures on the vertical wall of the silo was carried out using a square model silo. The effect of filling method and inside wall surface roughness on the lateral static and dynamic pressures were discussed. The measured pressures were then compared with the prediction values using some theoretical equations to assess the applicability of those equations. Japonica brown rice was used as the tested grain because the pressure behavior of this grain has never yet been reported. The results of this study can be summarized as follows. Sprinkle fill over the entire cross section of the silo (method C) produced about 10% and 8% larger in-bin bulk density than stream fill (method A) and sprinkle fill at the center region (method B), respectively. Filling method, which created larger value of the in-bin bulk density consistently produced larger values of lateral pressure, especially in the dynamic conditions, independent of wall surface roughness. Rough inside wall surface considerably reduced the magnitude of both static and dynamic lateral pressures. In the static condition, on average the pressures generated in rough-walled silo were 55%, 47% and 34% smaller than those in smooth-walled one for methods A, B and C, respectively, for the dynamic condition 43%, 43% and 60% for methods A, B and C, respectively. For the requirement of silo design, sprinkle fill over the entire cross section of the silo (method C) was recommended to achieve larger storage capacity. Large lateral pressures of this method could be reduced by applying rough surface material to the wall of the silo. Comparison between experimental results and prediction values revealed that filling method and surface roughness affected the accuracy of the prediction equations
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