Abstract
Though the vertical pressure of the bulk materials filled in the cylindrical vessel with a flat bottom has been reported by many investigators, there has been few detailed report of the vertical pressure distribution.
In this paper, the size of cylindrical vessel, the filling method and the filling speed which affect the vertical pressure distribution are discussed.
As the result, the following conclusion is obtained:
1) In case of the peripheral feed, the curves of the vertical pressure distribution indicated by nondimension for each size of the vessel become roughly similarity, but that in case of the central feed becomes higher in the part closed to the wall than in the central part of a bed according to increase of the size of the vessel.
2) The values of the vertical pressure in the part with closed to the wall agree nearly, independently of the filling method of materials, with the results obtained by the peripheral feed and the central feed respectively.
3) The average pressure that obtained from the vertical pressure distribution measured differs greatly with the filling method of materials, in case of the peripheral feed with fine powder becomes higher pressure than that of the central feed, but granular materials becomes inversely.
4) Though the average pressure of the peripheral feed with fine powder agrees nearly with the values, calculated using Janssen's theory, granular materials become less than about half.
5) In case of the peripheral feed with fine powder, the vertical pressure in the central part of the vessel increases slightly according to increase of the filling speed, but that of granular materials is independently of the filling speed. In case of the central feed, the vertical pressure in the central part of the vessel filled increases slightly according to increase of the filling speed.
