The stresses acting in a hopper are different from those in the vertical section. vertical stress after the discharge of some bulk solid vertical stress after filling the silo with a bulk solid c. pressure in a silo filled with a fluid (imaginary) b. This method is the basis for most present standards for the calculation of the load on silo walls for structural silo design. A method for the calculation of the stress course in the vertical section was derived by Janssen already in 1895. Due to the shear stresses, the silo walls carry a part of the weight of the bulk solid. The reason for this course are the shear stresses acting between the bulk solid and the silo walls even if the bulk solid is at rest. This means that the vertical stress will not increase further even if the filling height is much larger. If the height to diameter ratio of the silo is sufficiently large (usually: > 3), a constant vertical stress is attained. While the pressure (for fluids we will use the word „pressure') would increase linearly downwards if the silo would have been filled with a fluid (a), the course of the vertical stress (for bulk solids we will use the word 'stress') in a silo filled with a bulk solid is rather different (b,c): In the latter case in the vertical (cylindrical) section of the silo the vertical stress increases in a degressive way. The following essay considers the basic rules for the design of silos.įigure 1 shows silos and the pressures and stresses, respectively, acting in the silos. Problems with the storage of bulk solids in bins and silos can be avoided if they are designed with respect to the flow properties of the bulk solid which has to be stored. Storage of Powders and Bulk Solids in Silos WebVideosImagesNewsWikipediaTwitterWinToFlash Suggestor WinToFlash SuggestorDisable on this site About WinToFlash Suggestor

Win to flash suggestor