Storage and Flow of Solids
01 Jan 1964-
About: The article was published on 1964-01-01 and is currently open access. It has received 585 citations till now. The article focuses on the topics: Flow (mathematics).
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01 Jan 2004
TL;DR: In this paper, the fundamentals of cohesive powder consolidation and flow behavior using a reasonable combination of particle and continuum mechanics are explained by means of the model "stiff particles with soft contacts".
Abstract: The fundamentals of cohesive powder consolidation and flow behav-iour using a reasonable combination of particle and continuum mechanics are ex-plained. By means of the model “stiff particles with soft contacts” the influence of elas-tic-plastic repulsion in particle contacts is demonstrated. With this as the physical basis, the stationary yield locus, instantaneous yield loci and consolidation loci, flow function, consolidation and compression functions by the flow properties of a very cohesive titania nanopowder (surface diameter d s = 200 nm) are presented. These models are used to evaluate shear cell test results as constitutive functions for computer aided de-sign of process apparatuses for reliable powder flow. Symbols a – separation, nm A – area, particle contact area, m² C H – Hamaker constant, J d – particle size, µm E – modulus of elasticity, kN/mm² F – force, N p – pressure, kPa p f – plastic yield strength of particle con-tact, MPa r – radius, nm e – porosity κ – elastic-plastic contact consolidation coefficient κ
TL;DR: The design parameters for conical hopper are presented, using MS Excel Add-in for hopper design, in the popular range of the wall friction angles for ten food powders in common use, and also correlates these parameters with the physical/flow properties of the powders.
Abstract: paper presents the design parameters for conical hopper, using MS Excel Add-in for hopper design, in the popular range of the wall friction angles for ten food powders in common use, and also correlates these parameters with the physical/flow properties of the powders. The design parameters are the opening diameter, critical applied stress, semi-included angle and the flow factor. The physical properties and direct shear test data of the ten food powders served as input parameters for computer based procedure developed for hopper design. The numerical results and correlations obtained are shown to be sufficiently accurate for engineering practice. They will enhance the efficient design of conical hoppers for these food powders.
01 Jan 2015
TL;DR: In this article, the authors give a brief ideology about designing of silos in batching system for glass manufacturing, four major constituents which are free flowing and granular are considered.
Abstract: This document gives a brief ideology about designing of silos in batching system for glass manufacturing. Four major constituents which are free flowing and granular are considered. Capacity of silo, batch size, numbers of batches are taken into account. Percentage wise weight of each component is calculated. Volumes of silos and hoppers are computed. Calculations of heights and diameters of each section of silo and collection hopper are involved. Working drawings of silo design are included.
01 Jan 2008
TL;DR: In this article, the flow profiles of silo that are more important for designing of silos of grain crop (cereals) used in various areas because of nutrient features was taken up.
Abstract: In this study , the flow profiles of silo that is more important for designing of silos of grain crop (cereals) used in various areas because of nutrient features was taken up. In the study scope, flow profiles for silos were introduced and some flow problems as factors influencing on the flowability of grainy products arching, ratholes (also called pipes) and segregation was explained in detail.
01 Jan 2009
TL;DR: In this paper, the discharge velocities at the annular gap of a vibrating hopper and at the outlet were calculated to predict necessary operating and idle periods (pulsed operation).
Abstract: The production of ultrafine powders requires reliable powder storage and handling equipment. The powder flow in a silo or bunker hopper - normally driven by the force of gravity - is frequently stopped by channelling or bridging. As a solution of this serious problem, the gravity flow can be promoted using an additional energy input by mechanical vibrations. The discharge rate can be controlled by pulsating operation of the vibrating hopper. It is possible to predict necessary operating and idle periods (pulsed operation) by calculation of the discharge velocities at the annular gap of a vibrating hopper and at the outlet. To prove these calculations, discharge experiments are carried out by full-scale silos of Coperion Waeschle and Zeppelin that were equipped by vibrating hoppers, i.e. WAM bin activator and Sch ffer vibrating spout. An ultrafine cohesive limestone powder (sh minerals) was selected to achieve - is this case desired - discharge problems like bridging and channelling in these silos. But the applied vibrations by pulsed operations enable the trouble-free powder discharge and flow.