Book ChapterDOI
Flow properties of bulk solids -which properties for which application
J. Schwedes
- Vol. 10, pp 15-23
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TLDR
In this paper, a review of existing testers for measuring the flow properties of bulk solids is presented, and a comparison with regard to application is made with respect to application as tried.Abstract:
To design reliable devices for the handling of bulk solids and to characterize bulk solids, the flow properties of these bulk solids have to be known. For their measurement a great number of shear and other testers are available. The chapter gives a review of existing testers and demonstrates which tester should and can be used for which application. Many ideas, methods, and testers exist to measure the flowability of bulk solids. People running those tests seldom are interested in exclusively characterizing the flow properties of the bulk solid in question only. More often they want to use the measured data to design equipment, where bulk solids are stored, transported or otherwise handled, to decide which one out of a number of bulk solids has the best or the worst flowability, to fulfill the requirement of quality control, to model processes with the finite element method or to judge any other process in which the strength or flowability of bulk solids plays an important role. Many testers are available which measure some value of flowability, only some of these shall be mentioned here without claiming completeness. It is beyond the scope of this chapter to describe all testers in detail and to compare them one by one. Instead it tries first to define flow properties. Secondly applications are mentioned. Here the properties, which are needed for design, are described and the testers being able to measure these properties are mentioned. Finally a comparison with regard to application as tried.read more
Citations
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Journal ArticleDOI
Friction of wheat: Grain-on-grain and on corrugated steel
TL;DR: In this article, the authors used a modified direct shear apparatus to evaluate the coefficient of friction of wheat for grain-on-grain and on galvanized corrugated steel sheet.
Comparison Of Various Methods Used InThe Analysis Of Silos Without Wall Friction
TL;DR: The use of circular silos with independent hopper structure in the process of storing grain and other granular material has become very extensive nowadays as discussed by the authors, which requires sophisticated mathematical techniques for proper calculation.
Journal ArticleDOI
Flow Properties of Ficus Deltoidea Extract Powder and the Binders, Acdisol and Avicel
TL;DR: In this paper, a Jenike shear tester was used to measure the flow properties of the powder particle, such as the effective angle of internal friction, flow function and the angle of wall friction.
Proceedings ArticleDOI
Virtual Commissioning Approach based on the Discrete Element Method
Fabian Westbrink,Andreas Schwung +1 more
TL;DR: This work shows the complete framework to apply the Discrete Element Method as a hardware-in-the-loop system for virtual commissioning, which yields to an optimal throughput of a bulk good handling process by only using the simulated hardware representation.
References
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Journal ArticleDOI
Elasto-plastic stress-strain theory for cohesionless soil with curved yield surfaces
TL;DR: An elasto-plastic stress-strain theory for cohesionless soil with curved yield surfaces is developed on the basis of soil behavior observed in laboratory tests as discussed by the authors, which is applicable to general three-dimensional stress conditions, but the parameters required to characterize the soil behavior can be derived entirely from results of isotropic compression and conventional drained triaxial compression tests.
Journal ArticleDOI
An outline of hypoplasticity
TL;DR: The so-called hypoelastic constitutive equations, defined by the equationℸ=h(T, D), are limited by the requirement that h is linear in D.
Journal ArticleDOI
Measurement of flow properties of bulk solids
TL;DR: Flowability can best be described by using the flow function as being the relationship between the unconfined yield strength and the major principal stress at steady state flow as mentioned in this paper. But exact measurement of flow function is possible only with testers, and expensive regarding time and equipment.
Journal ArticleDOI
Numerical investigations on discharging silos
Ulrich Häussler,J. Eibl +1 more
TL;DR: In this paper, a numerical method to simulate discharging processes in mass flow silos is presented, which provides transient velocity and stress fields within the bulk material for a first period of discharging.