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RISS 인기검색어
- 검색키워드
- 저자 : Ferenc Safranyik (검색결과 3 건)
- 무료
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Analytical approach of funnel flow discharge
Ferenc Safranyik,István Oldal 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.2
Design engineers often encounter problems because of the special mechanical behavior of granular materials. Such a typical problem is predicting discharge rate of silos and hoppers. This important design parameter must be known during the development of material transport devices attached to the container, but the calculation of this parameter may be challenging because well-known theories of hydrodynamics are not applicable. Several models are formed to evaluate discharge rate of silos, although most of them based on experimental observations are unable to explain physics of particle outflow. Oldal’s theory accounts for granular discharge of funnel flow, cylindrical silos with formation, and collapse of unstable arches above the orifice. It is applied to rectangular hoppers in this paper to generalize and prove this theory. An extended equation is derived by applying the original hypothesis that is validated using laboratory experiments and numerical simulations.
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Optimal oscillation parameters of vibrating screens
Ferenc Safranyik,Bela M. Csizmadia,Attila Hegedus,Istvan Keppler 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.5
Optimal oscillation parameters of vibrating screens are determined using analytical methods by investigating movement of a single spherical grain particle in the vibrating sieve’s non-inertial reference frame. Dimensionless parameters determining the efficiency of screening process are defined. Effect of interactions between multiple numbers of particles moving on the screen is analyzed using discrete element method. By comparing the analytical and numerical results, it can be seen, that the analytical evaluation of screening efficiency can be used until a given contaminant size unlimitedly in the examined range of screen angle. Additionally in case of this minimal contaminant size there is a maximal screening angle value. Above this angle it seems, that the use of our discrete element based evaluation of screening efficiency is unavoidable.
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Extension of silo discharge model based on discrete element method
István Oldal,Ferenc Safranyik 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.9
Silos are containers used by almost all fields of industry for storing granular materials and generally classified in two types: mass flowand funnel flow. One of the most important design parameter of these equipment is the discharge rate which depends on the flow mode. There are high numbers of analytical and empirical models used for determine this parameter, however none of them is suitable for bothflow modes; moreover the accuracy of mass flow models is not acceptable. Recently a few numerical discharge models are made forcertain geometries; but the applicability of these models in case of different flow modes was not examined. Aim of our work is the creationof an experimentally validated numerical discharge model based on others work and examination of this in term of different flowmodes. We prove that our modified model is suitable for determine silos discharge rate independently from flow mode.
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