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Metoda elementow dyskretnych [DEM] narzedziem badania wlasciwosci materialow sypkich
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Abstrakty
With an increase in the scale of industrial operations the necessity of understanding the behaviour of granular materials and examining their properties becomes increasingly important. It is associated with rapid development of industries such as: food, chemical, pharmaceutical, cosmetic etc., in which materials in granular form are processed. One way of description of macroscopic behaviour of granular systems is a model including interactions between individual particles and between particle and elements of construction. Current needs of both technology and science call for the new research methods that provide more accurate results and enable closer examination of processes. Development of computational techniques resulted in the elaboration of Discrete Element Method (DEM). This article is focused on DEM as proposed by Cundall & Strack [1979] which enables interpretation of processes occurring in granular bedding considering phenomena on interparticle scale. The limitations and capabilities of DEM as well as results of modelling experimental investigations are addressed.
Wzrost skali operacji przemysłowych wykonywanych na materiałach ziarnistych w wielu gałęziach przemysłu (spożywczego, chemicznego, farmaceutycznego, kosmetycznego i in.), niosie konieczność zrozumienia ich zachowania oraz badania ich właściwości mechanicznych. Jednym ze sposobów interpretacji efektów obserwowanych w ośrodkach granularnych jest stosowanie technik numerycznych do ich modelowania. Szerokie stosowanie materiałów w formie ziarnistej niesie potrzebę poszukiwania lepszych metod badawczych, których wykorzystanie zapewniałoby dokładność wyników oraz umożliwiało precyzyjną interpretację procesów zachodzących w złożu. Rozwój technik komputerowych w drugiej połowie XX wieku zaowocował powstaniem Metody Elementów Dyskretnych (DEM). Celem artykułu jest prezentacja, zaproponowanej przez Cundalla & Stracka [1979] metody numerycznej DEM, umożliwiającej analizę efektów obserwowanych w ośrodku sypkim poprzez uwzględnienie procesów zachodzących na poziomie mikrostrukturalnym. Zaprezentowano ograniczenia i możliwości metody oraz wyniki modelowania wybranych testów eksperymentalnych.
Wydawca
Rocznik
Tom
Numer
Strony
169-173
Opis fizyczny
p.169-173,fig.,ref.
Twórcy
autor
- Polish Academy of Sciences, Doswiadczalna 4, 20-290 Lublin, Poland
autor
autor
Bibliografia
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- 13. Langston P.A., Al-Awamleh M.A., Fraige F.Z., Asmar B.N., Distinct element modelling of non-spherical frictionless particle flow. Chem. Engin. Sci., 2004, 59, 425-435.
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- 17. O’Sullivan C., Bray J.D., Selecting a suitable time step for discrete simulations that use the central difference time integration scheme. Engin. Comput., 2004, 21, 278-303.
- 18. Raji A.O., Favier J.F., Model for the deformation in agricultural and food particulate materials under bulk compressive loading using discrete element method. I: Theory, model development and validation. J. Food Engin., 2004, 64, 359-371.
- 19. Sakaguchi E., Favier J.F., Analysis of the behaviour of a grain assembly using DEM simulation. International Agrophysics, 2000, 14, 241-248.
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- 21. Sakaguchi E., Kawasaki S., Suyuki M., Urakawa T., Favier J.F., Effective Use of DEM Simulation for Development of Grain Processing Technology. Report No. 98-F-021. AgEng ‘98 Conference on Agricultural Engineering, Oslo, Norway, 1998.
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Bibliografia
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