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Keywords: granular media, discrete element method, friction, contact, heat transfer, conductance.

Summary

Heat transfer modelling for granular media is important for many industrial processes such as: powder metallurgy, chemical reactors (catalyst beds), food technology [1], thermal insulating [2] or simply the storing of particles in a silo after drying [3]. But, only few studies have developed an understanding of the heat transfer resulting from the friction effect in granular systems. However, these complex phenomena with multi-physics characteristics play an essential role in the world of industry and transport. For instance, significant friction (braking, jamming) would be responsible for half of the ignitions of explosive atmospheres but they are also the cause of fires in vehicles and accidents. One of the difficulties is to be able to predict the friction forces and the temperatures in the friction zone from the intrinsic properties of bodies in contact.

The first part of this work consists of using the discrete element method (DEM) for the contact detection, the determination of contact forces and kinematic parameters by using the MULTICOR computational software [4,5,6]. For a shearing plan at an imposed velocity, the MULTICOR prediction agrees with the result in literature [7].

For the second part, heat transfer by conductance [8] as well as heat flow generated by energy dissipation through friction between particles has been studied and implemented in MULTICOR. Finally, this paper gives some examples of how to underscore the phenomena of thermomechanical interaction. This is the first step in a study of the friction and wear by considering the existence of the third body flow for tribological contact.

References

1: O. Laguerre, S. Ben Amara, D. Flick, "Heat transfer between wall and packed bed crossed by low velocity airflow", Applied Thermal Engineering, 26, 1951-1960, 2006. doi:10.1016/j.applthermaleng.2006.01.011
2: S. Melka, J.J. Bézian, "L'isolation thermique par les matériaux granulaire", Revue Générale de Thermique, 36, 345-353, 1997. doi:10.1016/S0035-3159(97)81598-X
3: W.R. Ketterhagen, J.S. Curtis, C.R. Wassgren, A. Kong, P.J. Narayan, B.C. Hancock, "Granular segregation in discharging cylindrical hoppers: A discrete element and experimental study", Chemical Engineering Science, 2007. doi:10.1016/j.ces.2007.07.052
4: J. Fortin, O. Millet, G. de Saxcé, "Numerical simulation of granular materials by an improved discrete element method", Int. J. Numer. Meth. Engng, 62, 639- 663, 2005. doi:10.1002/nme.1209
5: J. Fortin, G. de Saxcé, "Modélisation numérique des milieux granulaires par l'approche du bi-potentiel", C. R. Acad. Sci., 327- série IIb, 721- 724, 1999.
6: J. Fortin, P. Coorevits, "Selecting contact particles in dynamics granular mechanics systems", Journal of Computational and Applied Mathematics, 168, 207- 213, 2004. doi:10.1016/j.cam.2003.05.025
7: Frédéric da Cruz, "Écoulement de grains secs: Frottement et blocage", École nationale des Ponts et Chaussées, 2004.
8: W.L. Vargas-Escobar, J.J. McCarthy, "Conductivity of granular media with stagnant intersitial fluids via thermal particle dynamics simulation", International Journal of Heat and Mass Transfer, 45, 4847- 4856, 2002. doi:10.1016/S0017-9310(02)00175-8

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 89 PROCEEDINGS OF THE SIXTH INTERNATIONAL CONFERENCE ON ENGINEERING COMPUTATIONAL TECHNOLOGY Edited by: M. Papadrakakis and B.H.V. Topping Paper 18 Modelling of the Energy Dissipation Generated by Friction in Granular Flow Using the Discrete Element Method V.D. Nguyen¹, J. Fortin², M. Guessasma¹, E. Bellenger¹ and P. Coorevits¹ ¹IUT de l'Aisne, Saint-Quentin, France ²INSSET, Saint-Quentin, France doi:10.4203/ccp.89.18 purchase the full-text of this paper Full Bibliographic Reference for this paper V.D. Nguyen, J. Fortin, M. Guessasma, E. Bellenger, P. Coorevits, "Modelling of the Energy Dissipation Generated by Friction in Granular Flow Using the Discrete Element Method", in M. Papadrakakis, B.H.V. Topping, (Editors), "Proceedings of the Sixth International Conference on Engineering Computational Technology", Civil-Comp Press, Stirlingshire, UK, Paper 18, 2008. doi:10.4203/ccp.89.18 Keywords: granular media, discrete element method, friction, contact, heat transfer, conductance. Summary Heat transfer modelling for granular media is important for many industrial processes such as: powder metallurgy, chemical reactors (catalyst beds), food technology [1], thermal insulating [2] or simply the storing of particles in a silo after drying [3]. But, only few studies have developed an understanding of the heat transfer resulting from the friction effect in granular systems. However, these complex phenomena with multi-physics characteristics play an essential role in the world of industry and transport. For instance, significant friction (braking, jamming) would be responsible for half of the ignitions of explosive atmospheres but they are also the cause of fires in vehicles and accidents. One of the difficulties is to be able to predict the friction forces and the temperatures in the friction zone from the intrinsic properties of bodies in contact. The first part of this work consists of using the discrete element method (DEM) for the contact detection, the determination of contact forces and kinematic parameters by using the MULTICOR computational software [4,5,6]. For a shearing plan at an imposed velocity, the MULTICOR prediction agrees with the result in literature [7]. For the second part, heat transfer by conductance [8] as well as heat flow generated by energy dissipation through friction between particles has been studied and implemented in MULTICOR. Finally, this paper gives some examples of how to underscore the phenomena of thermomechanical interaction. This is the first step in a study of the friction and wear by considering the existence of the third body flow for tribological contact. References 1 O. Laguerre, S. Ben Amara, D. Flick, "Heat transfer between wall and packed bed crossed by low velocity airflow", Applied Thermal Engineering, 26, 1951-1960, 2006. doi:10.1016/j.applthermaleng.2006.01.011 2 S. Melka, J.J. Bézian, "L'isolation thermique par les matériaux granulaire", Revue Générale de Thermique, 36, 345-353, 1997. doi:10.1016/S0035-3159(97)81598-X 3 W.R. Ketterhagen, J.S. Curtis, C.R. Wassgren, A. Kong, P.J. Narayan, B.C. Hancock, "Granular segregation in discharging cylindrical hoppers: A discrete element and experimental study", Chemical Engineering Science, 2007. doi:10.1016/j.ces.2007.07.052 4 J. Fortin, O. Millet, G. de Saxcé, "Numerical simulation of granular materials by an improved discrete element method", Int. J. Numer. Meth. Engng, 62, 639- 663, 2005. doi:10.1002/nme.1209 5 J. Fortin, G. de Saxcé, "Modélisation numérique des milieux granulaires par l'approche du bi-potentiel", C. R. Acad. Sci., 327- série IIb, 721- 724, 1999. 6 J. Fortin, P. Coorevits, "Selecting contact particles in dynamics granular mechanics systems", Journal of Computational and Applied Mathematics, 168, 207- 213, 2004. doi:10.1016/j.cam.2003.05.025 7 Frédéric da Cruz, "Écoulement de grains secs: Frottement et blocage", École nationale des Ponts et Chaussées, 2004. 8 W.L. Vargas-Escobar, J.J. McCarthy, "Conductivity of granular media with stagnant intersitial fluids via thermal particle dynamics simulation", International Journal of Heat and Mass Transfer, 45, 4847- 4856, 2002. doi:10.1016/S0017-9310(02)00175-8 purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £95 +P&P)
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