Simulation and Analysis of the Discharge Flow of Persian Lilac Fruit using Discrete Element Method

Document Type : Research Paper


1 M.Sc. Student, Department of Mechanics of Biosystem Engineering, Shahid Bahonar University of Kerman, Krerman, Iran

2 Professor, Department of Mechanics of Biosystem Engineering, Shahid Bahonar University of Kerman, Krerman, Iran


Discrete element method has been identified as a suitable method for studying the flow of granular materials. In this research, the motion of Persian lilac fruit was initially investigated experimentally in a slopped hopper and then it was simulated using discrete element method. The experiments were carried out on the basis of factorial design with two factors of height and discharge area, each at four levels. The ANOVA tests indicated that the height of the fruits in the hopper and the surface area of the discharge and their interaction had a significant effect on the outflow of the fruits. The developed regression equation between the mass flow rate and discharge area and the interaction of discharge area and height was linear (R2 = 0.99), however, height of the fruits in the hopper had a negative impact on the discharge rate. The simulation results indicated that and the outlet size, the discharge flow and the output velocity increase, but they did not exactly follow the fluid flow relationships. The effect of fruits friction showed that the discharge rate increased with decreasing internal friction. In general, comparing the simulation results with laboratory tests showed that the discrete element method was well able to simulate the flow of particles within and through the hopper.


Main Subjects

Abbaspour Fard, M., Emadi, H. & Khojasteh Pour, M. (2009). Investigation of the effect grain shape on substrate structure and flow characteristics of silos using numerical simulations by discrete element method (DEM). Journal of Agricultural Science and Natural Resources, 15(6), 233-242. (In Farsi).
Ai, J., Chen, J. F., Rotter, J.M. & Ooi, J. Y. (2011). Assessment of rolling resistance models in discrete element simulations. Journal of Powder Technology, 206(3), 269-282.
Balevicius, R., Kacianauskas, R., Mroz, Z. & Sielamowicz, I. (2010). Analysis and DEM simulation of granular material flow patterns in hopper models of different shapes. Advanced Power Technology, 22(2), 226-235.
Casandroiu, T. & Mieila, C. (2010). Theoretical development of a mathematical model to evaluate gravimetrical flow rate of seeds through orifices. University Politehnica of Bucharest (UPB) Scientific Bulletin: Series: D, Mechanical Engineering, 72(4), 269-280.
Chang, C. S. & Converse. H. H. (1988). Flow rates of wheat and sorghum through horizontal orifices. American society of Agricultural and Biological Engineers, 31(1), 300-304.
Crowford, N. C., Nagle, N., Sievers, D. A. & Stickel, J. J. (2016). The effects of physical and chemical preprocessing on the flo ability of corn stover. Biomass and Bioenergy, 85, 126-134.
Ghobadian, B. & Rahimi, H. (2004). Biofuels-past, present and future perspective. In International Iran and Russian Congress of Agricultural and Natural Science. Shahre-Kord University, Shahre Kord, Iran. (In Farsi)
Gonzales-Montellano, C., Ayuga, F. & Ooi, J. Y. (2011). Discrete element modelling of grain flow in a planar silo: influence of simulation parameters. Granular Matter, 13(2), 149-158.
Li, Y., Xu, Y. & Thornton, C. (2005). A comparison of discrete element simulations and experiments for sand piles composed of spherical particles. Powder Technology, 160(3), 219-228.
Mabrouk, R. Chaouki, J. & Guy, C. (2008). Wall surface effects on particle-wall friction factor in upward gas-solid flows. Powder Technology, 186(1), 80-88.
Mohammadi, A., Ghazanfari Moghaddam, A. & Noorbakhsh, Sh. (2016). Modeling the path of the flow of peeled and unpeeled bitter olives from a hopper. Journal of Agricultural Engineering, 16(1), 95-105. (In Farsi)
Nedderman, R. M. (1985). The flow of granular materials through orifices. Particle Technology, 91, 281-294.
Razavi, M. & Akbari, R. (2007). Biophysical properties of agricultural products and food stuffs. Ferdowsi University Press, Mashhad. (In Farsi).
Rong, G. Negi, S. C., & Jofriet, J. C. (1995). Simulation of the flow behavior of bulk solids in bins, Part 1: Model development and validation. Journal of Agricultural Engineering Research, 62(4), 247-256.
Sadeghi, M. & Salehpour Scoie, F. (2012). Development of numerical model of motion of spherical granular materials under vibration and investigation of the effect of vibration acceleration on particle flow based on discrete element method (DEM). In: 12th Iranian Manufacturing Engineering Conference, 6-8 Jan 2009. (In Farsi)
Tao, H., Zhong, W. & Jin, B. (2014). Flow behavior of non-spherical particle flowing in hopper. Journal of Frontiers in Energy, 8(3), 315-321.
Zarandi, M. & Ghazanfari, A. (2011). Chemical peeling of bitter olives using sodium hydroxide. In: 1st National Conference on Mechanization and Modern Technologies in Agriculture. 27-29th Feb., Ahvaz. (In Farsi)