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Influence of flight shape on discharging profiles of granular material in rotary dryer

Ilham Benhsine 1, 2 Mustapha Hellou 1, 2 Franck Lominé 2, 1 Yves Roques 3
2 Geosax [LGCGM]
LGCGM - Laboratoire de Génie Civil et Génie Mécanique
Abstract : In this work, Discrete Element Method (DEM) is used in order to calculate the motion of granular material in rotating dryers. We are particularly interested in analysing the effect of flight shape on the behaviour of spherical particles in the cross section of the dryer. We will be using two segments flights and three different profiles : a straight flight (180° between both segments), an angled flight (with an angle of 120°) and a rightangled flight (90°). The results show that the profile of the flight affects significantly the motion of the particles in the cross section of the dryer. Changing the angle between the segment’s flight, changes the flight loading and thus the material hold-up which leads to different discharging profiles of the flight. For a right angled flight, the range of the discharge angle increases leading to a more uniformized cascade pattern in time and an enlarging of the area occupied by the curtains of particles. The specific durations (discharging time, falling time) are also determined and studied as a function of the flight shape.
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Ilham Benhsine, Mustapha Hellou, Franck Lominé, Yves Roques. Influence of flight shape on discharging profiles of granular material in rotary dryer. Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media, Jul 2017, Montpellier, France. pp.03023, ⟨10.1051/epjconf/201714003023⟩. ⟨hal-01551774⟩

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