Transverse motion of cohesive powders in flighted rotary kilns: experimental study of unloading at ambient and high temperatures

Prediction of conductive heating time scales of particles in a rotary drum

“…Other researchers have recently investigated the roles of flights and baffles in the material flow and/or heat transfer in rotary calciners, so the reader is referred to these studies if these complex geometries are of interest (Chaudhuri et al, 2010;Debacq et al, 2013;Njeng et al, 2015aNjeng et al, , 2015b. In the simulations, Fr was varied between 8.4 Â 10 À 5 and 3.0 Â 10 À 1 .…”

Transverse flow at the flight surface in flighted rotary drum

“…The main objective of this model is to determine the velocity profile along the surface layer of the flight over the flight discharge which can be used in Eq. (6). For this purpose, a mathematical model has been developed to study the transverse motion at the flight surface based on the earlier works of Mellmann et al [14] and Khakhar et al [26].…”

“…For each γ a local convergence for the layer thickness at flight tip (t E ) must be accomplished and then using this converged profiles for velocity a new γ can be obtained using Eq. (6). The motion profiles were calculated until a converged solution for both γ and t E was attained.…”

“…Numerous contributions have been made during the last few decades in the context of flight unloading studies by determining the quantity of material in the flight [1][2][3][4][5][6]. Various sets of equations were developed to determine the flight holdup for angular and extended circular flights [7].…”

Wall-to-solid heat transfer coefficient in flighted rotary kilns: Experimental determination and modeling

“…They are usually designed for applications needing tight control and clean heating of materials. Possible applications include [1]: calcination [2,3,4], reduction [5,6], controlled oxidation, carburization, solid-state reaction [7,8], drying [9,10] or waste disposal [11,12]. When operated at atmospheric pressure, these units consist of a cylindrical shell that can be slightly inclined, into which the solid burden is fed continuously at one end and discharged at the other.…”