Agglomeration and sizing of rolling particles in the sago sizing mechanism

Discrete particles with the moisture in a rotating system tend to form themselves as lumped mass granules of different sizes. This paper depicts the agglomeration of the particles using batch and continuous system through the mathematical modeling. The liquid bridge formation, coalescence and breakage are essential steps in the agglomeration process of continuous system. The combination of two effects, namely, binder viscosity and surface tension will govern the bridge formation. In case of batch system of granulation, a regime map of granulation behaviour has been developed for the particulate system of sago powder-water mixer, This regime map predicts the granule growth behaviour and it is possible to assist in designing and controlling the granulation systems. In these processes, mass of the granules varies continuously with respect to time. According to the conditions of coalescence and breakage behaviour, the agglomeration is maximum during three to six minutes of granulation due to the maximum percentage of granule breakage. After six minutes the granule breakage and growth is gradually reduced and after 10 min there is no granule growth due to minimuraor no breakage. The number of granule breakage increases with the Stokes deformation number. (C) 2017 Elsevier B.V. All rights reserved.