Time scale analysis for fluidized bed melt granulation-II: Binder spreading rate |
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| Authors: | Kel W. Chua Yassir T. Makkawi Buddhi N. Hewakandamby Michael J. Hounslow |
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| Affiliation: | aParticle Products Group, Department of Chemical and Process Engineering, The University of Sheffield, Sheffield S1 3JD, UK;bChemical Engineering and Applied Chemistry, School of Engineering and Applied Science, Aston University, Birmingham B4 7ET, UK;cDepartment of Chemical and Environmental Engineering, Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK |
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| Abstract: | The spreading time of liquid binder droplet on the surface a primary particle is analyzed for Fluidized Bed Melt Granulation (FBMG). As discussed in the first paper of this series (Chua et al., in press) the droplet spreading rate has been identified as one of the important parameters affecting the probability of particles aggregation in FBMG. In this paper, the binder droplet spreading time has been estimated using Computational Fluid Dynamic modeling (CFD) based on Volume of Fluid approach (VOF). A simplified analytical solution has been developed and tested to explore its validity for predicting the spreading time. For the purpose of models validation, the droplet spreading evolution was recorded using a high speed video camera. Based on the validated model, a generalized correlative equation for binder spreading time is proposed. For the operating conditions considered here, the spreading time for Polyethylene Glycol (PEG1500) binder was found to fall within the range of 10−2 to 10−5 s. The study also included a number of other common binders used in FBMG. The results obtained here will be further used in paper III, where the binder solidification rate is discussed. |
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| Keywords: | Fluidization Granulation Binder spreading VOF modeling Particle processing Particle technology |
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