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Title: Highly swirling transient flows in spray dryers and consequent effect on modeling of particle deposition
Authors: Woo, M.W.
Che, L.M.
Daud, W.R.W.
Mujumdar, A.S. 
Chen, X.D.
Keywords: CFD
Particle deposition
Rotating disc
Spray dryer
Transient air flow
Issue Date: Mar-2012
Citation: Woo, M.W., Che, L.M., Daud, W.R.W., Mujumdar, A.S., Chen, X.D. (2012-03). Highly swirling transient flows in spray dryers and consequent effect on modeling of particle deposition. Chemical Engineering Research and Design 90 (3) : 336-345. ScholarBank@NUS Repository.
Abstract: Cotton turf and hotwire measurements were used to experimentally assess the highly swirling flow characteristics in a spray dryer fitted with a rotary disc atomizer. The numerical simulation captured key features of the flow field. Analysis revealed that rapid rotation of an atomizing disc tends to centrifugally split the central inlet jet. The flow field exhibited significant long time-scale transient behaviour. However, this centrifugally split jet resulted in a balanced upward recirculation region in the chamber as expected by the jet-feedback mechanism. Detailed analysis using a 'transient air-steady particle' approach revealed that this approach is applicable for such highly swirling transient flows as well. However, caution should be exercised when interpreting the deposition results, particularly in regions of low particle velocities. This is anticipated be an important consideration in future attempts to simulate the predominantly transient flows in spray dryers. © 2011 The Institution of Chemical Engineers.
Source Title: Chemical Engineering Research and Design
ISSN: 02638762
DOI: 10.1016/j.cherd.2011.06.019
Appears in Collections:Staff Publications

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