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Title: Non-swirling steady and transient flow simulations in short-form spray dryers
Authors: Woo, M.W.
Daud, W.R.W.
Mujumdar, A.S. 
Wu, Z. 
Talib, M.Z.M.
Tasirin, S.M.
Keywords: aspect ratio
CFD simulation
confined jet
flow stability
spray dryer
Issue Date: 5-Jan-2009
Citation: Woo, M.W., Daud, W.R.W., Mujumdar, A.S., Wu, Z., Talib, M.Z.M., Tasirin, S.M. (2009-01-05). Non-swirling steady and transient flow simulations in short-form spray dryers. Chemical Product and Process Modeling 4 (1) : -. ScholarBank@NUS Repository.
Abstract: This paper numerically investigated the effect of chamber aspect ratio and operating conditions on flow stability within a short form spray dryer without the inclusion of droplet injection. Extensive analysis using different mesh configurations led to a new finding on the effect of expansion ratio on flow stability. A larger expansion ratio produces a more stable flow, which is due to the limitation of the jet fluctuation by the outlet geometry constriction. However, the flow might not be completely steady as fluctuations are magnified at higher inlet velocities, which can be explained by the confined jet feed-back mechanism. Fast Fourier Transform (FFT) analysis of the computed instantaneous velocity at selected spatial locations in the chamber revealed the effect of the chamber expansion ratio on periodicity of the flow structure. It is observed that changes in the expansion ratio primarily affect the amplitude of the 'noise' region in the frequency spectrum. Copyright © 2009 The Berkeley Electronic Press. All rights reserved.
Source Title: Chemical Product and Process Modeling
ISSN: 19342659
DOI: 10.2202/1934-2659.1351
Appears in Collections:Staff Publications

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