2009
DOI: 10.1002/cjce.20159
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Identification of the state of a wet spouted bed through time‐frequency analysis of pressure fluctuation time series

Abstract: The feasibility of detecting instability in wet spouted beds via pressure fluctuation (PF) time-series analyses was investigated. Experiments were carried out in a cylindrical Plexiglas column of diameter 150 mm with a conical base of internal angle 60 • , an inlet orifice diameter of 25 mm and glass beads of diameter 2.4 mm. Transducers at several axial positions measured PF time series with incremental addition of aqueous sucrose solutions of different concentrations. Liquid addition affected the spouted bed… Show more

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Cited by 12 publications
(5 citation statements)
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References 26 publications
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“…From then on, the pressure signal became more stable with reduced fluctuations. Similar trends were observed by Xu et al and Oliveira et al This is because the bed gets saturated with liquid leading to agglomerates or lumps. This limits uniform distribution of the incoming gas and encourages channeling and thus affects the pressure fluctuation signals in the bed.…”
Section: Resultssupporting
confidence: 86%
“…From then on, the pressure signal became more stable with reduced fluctuations. Similar trends were observed by Xu et al and Oliveira et al This is because the bed gets saturated with liquid leading to agglomerates or lumps. This limits uniform distribution of the incoming gas and encourages channeling and thus affects the pressure fluctuation signals in the bed.…”
Section: Resultssupporting
confidence: 86%
“…Processing instabilities such as product accumulation, agglomeration of inert bodies, system defluidisation and bed blockage, associated with losses of bioactive compounds caused by product degradation or volatiles losses have been reported as major problems observed on the drying of herbal extracts on the surface of inert bodies. In general, these problems are related to the physicochemical properties of the feed composition and the dryer operating conditions . The use of modified configurations, such as vibrated or pulsed systems, systems equipped with conventional or modified draft tubes, or even changes in chamber geometry can contribute to the improvement of the system performance, even when processing highly sticky materials .…”
Section: Introductionmentioning
confidence: 99%
“…This phenomenon has been observed not only in our experiment but also in Oliveira's experiment. 11 It may be caused by the unequal liquid content distribution. 21,22 To get a stable spouting process, it looks like that the spouted bed with a draft tunnel will be more suitable for the wet spouting process than the conventional spouted bed without a draft tunnel.…”
Section: Resultsmentioning
confidence: 99%
“…Nagahashi et al claimed that introducing a little liquid into a spouted bed can enhance the spouting process. Oliveira et al researched the instability of wet spouted bed and investigated the feasibility of detecting instability via pressure fluctuation time-series analyses. Passos et al analyzed the effect of capillary force on the agglomeration in wet spouted bed and fluidized bed.…”
Section: Introductionmentioning
confidence: 99%