Characteristics of pellet flow in a Wurster coater draft tube utilizing piezoelectric probe
Luštrik, Matevž (Author), Šibanc, Rok (Author), Srčič, Stanko (Author), Perpar, Matjaž (Author), Žun, Iztok (Author), Dreu, Rok (Author)

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The main objective of this study was to develop a piezoelectric probe for measuring the impact rate of particles to enable characterization of the shape of particle number density profiles and characteristic particle impact frequencies inside the draft tube of a Wurster coating chamber. Pellets from 800microm to 900 m were subjected to fluidization in a conventional and swirl Wurster coating chambers. Fast Fourier Transform (FFT) analysis of the raw signal obtained at four heights and three different radial distances from the draft tube centerline was performed for experiments in a conventional and a swirl Wurster coating chamber at different process parameters. Power spectra revealed three characteristic frequency bands for both chambers: 1-5 Hz, 5-7 Hz, and 12-14 Hz. Particle number density profiles demonstrated an evident difference between both chambers. In the conventional Wurster coater, the location of the maximum number of particle impacts was close to the tube center, whereas in the swirl Wurster coater the particle impacts were distributed rather uniformly. The difference in particle number density profiles for both process chambers can help to understand the difference in performance of both Wurster coater designs.

Keywords:piezoelectric pressure transducer, particle number density profiles, circulating fluidized bed, particle impact frequencies, swirl-flow
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:FFA - Faculty of Pharmacy
Number of pages:str. 640-651
Numbering:Vol. 235, February
ISSN on article:0032-5910
DOI:10.1016/j.powtec.2012.11.034 Link is opened in a new window
COBISS.SI-ID:3357553 Link is opened in a new window
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Record is a part of a journal

Title:Powder technology
Shortened title:Powder technol.
Publisher:Elsevier Sequoia
COBISS.SI-ID:6576645 This link opens in a new window

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