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Modeling of a novel vibrospring particle‐size distribution analyzer
Author(s) -
Mahgerefteh Haroun,
Shaeri Ali
Publication year - 2001
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690470306
Subject(s) - particle size distribution , particle size , materials science , vibration , spring (device) , particle (ecology) , range (aeronautics) , viscoelasticity , coil spring , spectrum analyzer , mechanics , sawdust , modulus , acoustics , composite material , optics , structural engineering , physics , engineering , geology , oceanography , pulp and paper industry , chemical engineering
The design and modeling of a novel technique for particle‐size distribution analysis are described. In its most basic form, the unit comprises a horizontally held closed‐coil helical spring that is partly filled with the test powder and sinusoidally vibrated in the transverse direction. Particle‐size distribution data are obtained by stretching the spring to known lengths and measuring the mass of the powder discharged from the spring resonant frequency. The spring's vibration characteristics, including the dynamic vibration profile as well as its first harmonic resonant frequency, are predicted using a viscoelastic model, which is in turn validated by comparison with experimental data. Particle‐size distribution data are reported in conjunction with a variety of powders including glass Ballotini, grit stone, sand, and sawdust in the size range 30–800 μm. A typical reproducibility is ±4%.