Effect of density homogeneity on the dynamic response of powder beds

T. Yanagida, A. J. Matchett, J. M. Coulthard, B. N. Asmar, P. A. Langston, J. K. Walters

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Homogeneous and inhomogeneous powder beds subjected to low-magnitude vibration are compared in terms of the dynamic response. The inhomogeneous samples were segregated into two phases: loose and dense phases, layering the two phases horizontally or vertically. An apparent mass, defined as a ratio of the base force to base acceleration, was measured. Comparison of homogeneous and segregated data demonstrated a significant density gradient dependence on the apparent mass data. First, homogeneous systems showed a resonant peak, which gave the longitudinal elastic modulus of the bed via the velocity of longitudinal stress wave propagation. Second, vertically segregated systems exhibited two significant peaks at low frequencies, corresponding to the resonance of each phase. In addition, the apparent mass values at the two peaks were related to the quantity of each phase. Third, horizontally segregated systems exhibited a resonant peak, whose frequency was approximately equal to homogeneous data, but the apparent mass value at the peak differed from homogeneous data. A model based on the fourth-power scaling law, two-phase theory and Rayleigh's energy method gave an interpretation for the insensitivity of the peak frequency to the density gradient in the vertical direction.

Original languageEnglish
Pages (from-to)2009-2021
Number of pages13
JournalAIChE Journal
Volume49
Issue number8
DOIs
Publication statusPublished - Aug 1 2003
Externally publishedYes

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Elastic Modulus
Scaling laws
Base Composition
Vibration
Powders
Wave propagation
Dynamic response
Elastic moduli
Direction compound

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Environmental Engineering
  • Chemical Engineering(all)

Cite this

Yanagida, T., Matchett, A. J., Coulthard, J. M., Asmar, B. N., Langston, P. A., & Walters, J. K. (2003). Effect of density homogeneity on the dynamic response of powder beds. AIChE Journal, 49(8), 2009-2021. https://doi.org/10.1002/aic.690490811

Effect of density homogeneity on the dynamic response of powder beds. / Yanagida, T.; Matchett, A. J.; Coulthard, J. M.; Asmar, B. N.; Langston, P. A.; Walters, J. K.

In: AIChE Journal, Vol. 49, No. 8, 01.08.2003, p. 2009-2021.

Research output: Contribution to journalArticle

Yanagida, T, Matchett, AJ, Coulthard, JM, Asmar, BN, Langston, PA & Walters, JK 2003, 'Effect of density homogeneity on the dynamic response of powder beds', AIChE Journal, vol. 49, no. 8, pp. 2009-2021. https://doi.org/10.1002/aic.690490811
Yanagida T, Matchett AJ, Coulthard JM, Asmar BN, Langston PA, Walters JK. Effect of density homogeneity on the dynamic response of powder beds. AIChE Journal. 2003 Aug 1;49(8):2009-2021. https://doi.org/10.1002/aic.690490811
Yanagida, T. ; Matchett, A. J. ; Coulthard, J. M. ; Asmar, B. N. ; Langston, P. A. ; Walters, J. K. / Effect of density homogeneity on the dynamic response of powder beds. In: AIChE Journal. 2003 ; Vol. 49, No. 8. pp. 2009-2021.
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