Spectral analysis of force fluctuations during probe penetration into cohesive powders Academic Article

abstract

• We investigate force fluctuations during probe penetration into cohesive powders consisting of 5m lactose particles with varying surface properties prepared by spray drying. The results obtained for the more cohesive powders were remarkably similar to those previously reported for orders of magnitude larger noncohesive particles. For the less cohesive powders, the spectral densities were instead found to exhibit two distinct power-law regions. Furthermore, the spectra were found to be independent of the geometry of the penetrating probe and dimensions of the die cavity. These findings suggest that the response is dominated by particle aggregate or agglomerate movement for the more cohesive powders, whereas the behaviour of the less cohesive ones is consistent with a response dominated by relatively weak force chains, with the fluctuations resulting from the recurring creation and collapse of jammed states being damped for length scales > 0.1mm. 2008 Elsevier B.V. All rights reserved.

authors

• Kish, Laszlo

published proceedings

• POWDER TECHNOLOGY

author list (cited authors)

• Frenning, G., Alderborn, G., Kish, L. B., & Mahlin, D.

citation count

• 4

complete list of authors

• Frenning, Goran||Alderborn, Goran||Kish, Laszlo B||Mahlin, Denny

publication date

• January 2008

publisher

• Elsevier  Publisher

published in

• Powder Technology  Journal

keywords

• Cohesion
• Fluctuations
• Granular Materials
• Percolation
• Powders
• Probe Penetration

Digital Object Identifier (DOI)

• 10.1016/j.powtec.2008.01.011

start page

• 62

end page

• 67

volume

• 187

issue

• 1

URL

• http%3A%2F%2Fdx.doi.org%2F10.1016%2Fj.powtec.2008.01.011