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Theoretical and Experimental Study of Microchannel Blockage Phenomena

[+] Author Affiliations
Eiichiro Yamaguchi, Ronald J. Adrian

University of Illinois at Urbana-Champaign, Urbana, IL

Paper No. ICMM2003-1113, pp. 851-857; 7 pages
doi:10.1115/ICMM2003-1113
From:
  • ASME 2003 1st International Conference on Microchannels and Minichannels
  • 1st International Conference on Microchannels and Minichannels
  • Rochester, New York, USA, April 24–25, 2003
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-3667-3
  • Copyright © 2003 by ASME

abstract

Microchannel blockage phenomena by hard, spherical particles have been investigated experimentally and theoretically. The study was performed over a range of particle-to-channel diameter ratios of 0.14 < R < 0.65. Two mechanisms have been investigated: orthokinetic flocculation and hydrokinetic arching. Arching appears to be the main mechanism for large, hard particles. In the absence of Brownian motion and inter-particle repulsive forces, other than simple Hertzian contact force, the blockage phenomenon is described by three non-dimensional parameters, N, R and β. The mean total number of particles in the channel having length L is N. Ratio of a diameter of particle (dp ) and a diameter of channel (D) is R. Blockage efficiency factor β is determined experimentally. The data shows that a critical value Nc exists as a function of R. N > Nc implies high likelihood of blockage; if N < Nc , blockages were never observed. The critical number decreases dramatically with increasing R. Blockages can occur at surprisingly low values of the volume concentration (φ). The experimental results matches well with the theory for the combinations of straight glass capillary, 76 < D < 156μm, 100mm-length, and spherical polymer particle, 22 < dp < 48μm.

Copyright © 2003 by ASME
Topics: Microchannels

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