Shear-induced arching of particle-laden flows in microtubes

Kendra V. Sharp, Ronald Adrian

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations

Abstract

Despite the growing interest in microfluidic systems, the study of two-phase flows in such systems thus far has been somewhat limited in scope. Examples of recent studies of two-phase flows in microchannels include flows containing liquid and gas (Tran, 1998; Stanley, 1997), the dispersion of laminar fluid streams (Galambos, 1998), and the flow of very dilute particle suspensions through micropumps (Jang et al., 1999). The present experiments identify 'shear-induced arching' as a new mechanism causing microtube blockage. This mechanism is most likely to occur when 0.33D < d p< 0.46D, where d p is the particle diameter and D is the microtube diameter, and was observed for flows of particle-laden fluids with concentration, φ, as low as 0.5%. Following a simple geometrical analysis, for 0.33D < d p< 0.46D, it can be shown that once the particles are in the arching configuration, lateral forces induced by the shear on the arch can hold the particles in place and stabilize the arch. Experiments were performed over a range of particle-to-tube diameter ratios. As predicted, if enough of the particles in any given experiment had a diameter of 0.33D-0.46D, blockages occurred in the microtube.

Original languageEnglish (US)
Title of host publicationASME International Mechanical Engineering Congress and Exposition, Proceedings
Pages3125-3129
Number of pages5
Volume2
StatePublished - 2001
Externally publishedYes
Event2001 ASME International Mechanical Engineering Congress and Exposition - New York, NY, United States
Duration: Nov 11 2001Nov 16 2001

Other

Other2001 ASME International Mechanical Engineering Congress and Exposition
CountryUnited States
CityNew York, NY
Period11/11/0111/16/01

Keywords

  • Microflows
  • Particle-laden
  • Shear-induced arching

ASJC Scopus subject areas

  • Engineering(all)

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