TY - GEN
T1 - Shear-induced arching of particle-laden flows in microtubes
AU - Sharp, Kendra V.
AU - Adrian, Ronald J.
N1 - Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2001
Y1 - 2001
N2 - 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 < dp< 0.46D, where dp 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.
AB - 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 < dp< 0.46D, where dp 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.
KW - Microflows
KW - Particle-laden
KW - Shear-induced arching
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M3 - Conference contribution
AN - SCOPUS:1542747796
SN - 0791835553
SN - 9780791835555
T3 - American Society of Mechanical Engineers, Micro-Electromechanical Systems Division Publication (MEMS)
SP - 553
EP - 557
BT - Micro-Electro-Mechanical Systems (MEMS) - 2001
PB - American Society of Mechanical Engineers
T2 - 2001 ASME International Mechanical Engineering Congress and Exposition
Y2 - 11 November 2001 through 16 November 2001
ER -