Abstract
Study of particle migration is important to enhance and increase the efficiency of the positioning and sorting process in order to produce the high yield of desired product especially in microfluidic applications. In this study, in order to study particle migration, normalized particle concentration in a micro-channel has been calculated for high initial particle concentrations (ξ=3.0, 5.0 and 10.0%) and the small particle diameters (d<inf>p</inf>=1.3, 1.5 and 2.1μm) by using capacitance data measured by a multi-capacitance sensing method. From the calculations, it has been observed that the particle concentration at the wall vicinity area is increased as ξ and d<inf>p</inf> are increased while the particle concentration at the center area is decreased. To analyze the tendency of the particle migration, two quantitative indicators are introduced, viz., streamwise migration ratio (Ψ) which is the ratio of particle concentration at the downstream to the upstream cross-section position, and the cross-sectional migration ratio (Φ) which is the ratio of the particle concentration at the wall to the center area at the same cross-sectional position. The result shows that the Ψ at the center area is decreased as the particles move along the channel irrespective of ξ and d<inf>p</inf> while the Ψ at the wall vicinity area is increased. Based on Ψ and Φ, it has been observed that the particle migrate from the center area towards the wall vicinity area in the case of low ξ and small d<inf>p</inf> while the particles tend to concentrate on the center area in the case of high ξ and the large d<inf>p</inf>. As a result, the particle concentration at center is higher in the case of the lower ξ and the smaller d<inf>p</inf> than that in the case of higher ξ and the larger d<inf>p</inf>.
| Original language | English |
|---|---|
| Pages (from-to) | 162-169 |
| Number of pages | 8 |
| Journal | Flow Measurement and Instrumentation |
| Volume | 45 |
| DOIs | |
| Publication status | Published - 1 Oct 2015 |
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Keywords
- Cross-sectional migration ratio
- Micro-channel
- Multi-capacitance sensing
- Multi-layered sensor electrodes
- Particle concentration
- Particle migration
- Streamwise migration ratio
ASJC Scopus subject areas
- Instrumentation
- Modelling and Simulation
- Computer Science Applications
- Electrical and Electronic Engineering
Cite this
Measurement of particle migration in micro-channel by multi-capacitance sensing method. / Ali Othman, Nur Tantiyani; Obara, Hiromichi; Sapkota, Achyut; Takei, Masahiro.
In: Flow Measurement and Instrumentation, Vol. 45, 01.10.2015, p. 162-169.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Measurement of particle migration in micro-channel by multi-capacitance sensing method
AU - Ali Othman, Nur Tantiyani
AU - Obara, Hiromichi
AU - Sapkota, Achyut
AU - Takei, Masahiro
PY - 2015/10/1
Y1 - 2015/10/1
N2 - Study of particle migration is important to enhance and increase the efficiency of the positioning and sorting process in order to produce the high yield of desired product especially in microfluidic applications. In this study, in order to study particle migration, normalized particle concentration in a micro-channel has been calculated for high initial particle concentrations (ξ=3.0, 5.0 and 10.0%) and the small particle diameters (dp=1.3, 1.5 and 2.1μm) by using capacitance data measured by a multi-capacitance sensing method. From the calculations, it has been observed that the particle concentration at the wall vicinity area is increased as ξ and dp are increased while the particle concentration at the center area is decreased. To analyze the tendency of the particle migration, two quantitative indicators are introduced, viz., streamwise migration ratio (Ψ) which is the ratio of particle concentration at the downstream to the upstream cross-section position, and the cross-sectional migration ratio (Φ) which is the ratio of the particle concentration at the wall to the center area at the same cross-sectional position. The result shows that the Ψ at the center area is decreased as the particles move along the channel irrespective of ξ and dp while the Ψ at the wall vicinity area is increased. Based on Ψ and Φ, it has been observed that the particle migrate from the center area towards the wall vicinity area in the case of low ξ and small dp while the particles tend to concentrate on the center area in the case of high ξ and the large dp. As a result, the particle concentration at center is higher in the case of the lower ξ and the smaller dp than that in the case of higher ξ and the larger dp.
AB - Study of particle migration is important to enhance and increase the efficiency of the positioning and sorting process in order to produce the high yield of desired product especially in microfluidic applications. In this study, in order to study particle migration, normalized particle concentration in a micro-channel has been calculated for high initial particle concentrations (ξ=3.0, 5.0 and 10.0%) and the small particle diameters (dp=1.3, 1.5 and 2.1μm) by using capacitance data measured by a multi-capacitance sensing method. From the calculations, it has been observed that the particle concentration at the wall vicinity area is increased as ξ and dp are increased while the particle concentration at the center area is decreased. To analyze the tendency of the particle migration, two quantitative indicators are introduced, viz., streamwise migration ratio (Ψ) which is the ratio of particle concentration at the downstream to the upstream cross-section position, and the cross-sectional migration ratio (Φ) which is the ratio of the particle concentration at the wall to the center area at the same cross-sectional position. The result shows that the Ψ at the center area is decreased as the particles move along the channel irrespective of ξ and dp while the Ψ at the wall vicinity area is increased. Based on Ψ and Φ, it has been observed that the particle migrate from the center area towards the wall vicinity area in the case of low ξ and small dp while the particles tend to concentrate on the center area in the case of high ξ and the large dp. As a result, the particle concentration at center is higher in the case of the lower ξ and the smaller dp than that in the case of higher ξ and the larger dp.
KW - Cross-sectional migration ratio
KW - Micro-channel
KW - Multi-capacitance sensing
KW - Multi-layered sensor electrodes
KW - Particle concentration
KW - Particle migration
KW - Streamwise migration ratio
UR - http://www.scopus.com/inward/record.url?scp=84931264746&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84931264746&partnerID=8YFLogxK
U2 - 10.1016/j.flowmeasinst.2015.06.015
DO - 10.1016/j.flowmeasinst.2015.06.015
M3 - Article
AN - SCOPUS:84931264746
VL - 45
SP - 162
EP - 169
JO - Flow Measurement and Instrumentation
JF - Flow Measurement and Instrumentation
SN - 0955-5986
ER -