Abstract
AC electrothermal flow (ACEF) is the fluid motion created as a result of Joule heating induced temperature gradients. ACEF is capable of performing major microfluidic operations, such as pumping, mixing, concentration, separation and assay enhancement, and is effective in biological samples with a wide range of electrical conductivity. Here, we report long-range fluid motion induced by ACEF, which creates centimeter-scale vortices. The long-range fluid motion displays a strong voltage dependence and is suppressed in microchannels with a characteristic length below ∼300 μm. An extended computational model of ACEF, which considers the effects of the density gradient and temperature-dependent parameters, is developed and compared experimentally by particle image velocimetry. The model captures the essence of ACEF in a wide range of channel dimensions and operating conditions. The combined experimental and computational study reveals the essential roles of buoyancy, temperature rise, and associated changes in material properties in the formation of the long-range fluid motion. Our results provide critical information for the design and modeling of ACEF based microfluidic systems toward various bioanalytical applications.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 341-349 |
| Number of pages | 9 |
| Journal | International Journal of Heat and Mass Transfer |
| Volume | 98 |
| DOIs | |
| State | Published - Jul 1 2016 |
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All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanical Engineering
- Fluid Flow and Transfer Processes
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Long-range electrothermal fluid motion in microfluidic systems. / Lu, Yi; Ren, Qinlong; Liu, Tingting; Leung, Siu Ling; Gau, Vincent; Liao, Joseph C.; Chan, Cho Lik; Wong, Pak Kin.
In: International Journal of Heat and Mass Transfer, Vol. 98, 01.07.2016, p. 341-349.Research output: Contribution to journal › Article
TY - JOUR
T1 - Long-range electrothermal fluid motion in microfluidic systems
AU - Lu, Yi
AU - Ren, Qinlong
AU - Liu, Tingting
AU - Leung, Siu Ling
AU - Gau, Vincent
AU - Liao, Joseph C.
AU - Chan, Cho Lik
AU - Wong, Pak Kin
PY - 2016/7/1
Y1 - 2016/7/1
N2 - AC electrothermal flow (ACEF) is the fluid motion created as a result of Joule heating induced temperature gradients. ACEF is capable of performing major microfluidic operations, such as pumping, mixing, concentration, separation and assay enhancement, and is effective in biological samples with a wide range of electrical conductivity. Here, we report long-range fluid motion induced by ACEF, which creates centimeter-scale vortices. The long-range fluid motion displays a strong voltage dependence and is suppressed in microchannels with a characteristic length below ∼300 μm. An extended computational model of ACEF, which considers the effects of the density gradient and temperature-dependent parameters, is developed and compared experimentally by particle image velocimetry. The model captures the essence of ACEF in a wide range of channel dimensions and operating conditions. The combined experimental and computational study reveals the essential roles of buoyancy, temperature rise, and associated changes in material properties in the formation of the long-range fluid motion. Our results provide critical information for the design and modeling of ACEF based microfluidic systems toward various bioanalytical applications.
AB - AC electrothermal flow (ACEF) is the fluid motion created as a result of Joule heating induced temperature gradients. ACEF is capable of performing major microfluidic operations, such as pumping, mixing, concentration, separation and assay enhancement, and is effective in biological samples with a wide range of electrical conductivity. Here, we report long-range fluid motion induced by ACEF, which creates centimeter-scale vortices. The long-range fluid motion displays a strong voltage dependence and is suppressed in microchannels with a characteristic length below ∼300 μm. An extended computational model of ACEF, which considers the effects of the density gradient and temperature-dependent parameters, is developed and compared experimentally by particle image velocimetry. The model captures the essence of ACEF in a wide range of channel dimensions and operating conditions. The combined experimental and computational study reveals the essential roles of buoyancy, temperature rise, and associated changes in material properties in the formation of the long-range fluid motion. Our results provide critical information for the design and modeling of ACEF based microfluidic systems toward various bioanalytical applications.
UR - http://www.scopus.com/inward/record.url?scp=84977666886&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84977666886&partnerID=8YFLogxK
U2 - 10.1016/j.ijheatmasstransfer.2016.03.034
DO - 10.1016/j.ijheatmasstransfer.2016.03.034
M3 - Article
C2 - 27127306
AN - SCOPUS:84977666886
VL - 98
SP - 341
EP - 349
JO - International Journal of Heat and Mass Transfer
JF - International Journal of Heat and Mass Transfer
SN - 0017-9310
ER -