Long-range electrothermal fluid motion in microfluidic systems
| Autor: | Joseph C. Liao, Qinlong Ren, Siu Ling Leung, Vincent Gau, Yi Lu, Cho Lik Chan, Tingting Liu, Pak Kin Wong |
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| Rok vydání: | 2016 |
| Předmět: |
Fluid Flow and Transfer Processes
Engineering business.industry Mechanical Engineering 010401 analytical chemistry Mechanical engineering Nanotechnology 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Article 0104 chemical sciences Fluid motion 0210 nano-technology business |
| Zdroj: | International journal of heat and mass transfer. 98 |
| ISSN: | 0017-9310 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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