The flow dynamic behaviors and characteristics of a two-stage viscous pump with two rotating cylinderes in microchannels were numerically studied by laminar model. At low Reynolds numbers, the dimensionless mass flow rate almost keeps constant for similar flow structure in the identical type of pump, and it also has little variation with different types of pump expect for the staggered pump with very small distance between different cylinders. As the Reynolds number increasing, the dimensionless mass flow rate drops because of the vortices evolution, and the distance between different cylinders significantly affects the flow dynamic process. For large distance, two steady vortices appear behind the cylinders, and the flow dynamics of aligned and staggered pump are very similar. For small distance, the flow rate of the staggered pump almost decreases with the distance rising, while the flow rate of the aligned pump has a maximum at a specific distance. Corresponding to the single-stage pump, the mass flow rate of two-stage pump is remarkably enhanced, and the enhanment ratio will increase as Reynolds number droping. Meanwhile, the driving power of two cylinders drops very slowly as the distance decreasing.
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ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels
June 23–25, 2008
Darmstadt, Germany
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-4834-5
PROCEEDINGS PAPER
Flow Dynamic Behaviors and Characteristics of Two-Stage Viscous Pump in Microchannels
Jianfeng Lu,
Jianfeng Lu
Sun Yat-Sen University, Guangzhou, China
Search for other works by this author on:
Jing Ding
Jing Ding
Sun Yat-sen University, Guangzhou, China
Search for other works by this author on:
Jianfeng Lu
Sun Yat-Sen University, Guangzhou, China
Jing Ding
Sun Yat-sen University, Guangzhou, China
Paper No:
ICNMM2008-62245, pp. 1213-1219; 7 pages
Published Online:
June 11, 2009
Citation
Lu, J, & Ding, J. "Flow Dynamic Behaviors and Characteristics of Two-Stage Viscous Pump in Microchannels." Proceedings of the ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. Darmstadt, Germany. June 23–25, 2008. pp. 1213-1219. ASME. https://doi.org/10.1115/ICNMM2008-62245
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