In this paper, global pressure drop and velocity field were experimentally investigated for water flow in trapezoid 30mm long microchannels with a hydraulic diameter of 238μm. A micro-PIV system was used to obtain the velocity profiles at different locations of the microchannel. For Re > 500, Δp/L-Re relationship deviates from the linear relationship and the deviation depends on the Re. The experimental results of the velocity field show that the deviation is due to the entrance effect in microchannel, and the entrance length in our experiments can be predicted by Le/Dh = (0.07 ∼ 0.09)Re. Velocity profiles and root mean square values of the fluctuating centerline velocity obtained by micro-PIV indicate that the transition from laminar flow to turbulent flow has occurred between 1500 and 1800. This result is consistent with the global measurements of pressure drop.
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ASME 3rd International Conference on Microchannels and Minichannels
June 13–15, 2005
Toronto, Ontario, Canada
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-4185-5
PROCEEDINGS PAPER
Flow Characteristics in a Trapezoidal Silicon Microchannel Available to Purchase
Peng-Fei Hao,
Peng-Fei Hao
Tsinghua University, Beijing, China
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Zhao-Hui Yao
Zhao-Hui Yao
Tsinghua University, Beijing, China
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Peng-Fei Hao
Tsinghua University, Beijing, China
Feng He
Tsinghua University, Beijing, China
Zhao-Hui Yao
Tsinghua University, Beijing, China
Paper No:
ICMM2005-75129, pp. 313-318; 6 pages
Published Online:
November 11, 2008
Citation
Hao, P, He, F, & Yao, Z. "Flow Characteristics in a Trapezoidal Silicon Microchannel." Proceedings of the ASME 3rd International Conference on Microchannels and Minichannels. ASME 3rd International Conference on Microchannels and Minichannels, Parts A and B. Toronto, Ontario, Canada. June 13–15, 2005. pp. 313-318. ASME. https://doi.org/10.1115/ICMM2005-75129
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