In this study, we develop a micro-schlieren analysis methodology to facilitate measurement of inhomogeneities in a micromixer. As a first step, calibration procedures are performed by mixing dilute aqueous methanol and water in a T-microchannel in order to obtain the relation between the refractive index gradients and pixel grayscale values. Knowing the influences of concentration in the refractive index of aqueous methanol solution, we are able to associate pixel grayscale values with the concentration gradient along the cross-stream axis. For refractive index gradient larger than 130 m−1, the calibration curve shows great linearity, setting the sensitivity limit of our quantitative micro-schlieren system to 2 × 104 m−1 for concentration gradient. We then implement this methodology to examine the mixing behavior in a microfluidic oscillator. The results prove that the micro-schlieren technique is able to provide spatially-resolved, noninvasive, full-field transient measurements and offer a valuable insight into the microscale mass transport phenomena that other methods fail to deliver. While the micro-schlieren technique is directly linked to the measurement of refractive index gradient, the present methodology can be extended to other scalar quantitations that are related to the variation of refractive index in the future.
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ASME-JSME-KSME 2011 Joint Fluids Engineering Conference
July 24–29, 2011
Hamamatsu, Japan
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-4441-0
PROCEEDINGS PAPER
Application of Micro-Schlieren Technique to Quantitative Analysis of Mass Transport in a Micromixer
Tzu-hsun Hsiao,
Tzu-hsun Hsiao
National Taiwan University of Science and Technology, Taipei City, Taiwan
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Chen-li Sun
Chen-li Sun
National Taiwan University of Science and Technology, Taipei City, Taiwan
Search for other works by this author on:
Tzu-hsun Hsiao
National Taiwan University of Science and Technology, Taipei City, Taiwan
Chen-li Sun
National Taiwan University of Science and Technology, Taipei City, Taiwan
Paper No:
AJK2011-36022, pp. 359-364; 6 pages
Published Online:
May 25, 2012
Citation
Hsiao, T, & Sun, C. "Application of Micro-Schlieren Technique to Quantitative Analysis of Mass Transport in a Micromixer." Proceedings of the ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 2, Fora. Hamamatsu, Japan. July 24–29, 2011. pp. 359-364. ASME. https://doi.org/10.1115/AJK2011-36022
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