Measurements of flow-induced birefringence in microfluidics
Chen-li Sun,Hung-Yen Huang +1 more
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TLDR
The outcome of this study proves that the approach provides a non-invasive method that enables an intuitive full-field representation of stress in the instantaneous flow field in a microfluidic device.Abstract:
In this study, we demonstrate the use of a microscopic circular polariscope to measure the flow-induced birefringence in a microfluidic device that represents the kinematics of fluid motion optically. Unlike the commercial birefringence microscope employed in the previous studies, our approach is able to provide direct measurement of retardance, which quantifies the difference in refractive index of the fluid experienced by the ordinary and extraordinary rays, from one single image frame. This capability facilitates unsteady full-field quantitation of flow-induced birefringence in microfluidics that has never been achieved before. At low flow rates, we find that the value of the retardance is independent of the microfluidic design and proportional to the nominal strain rates. This linearity bridges the measurement of birefringence and the deformation rate in the microflow environment, which yields the stress information of the fluid flow. In addition, the μPIV results confirm that both extensional and shear strain rates contribute to the flow-induced birefringence so that the retardance distribution can be used to represent the field of the principal strain rate in a microfluidic device. The outcome of this study proves that our approach provides a non-invasive method that enables an intuitive full-field representation of stress in the instantaneous flow field in a microfluidic device.read more
Citations
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Simple multi-wavelength imaging of birefringence:case study of silk.
Reo Honda,Meguya Ryu,Jingliang Li,Vygantas Mizeikis,Saulius Juodkazis,Saulius Juodkazis,Junko Morikawa +6 more
TL;DR: In this article, the authors used polarised light imaging microscopy with the addition of a liquid crystal phase retarder to determine the birefringence of silk fibres with high (∼1 μm) spatial resolution.
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Steady viscoelastic flow around high-aspect-ratio, low-blockage-ratio microfluidic cylinders
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Flow of wormlike micellar solutions around microfluidic cylinders with high aspect ratio and low blockage ratio
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References
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Journal ArticleDOI
PIVlab – Towards User-friendly, Affordable and Accurate Digital Particle Image Velocimetry in MATLAB
William Thielicke,Eize Stamhuis +1 more
TL;DR: The accuracy of several algorithms was determined and the best performing methods were implemented in a user-friendly open-source tool for performing DPIV flow analysis in Matlab.
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Creeping flow of dilute polymer solutions past cylinders and spheres
M.D. Chilcott,J.M. Rallison +1 more
TL;DR: In this article, a dilute polymer solution is modelled as a suspension of dumbbells with finite extensibility, and time-dependent numerical calculations are performed of flow part cylindrical and spherical surfaces at low Reynolds number.
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Crosslinking Effect on Polydimethylsiloxane Elastic Modulus Measured by Custom-Built Compression Instrument
TL;DR: In this paper, a macroscopic compression test utilizing a simple custom-built instrument was employed to measure polydimethylsilox-ane (PDMS) elastic modulus.
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