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Applicability evaluation of the stress-optic law in Newtonian fluids toward stress field measurements

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Title: Applicability evaluation of the stress-optic law in Newtonian fluids toward stress field measurements
Authors: Noto, Daisuke Browse this author
Tasaka, Yuji Browse this author →KAKEN DB
Hitomi, Jumpei Browse this author
Murai, Yuichi Browse this author →KAKEN DB
Issue Date: 21-Oct-2020
Publisher: American Physical Society (APS)
Journal Title: Physical Review Research
Volume: 2
Issue: 4
Start Page: 43111
Publisher DOI: 10.1103/PhysRevResearch.2.043111
Abstract: A novel rheoscopic fluid displaying coloration due to flow-induced birefringence is investigated through laboratory experiments to ascertain if it satisfies the stress-optic law in fluids in direct stress field measurements of Newtonian fluids. To validate this experimentally, two types of spin-up experiments ensuring two-dimensional flows were performed: color visualization using the rheoscopic fluid and velocity field measurement by particle image velocimetry. Using a wave-number analysis, the orientation angle of the birefringence was determined from a single color snapshot in axisymmetric and unidirectional flows. Direct comparisons between color and shear stress values made it possible to establish a unique relation between the two, verifying that the stress-optic law can be applied in the fluid. The results of the present study suggest a promising avenue toward enabling temporally and spatially resolved stress field measurements in Newtonian fluids.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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