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Rheological evaluation of complex fluids using ultrasonic spinning rheometry in an open container

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Title: Rheological evaluation of complex fluids using ultrasonic spinning rheometry in an open container
Authors: Yoshida, Taiki Browse this author
Tasaka, Yuji Browse this author →KAKEN DB
Murai, Yuichi Browse this author →KAKEN DB
Issue Date: 20-Apr-2017
Publisher: American Institute of Physics
Journal Title: Journal of Rheology
Volume: 61
Issue: 3
Start Page: 537
End Page: 549
Publisher DOI: 10.1122/1.4980852
Abstract: We propose a rheometry using ultrasonic velocity profiling (UVP) that visualizes and evaluates quantitatively opaque complex fluids in a cylindrical open vessel performing unsteady rotation. The methodology termed “ultrasonic spinning rheometry (USR)” is expected to provide details of various rheological properties. In our study of USR applications, an enhancement in measuring some rheological properties was achieved for three different non-Newtonian fluids. For quantitative evaluations, we focused on momentum propagation in unsteady shear flows from an oscillating cylindrical container. In such flows, this propagation is represented in the radial profiles of the phase lag of velocity fluctuations. The phase lag information is obtained by a discrete Fourier transform of the spatio-temporal velocity distributions measured using UVP and indicates that the phase lag changes substantially as rheological properties change in a test fluid. As the primary rheological property, a local effective viscosity that is representative of the Newtonian viscosity in the bulk of a measurement volume is determined using UVP. In addition, the shear stress distribution, yield stress, spatial viscosity profile, and shear modulus are obtained as secondary rheological properties.
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)

Submitter: 田坂 裕司

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