HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Engineering / Faculty of Engineering >
Peer-reviewed Journal Articles, etc >

Estimating the effective viscosity of bubble suspensions in oscillatory shear flows by means of ultrasonic spinning rheometry

Files in This Item:
bubblerheology_rev_.pdf837.65 kBPDFView/Open
Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/60405

Title: Estimating the effective viscosity of bubble suspensions in oscillatory shear flows by means of ultrasonic spinning rheometry
Authors: Tasaka, Y. Browse this author →KAKEN DB
Kimura, T. Browse this author →KAKEN DB
Murai, Y. Browse this author
Issue Date: Jan-2015
Publisher: Springer
Journal Title: Experiments in fluids
Volume: 56
Issue: 1
Start Page: 1867
Publisher DOI: 10.1007/s00348-014-1867-5
Abstract: We have proposed a novel methodology using ultrasonic velocity profiling to estimate the effective viscosity of bubble suspensions that are accompanied by non-equilibrium bubble deformations in periodic shear flows. The methodology was termed "ultrasonic spinning rheometry" and validated on measurement of the effective viscosity of particle suspensions that has a semi-empirical formula giving good estimation of the actual viscosity. The results indicated that the proposed technique is valid for particle volume fractions below 3.0 %. Applying this to bubble suspensions suggested that the effective value of temporal variations in the capillary number, Carms, is an important indicator to distinguish regimes in estimating the effective viscosity: Unsteady flows having larger Carms number than the critical capillary number for the deformation of bubbles are categorized into Regime 2 that includes both highly unsteady conditions and large steady deformation of bubbles.
Rights: The final publication is available at Springer via http://dx.doi.org/10.1007/s00348-014-1867-5.
Type: article (author version)
URI: http://hdl.handle.net/2115/60405
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

Export metadata:

OAI-PMH ( junii2 , jpcoar )

MathJax is now OFF:


 

Feedback - Hokkaido University