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

Tasaka, Y.; Kimura, T.; Murai, Y.

Experiments in fluids, 2015, 56(1), 1867

Permalink : https://hdl.handle.net/2115/60405

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アクセス権
open access
URI
https://hdl.handle.net/2115/60405
タイトル
Estimating the effective viscosity of bubble suspensions in oscillatory shear flows by means of ultrasonic spinning rheometry
著者
Tasaka, Y. ; Kimura, T. ; Murai, Y.
e-Rad_Researcher
00419946
著者名
Tasaka, Y.
e-Rad_Researcher
90261338
著者名
Kimura, T.
著者名
Murai, Y.
言語
英語
発行日
2015-01
出版者
Springer
収録物名
Experiments in fluids
巻(号)
56(1)
ページ
1867
抄録
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.
資源タイプ
学術雑誌論文
出版タイプ
Accepted Manuscript
権利情報
The final publication is available at Springer via http://dx.doi.org/10.1007/s00348-014-1867-5.
PISSN
0723-4864
関連情報 (isVersionOf)
出版社版DOI
https://doi.org/10.1007/s00348-014-1867-5