caa a22 4500 606197168 CHVBK 20210128100928.0 cr unu---uuuuu 210128e20150101xx s 000 0 eng 10.1007/s00348-014-1867-5 doi (NATIONALLICENCE)springer-10.1007/s00348-014-1867-5 Estimating the effective viscosity of bubble suspensions in oscillatory shear flows by means of ultrasonic spinning rheometry [Elektronische Daten] [Y. Tasaka, T. Kimura, Y. Murai] 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, $$\hbox{Ca}_{\rm rms}$$ Ca rms , is an important indicator to distinguish regimes in estimating the effective viscosity: Unsteady flows having larger $$\hbox{Ca}_{\rm rms}$$ Ca rms 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. Springer-Verlag Berlin Heidelberg, 2014 Tasaka Y. Laboratory for Flow Control, Faculty of Engineering, Hokkaido University, N13 W8, 060-8628, Sapporo, Japan aut Kimura T. Laboratory for Flow Control, Faculty of Engineering, Hokkaido University, N13 W8, 060-8628, Sapporo, Japan aut Murai Y. Laboratory for Flow Control, Faculty of Engineering, Hokkaido University, N13 W8, 060-8628, Sapporo, Japan aut Experiments in Fluids Springer Berlin Heidelberg 56/1(2015-01-01), 1-13 0723-4864 56:1<1 2015 56 348 https://doi.org/10.1007/s00348-014-1867-5 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-014-1867-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tasaka Y. Laboratory for Flow Control, Faculty of Engineering, Hokkaido University, N13 W8, 060-8628, Sapporo, Japan aut NATIONALLICENCE 700 1- Kimura T. Laboratory for Flow Control, Faculty of Engineering, Hokkaido University, N13 W8, 060-8628, Sapporo, Japan aut NATIONALLICENCE 700 1- Murai Y. Laboratory for Flow Control, Faculty of Engineering, Hokkaido University, N13 W8, 060-8628, Sapporo, Japan aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/1(2015-01-01), 1-13 0723-4864 56:1<1 2015 56 348