Drag Reduction Effect of Microbubble/Water Mixtures and Complex Fluids into Capillary Flows

Ushida, Akiomi; Hasegawa, Tomiichi; Narumi, Takatsune; Amaki, Keiko; Kayaba, Ryuichi

doi:10.1678/rheology.40.179

Cited by 4 publications

(3 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These studies discussed the void fraction of FBs, size effect (relation to the diameter), and surface tension between the FB mixtures and capillary wall. They observed no relationship between pseudo-laminarization and bubble size effect, and the electric interaction was discussed by Ushida et al [26]. The present results are similar to the previous results in terms of electric interactions, but we consider the results from a slightly different perspective.…”

Section: Discussionsupporting

confidence: 90%

“…Serizawa et al [25] measured pressure drops of FB mixtures in capillary flows with inner diameters of 6 mm. Ushida et al [26] conducted similar experiments in smaller capillary flows with inner diameters of <1 mm. These studies discussed the void fraction of FBs, size effect (relation to the diameter), and surface tension between the FB mixtures and capillary wall.…”

Section: Discussionmentioning

confidence: 95%

See 1 more Smart Citation

Flow Properties of Ultra-Fine Bubble Mixtures Passing through Micro-Apertures

Ushida¹,

Hasegawa²,

Narumi³

et al. 2015

JFCMV

Self Cite

View full text Add to dashboard Cite

The flow properties of fine bubble mixture flows are investigated and reported. Few previous studies have focused on ultra-fine bubble (UFB) mixtures, which contain sub-micrometer sized bubbles. In this study, UFB mixtures of water and glycerol solution are passed through micro-sized slits and capillaries, and the resultant pressure drops are evaluated in comparison with those for water and aqueous glycerol alone. The experimentally measured pressure drop for slits (≤51 μm) and capillaries (≤81 μm) is less for UFB mixtures than for water and aqueous glycerol alone. This phenomenon is considered in terms of interface behavior and attributed to the electric interaction between an electric double layer and the UFBs. Furthermore, numerical observation for slip wall conditions is conducted, and the results for UFB mixtures agree with the predicted values for slip wall conditions.

show abstract

Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 95%

Flow Properties of Ultra-Fine Bubble Mixtures Passing through Micro-Apertures

Ushida¹,

Hasegawa²,

Narumi³

et al. 2015

JFCMV

Self Cite

View full text Add to dashboard Cite

show abstract

“…Moreover, spherical micelle surfactant solutions were not observed. On the other hand, drag reduction effect of microbubble mixtures, spherical micelle surfactant solutions, and polymer solutions in "capillary flows" was observed in our previous study 20) , which the diameter ranged from 110 μm to 0.75 mm. Also, it suggested pseudo-laminarization effect for the above test fluids.…”

mentioning

confidence: 71%

Flow Properties of Microbubble Mixtures and Complex Fluids Passing through Micro-Apertures

Ushida

Hasegawa

Sato

et al. 2016

J. Soc. Rheol., Jpn

Self Cite

View full text Add to dashboard Cite

The pressure drops were measured for water, microbubble/water mixtures, and complex fluids (spherical micelle surfactant solution and polymer solution) in flows through micro-apertures (micro-orifices, circular pores, and hexagonal pores). For water, agreement between the resultant pressure drops and the predictions of the NavierStokes equation was obtained. For microbubble/water mixtures, drag reduction effect was suggested over a Reynolds number of about 1.0 × 10 1 in micro-orifice flows. Surfactant solutions exhibited the same results as microbubble/water mixtures. For polymer solutions, significant drag reduction was shown. Moreover, a drag reduction effect, which was independent of the used test fluids, was observed for Reynolds numbers over 1.0 × 10 1 in the flow through circular pores and hexagonal pores. To explain this phenomenon, the size effect, visco-elastic property, electric interaction, and interfacial tension are considered. The results suggest that electric interaction at the wall (interfacial tension) is a contributing factor. In addition, drag reduction rates were estimated. , who derived a mechanism for drag reduction by polymer additives based on elastic theory. Ogata et al. 19)have investigated the effect of surfactant solutions on the flow through a circular cylinder for Re ranging between 10 1 and 10 5 by measuring the drag coefficients and by flow visualizations.As summarized the above studies, channel flows (pipe flows, capillary flows, and rectangular channel flows) were investigated by using several types of fluids, and relationship between their rheological properties (elasticity and viscosity) and the drag reduction effect was reported for the complex fluids (dilute aqueous solutions of polymers and surfactants with wormlike micelles). Additionally, effects of volume fractions and particle diameters generated microbubbles were reported in microbubble drag reduction. However, the used characteristic length was more than 1 millimeter.Relative small size (< 1 mm) was limited. Moreover, spherical micelle surfactant solutions were not observed. On the other hand, drag reduction effect of microbubble mixtures, spherical micelle surfactant solutions, and polymer solutions in "capillary flows" was observed in our previous study 20) , which the diameter ranged from 110 μm to 0.75 mm. Also, it suggested pseudo-laminarization effect for the above test fluids. However, the flows through micron-sized apertures (example for orifice, slit, and pores) were limited. In this study, flows of water, microbubble/water mixtures, spherical micelle surfactant solution, and polymer solution passing through micron-sized apertures (micro-orifices, circular pores, and hexagonal pores) were investigated. Flow properties and the origin of drag reduction effects in the flows through microapertures are discussed by the results. EXPERIMENTAL PROCEDURE Test FluidsFour types of test fluids were used in this study. Deionized water (electric conductivity: 0.055 μS/cm; passed through a filter with pore size 5.0 μm befor...

show abstract

Pseudo-laminarization of surfactant solutions in capillary flows

Ushida

Ichijo

Hasegawa

et al. 2015

Transactions of the JSME (In Japanese)

Self Cite

View full text Add to dashboard Cite

Wormlike micelle surfactant solutions showed turbulent drag reduction effects in pipe flows. It was well-known that SIS (Shear Induced Structure), reported in previous studies, made them. However, inner diameters (characteristic length) of pipes used in the previous studies were in the order of millimeter. Thus, shear rates were limited to the order of 10 4 s −1 at a maximum. In the present study, flow properties of water and wormlike micelle surfactant solutions were investigated at higher shear rates using capillaries whose inner diameters ranged from 133 µm to 2.87 mm. Because the observed Reynolds number estimated for the micron-sized capillaries ranged from 10 2 to 10 4 , drag reduction effects were observed as a pseudo-laminarization, which is a phenomenon that transition from laminar flows to turbulent flows with the increase in the Reynolds number delays. Viscosity measurements using a capillary method indicated that the surfactant solution used in the present study had non-Newtonian viscosity. Therefore, the Reynolds number of the surfactant solution flow was estimated by the generalized Reynolds number. By using a jet thrust method, elastic properties of wormlike micelle surfactant solutions were measured in the corresponding to the viscosity measurement. For water, the resultant pressure drops (the frictional coefficient of pipes) agreed with both the prediction of laminar flows and the Blasius expression.diameters. In other words, these results suggested that the pseudo-laminarization was occurred in the capillary flows. Moreover, the relationship between the shear rate at which the surfactant viscosity asymptotically approached to the water one and the transition to turbulent flows was discussed to clarify their correlation.

show abstract

Drag Reduction Effect of Microbubble/Water Mixtures and Complex Fluids into Capillary Flows

Cited by 4 publications

References 29 publications

Flow Properties of Ultra-Fine Bubble Mixtures Passing through Micro-Apertures

Flow Properties of Ultra-Fine Bubble Mixtures Passing through Micro-Apertures

Flow Properties of Microbubble Mixtures and Complex Fluids Passing through Micro-Apertures

Pseudo-laminarization of surfactant solutions in capillary flows

Contact Info

Product

Resources

About