Pseudo-laminarization of surfactant solutions in capillary flows
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 mill...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | Japanese |
| Published: |
The Japan Society of Mechanical Engineers
2015-02-01
|
| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/81/823/81_14-00278/_pdf/-char/en |
| _version_ | 1828098772327989248 |
|---|---|
| author | Akiomi USHIDA Akira ICHIJO Tomiichi HASEGAWA Takatsune NARUMI Ryuichi KAYABA |
| author_facet | Akiomi USHIDA Akira ICHIJO Tomiichi HASEGAWA Takatsune NARUMI Ryuichi KAYABA |
| author_sort | Akiomi USHIDA |
| collection | DOAJ |
| description | 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 104s-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 102 to 104, 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. Laminar flows were maintained up to 4.2×103 of the Reynolds number in surfactant solutions, independently of the used 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. |
| first_indexed | 2024-04-11T08:07:11Z |
| format | Article |
| id | doaj.art-a614c2dac4ce410e81723ff516fd5000 |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-11T08:07:11Z |
| publishDate | 2015-02-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-a614c2dac4ce410e81723ff516fd50002022-12-22T04:35:29ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612015-02-018182314-0027814-0027810.1299/transjsme.14-00278transjsmePseudo-laminarization of surfactant solutions in capillary flowsAkiomi USHIDA0Akira ICHIJO1Tomiichi HASEGAWA2Takatsune NARUMI3Ryuichi KAYABA4Department of Mechanical and Production Engineering, Faculty of Engineering, Niigata UniversityGraduate School of Science and Technology, Niigata UniversityNiigata College of TechnologyDepartment of Mechanical and Production Engineering, Faculty of Engineering, Niigata UniversityDepartment of Mechanical and Production Engineering, Faculty of Engineering, Niigata UniversityWormlike 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 104s-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 102 to 104, 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. Laminar flows were maintained up to 4.2×103 of the Reynolds number in surfactant solutions, independently of the used 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.https://www.jstage.jst.go.jp/article/transjsme/81/823/81_14-00278/_pdf/-char/encapillarywatersurfactant solutionpressure droppseudo-laminarization |
| spellingShingle | Akiomi USHIDA Akira ICHIJO Tomiichi HASEGAWA Takatsune NARUMI Ryuichi KAYABA Pseudo-laminarization of surfactant solutions in capillary flows Nihon Kikai Gakkai ronbunshu capillary water surfactant solution pressure drop pseudo-laminarization |
| title | Pseudo-laminarization of surfactant solutions in capillary flows |
| title_full | Pseudo-laminarization of surfactant solutions in capillary flows |
| title_fullStr | Pseudo-laminarization of surfactant solutions in capillary flows |
| title_full_unstemmed | Pseudo-laminarization of surfactant solutions in capillary flows |
| title_short | Pseudo-laminarization of surfactant solutions in capillary flows |
| title_sort | pseudo laminarization of surfactant solutions in capillary flows |
| topic | capillary water surfactant solution pressure drop pseudo-laminarization |
| url | https://www.jstage.jst.go.jp/article/transjsme/81/823/81_14-00278/_pdf/-char/en |
| work_keys_str_mv | AT akiomiushida pseudolaminarizationofsurfactantsolutionsincapillaryflows AT akiraichijo pseudolaminarizationofsurfactantsolutionsincapillaryflows AT tomiichihasegawa pseudolaminarizationofsurfactantsolutionsincapillaryflows AT takatsunenarumi pseudolaminarizationofsurfactantsolutionsincapillaryflows AT ryuichikayaba pseudolaminarizationofsurfactantsolutionsincapillaryflows |