2007 Fiscal Year Final Research Report Summary
Development of Practical Simulation Technology of Turbulence in Viscoelastic Fluid
| Project/Area Number |
17560166
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Fluid engineering
|
|---|
| Research Institution | Tokyo University of Science |
|---|
Principal Investigator |
KAWAGUCHI Yasuo Tokyo University of Science, Faculty of Science and Technology, Professor (20356835)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
KAWAMURA Hiroshi Tokyo University of Science, Faculty of Science and Technology, Professor (80204783)
SEGAWA Takehiko Tokyo University of Science, Advanced Institute of Industrial Science and Technology, Energy Technology Research Institute, Researcher (50357315)
|
|---|
| Project Period (FY) |
2005 – 2007
|
| Keywords | Turbulence / Non-Newtonian Fluid / Drag Reduction / Laser Measurement / Direct Numerical Simulation / RANS model |
|---|
| Research Abstract |
It is known that the viscoelastic fluid such as dilute surfactant or polymer aqueous solution exhibits dramatic frictional drag up to 80% by turbulent suppression effect in high Reynolds number flow. In this project, the target is to develop an ensemble average model (RANS=Reynolds averaged Navier-Stokes equation) applicable to viscoelastic fluid flow.
During the investigation, detailed Laser measurement of flow was performed and spatial structure of turbulence in the drag reducing flow was captured. Increasing Reynolds number drag reduction rate once gradually increases and then decrease. This characteristic was explained from the view of turbulent structure change. Rheological properties of the drag reducing fluid were measured and they were approximated well by the Gieskus Model. Based on this constitutive equation, Direct Numerical Simulation (DNS) of turbulence were made. Budget terms composing the conservation equation of turbulence energy were evaluated. The differences from normal Newtonian fluid turbulence were clarified. In addition, it was tried to explain the drag reduction characteristics from the existence of non-effective layer near the wall.
The present study shed light to the drag reducing mechanism by additives. About the RANS model, eddy diffusivity model including the effect of relaxation time was introduced. This RANS model reproduces the result of DNS in wide range of the parameters. Therefore, this model is expected to be a useful tool for designing the high efficiency district heating/cooling system or air-conditioning system of buildings which uses drag reducing fluid.
|
Research Products
(72 results)
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
[Journal Article] Synthesis of aminimides derived from oleic acid : a new family of drag-reducing surfactants2006
Author(s)
Oba, G., Coleman, B. E., Hart, D. J., Zakin, J. L., Zhang, Y., Kawaguchi, Y., Talmon, Y.
-
Journal Title
Tetrahedron 62-43
Pages: 10193-10201
Description
「研究成果報告書概要(和文)」より
Peer Reviewed
-
-
-
-
-
-
-
-
-
[Journal Article] Synthesis of aminimides derived from oleic acid: a new family of drag-reducing surfactants2006
Author(s)
Oba, G, Coleman, B. E., Hart, D. J., Zakin, J. L., Zhang, Y, Kawaguchi, Y, Talmon, Y
-
Journal Title
Tetrahedron 62-43
Pages: 10193-10201
Description
「研究成果報告書概要(欧文)」より
-
[Journal Article] The Computed Characteristics of Turbulent Flow and Convection in Concentric Circular Annuli : Part II. Uniform Heating on the Inner Surface2005
Author(s)
Yu, B., Kawaguchi, Y., Kaneda, M., Ozoe, H., Churchill, S. W.
-
Journal Title
International Journal of Heat and Mass Transfer 48-3, 4
Pages: 621-634
Description
「研究成果報告書概要(和文)」より
Peer Reviewed
-
-
-
-
-
[Journal Article] Biaxial Extensional Characteristics of Drag-Reducing Surfactant Solution2005
Author(s)
Nguyen, H. P., Ishihara, K., Suzuki, H., Kawaguchi, Y., Usui, H.
-
Journal Title
Nihon Reoroji Gakkaishi (Journal of the Society of Rheology, Japan) 33-3
Pages: 145-150
Description
「研究成果報告書概要(和文)」より
Peer Reviewed
-
-
-
-
-
-
-
-
[Journal Article] The Computed Characteristics of Turbulent Flow and Convection in Concentric Circular Annuli: Part II. Uniform Heating on the Inner Surface2005
Author(s)
Yu, B., Kawaguchi, Y., Kaneda, M, Ozoe, H., Churchill, S. W.
-
Journal Title
International Journal of Heat and Mass Transfer 48-3, 4
Pages: 621-634
Description
「研究成果報告書概要(欧文)」より
-
-
-
-
-
-
-
-
-
-
-
-
[Presentation] Direct numerical simulation on drag reducing flow by polymer additives using a spring-dumbbell model2007
Author(s)
Wang, Y., Yu, B., Zhang, J. J., Wei, J. J., Li, F-C., Kawaguchi, Y.
Organizer
Asian Symposium on Computational Heat Transfer and Fluid Flow
Place of Presentation
西安・中国
Year and Date
20071000
Description
「研究成果報告書概要(和文)」より
-
-
-
[Presentation] Direct numerical simulation on drag reducing flow by polymer additives using a spring-dumbbell model2007
Author(s)
Wang, Y, Yu, B., Zhang, J. J., Wei, J. J., Li, FC., Kawaguchi, Y
Organizer
Asian Symposium on Computational Heat Transfer and Fluid Flow
Place of Presentation
Xi'an China
Year and Date
20071000
Description
「研究成果報告書概要(欧文)」より
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
