| 项目编号: | 1604978
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| 项目名称: | Modification of Near-Wall, High-Reynolds Number Velocity Profiles With Polymer Solution |
| 作者: | Brian Elbing
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| 承担单位: | Oklahoma State University
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| 批准年: | 2016
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| 开始日期: | 2016-08-01
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| 结束日期: | 2019-07-31
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| 资助金额: | 297234
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| 资助来源: | US-NSF
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| 项目类别: | Standard Grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Engineering - Chemical, Bioengineering, Environmental, and Transport Systems
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| 英文关键词: | polymer
; polymer injection
; polymer property
; near-wall region
; near-wall
; polymer ocean
; non-homogeneous polymer concentration field
; brianproposal number
; reynolds number effect
; fluid velocity
; velocity shift
; profile
; high-school student
; reynolds number
; high-reynolds number turbulent boundary layer
; weissenberg number
; polymer effect
; pi
; drag-reducing polymer solution
; first generation high school student
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| 英文摘要: | PI: Elbing, Brian
Proposal Number: 1604978
The addition of a very small amount of polymers to a fluid can result in a dramatic reduction of friction for turbulent flows. It is proposed to conduct state-of-the-art experiments in a newly built facility to obtain an extensive amount of detailed data for the process at different conditions, and then develop a predictive model for the polymer effects on the fluid velocity. Drag reduction with polymers can be used to save energy for fluid transportation over long distances, e.g., for oil pipelines. It can also reduce energy costs for ocean faring vehicles (ships and submarines).
The proposed research is to investigate how drag-reducing polymer solutions modify the near-wall region of a high-Reynolds number turbulent boundary layer. While this has been thought to be understood for decades, recent numerical and experimental data show significant deviation from the classical view. Available data shows a non-universal behavior when the drag reduction is above 40%, which can only be partially explained by a Reynolds number effect. Consequently, the behavior must be dependent on polymer properties. Thus, this project will focus on characterizing the near-wall region at various values of drag reduction, Reynolds number and polymer properties (i.e., Weissenberg number, viscosity ratio, and length ratio). The first objective is to perform this characterization in a polymer ocean to eliminate the influence of a non-homogeneous polymer concentration field. Then testing will be repeated with polymer injection to assess the sensitivity of the profiles to the homogeneity of the concentration field. Finally, the ultimate profile, an empirically derived upper limit for the velocity shift, will be reexamined in both a polymer ocean and with polymer injection to determine the validity of numerical and experimental observations that the profile is not logarithmic. It will also be examined under what conditions this profile can actually be exceeded. In addition to graduate and undergraduate student participation, high-school students will be engaged in research through the PI's involvement with the job-shadowing component of Oklahoma State University's Upward Bound program, which is focused on low-income and/or first generation high school students. Each year, up to 3 of these students would work with the PI for 6 weeks. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/91674
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| Appears in Collections: | 全球变化的国际研究计划
科学计划与规划
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| Recommended Citation: | |
Brian Elbing. Modification of Near-Wall, High-Reynolds Number Velocity Profiles With Polymer Solution. 2016-01-01.
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