| 项目编号: | 1510707
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| 项目名称: | UNS: Robust Superhydrophobic Surfaces for Enhanced Propulsive Performance and Maneuverability at Intermediate Reynolds Number |
| 作者: | Paul Krueger
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| 承担单位: | Southern Methodist University
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| 批准年: | 2014
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| 开始日期: | 2015-08-01
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| 结束日期: | 2018-07-31
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| 资助金额: | USD340000
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| 资助来源: | US-NSF
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| 项目类别: | Continuing 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: | superhydrophobic surface
; gas film
; surface
; flapping-fin
; intermediate reynolds number
; propulsive performance
; apparent slip
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| 英文摘要: | #1510707
Krueger, Paul S.
The goal of this proposal is to improve propulsion by using superhydrophobic surfaces. A surface is defined as superhydrophobic when water droplets bead on the surface, and the angle between the drop and the surface is larger than 150 degrees. In cases like this, one can achieve drag reduction, since water slips on the superhydrophobic surface, and energy savings can be realized in propulsion.
The introduction of apparent slip at the superhydrophobic surface using gas trapped near the surface by the microtexture of the surface can lead to drag reduction. However, it is known that such surfaces have their own challenges, including collapse of the gas film under increased hydrostatic or dynamic pressure, gradual depletion of the gas film by diffusion, and slip lengths limited by the spacing of the microtexture features. The proposed effort seeks to expand the applicability of superhydrophobic surfaces by pressurizing the gas film, which will allow for robust stabilization of the gas film against pressure disturbances and diffusion. Pneumatic stabilization has the additional advantages that changing the gas film pressure will allow mictotextured features to be spaced further apart, increasing the apparent slip, and dynamic variation of the pressure will allow for direct control of the surface behavior, including re-initialization of the gas film. Pneumatically controlled surfaces will be constructed from polydimethylsiloxane using laser micromachining and soft lithography techniques and tested on flapping-fin and pulsed-jet propulsion methods at intermediate Reynolds number (Re) flows. The effect of apparent slip introduced by the superhydrophobic surfaces on the propulsive performance of flow fields generated by flapping-fin and pulsed-jet propulsion will be investigated as a function of Re. The ability to dynamically actuate the gas film will also be investigated. A secondary outcome would be an improved technical capability in developing and sustaining superhydrophobic surfaces broadening the areas of their application to other cases of drag reduction and self-cleaning surfaces. Activities on undergraduate education through summer immersion were proposed and a web-based tutorial on mechanical and biological propulsion will be developed and made available to students and the community. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/93915
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| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
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| Recommended Citation: | |
Paul Krueger. UNS: Robust Superhydrophobic Surfaces for Enhanced Propulsive Performance and Maneuverability at Intermediate Reynolds Number. 2014-01-01.
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