Methods of Restoring and Maintaining Gas Film on Superhydrophobic Surfaces while Underwater
- 技术优势
- Reduction of frictional drag under laminar and turbulent flow conditions Lower fuel costs Increase speed Prevent solid surface damage
- 技术应用
- Water craft manufacturing Water sports including surfing, wind sailing, water skis, etc. Any physical device that functions in water
- 详细技术说明
- Researchers at UCLA have identified methods to re-establish a gas film on a structured hydrophobic surface underwater when the gas film is disrupted or depleted. The new methods immediately restore the gas film when a breakdown begins, thereby ensuring that a gas film is sustained for a sufficiently long time under various harsh conditions.
- *Abstract
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UCLA researchers in the Department of Mechanical and Aerospace Engineering have developed a method of maintaining and restoring a gas film on a superhydrophobic surface while underwater.
- *Principal Investigation
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Name: Chang-Jin Kim
Department:
Name: Choongyeop Lee
Department:
- 附加资料
- Patent Number: US20130122195A1
Application Number: US13811272A
Inventor: Kim, Chang-Jin | Lee, Choongyeop
Priority Date: 27 Jul 2010
Priority Number: US20130122195A1
Application Date: 20 Jan 2013
Publication Date: 16 May 2013
IPC Current: B05D000500 | B05C000700 | B05C000900 | C25D000900 | C25D001700
US Class: 427237 | 204267 | 205080 | 4272481 | 428141
Assignee Applicant: The Regents of the University of California
Title: METHOD AND DEVICE FOR RESTORING AND MAINTAINING SUPERHYDROPHOBICITY UNDER LIQUID
Usefulness: METHOD AND DEVICE FOR RESTORING AND MAINTAINING SUPERHYDROPHOBICITY UNDER LIQUID
Summary: Super hydrophobic surface for immersing in liquid i.e. water, provided on an interior pipe surface and a vessel hull (all claimed) that is propelled in a water environment e.g. marine vessel and submarine.
Novelty: Super hydrophobic surface for immersing in liquid i.e. water, provided on e.g. vessel hull, has gas generator provided within micro features, and generating gas in between micro features
- 主要类别
- 化工/材料
- 细分类别
- 化工/材料应用
- 其他
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State Of Development
The current methods have been demonstrated and experimentally verified using superhydrophobic surfaces.
Background
A liquid interfaced directly with a solid creates frictional forces. For example, these frictional forces slow down a boat traveling through the water and require it to use more power and fuel. A gas film layer between the solid and liquid interfaces would act to reduce frictional forces because the frictional drag of a liquid flowing over a gas film is lower than that of a liquid flowing directly over a solid.
Despite its usefulness, such a gas film layer is thermodynamically unstable. The gas film destabilizes from many different factors, including high liquid pressure, gas diffusion into the liquid, or physical defects on the surface - all of which are inevitable in most real life applications. Past research in the field focused on how to make the superhydrophobic surfaces more robust to prevent the gas film from destabilizing. None were directed at restoring and maintaining the gas film once it is disturbed.Additional Technologies by these Inventors
- Complete Transfer of Liquid Drops by Modification of Nozzle Design
- Micropumping of Liquids by Directional Growth and Selective Venting of Bubbles
- High-speed Switching of Droplet by Electric Meniscus Actuation
- Selective Surface Coating and/or Treatment of Printing Pins
- On-chip, Real-time Feedback Control for Electrical Manipulation of Droplets
- Localized Droplet Heating with Surface Electrodes in Microfluidic Chips
- No-Assembly Devices for Microfluidics Inside a Cavity
- Membraneless Fuel Cell with Self-Pumped Fuel and Oxidant
- Microstructured Cathode for Self-Regulated Oxygen Generation and Consumption
- Liquid-Repellent Surfaces Made of Any Materials
- A Low-Profile Flow Shear Sensing Unit
- Method for Commercial Production of Super-Hydrophobic Materials
- Method of Fluid Manipulation By Electrodewetting
Tech ID/UC Case
22142/2011-040-0
Related Cases
2011-040-0
- 国家/地区
- 美国
