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Gas film resistance reducing model for super-hydrophobic surface

A super-hydrophobic surface, super-hydrophobic technology, applied in applications, ship construction, ships, etc., can solve problems such as the disappearance of the gas film, the inability to use underwater vehicles, and the reduced drag reduction effect.

Active Publication Date: 2018-09-28
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the water flows on the surface of the material, the gas in the microstructure of the material surface is squeezed out by the water, the gas film no longer exists, and the drag reduction effect decreases
[0003] The patent document with the application number 201510136084.6 adopts the transverse deflector device on the bottom groove of the ship, and uses the fan on the ship to input air to the bottom of the ship to form a continuous thin air film, so as to realize the drag reduction and energy saving of the ship air film, but it cannot be used for underwater navigation. device
The gas film drag-reducing layer of the patent document with application number 201510579215.8 is composed of hydrophilic regions and hydrophobic regions, which can maintain the existence of the gas film for a certain period of time, but the gas film is disposable and cannot be replenished in time
The patent document with the application number 201611112056.1 uses a DC power supply to electrolyze water to generate gas to form a gas film to achieve drag reduction effect, but this structure requires an additional DC power supply to provide energy, which is inconvenient to apply

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0051]In this example, a superhydrophobic surface consisting of rows of parallel grid-shaped grooves was prepared by hot embossing on the surface of polytetrafluoroethylene, wherein there were metal wires perpendicular to the grooves at the bottom of the grooves. The specific steps are as follows: Place the mold, positive electrode metal wire, negative electrode metal wire, polytetrafluoroethylene sheet, flat glass and pressure device on the heating plate sequentially from bottom to top. Heat the mold to 285°C. After 3 minutes, when the polytetrafluoroethylene sheet is in a fluid state, apply a certain pressure to fill the polytetrafluoroethylene into the mold. After cooling and demolding, a super-hydrophobic surface is obtained. Wherein, the depth of the groove is 150 μm, the width of the groove is 50 μm, the ratio of the depth of the groove to the width of the groove is 3, and the distance between adjacent grooves is 25 μm. The positive metal wire and the negative metal wire...

Embodiment 2

[0053] In this example, a superhydrophobic surface consisting of rows of parallel grid-shaped grooves was prepared by hot embossing on the surface of polytetrafluoroethylene, wherein there were metal wires perpendicular to the grooves at the bottom of the grooves. The specific steps are as follows: Place the mold, positive electrode metal wire, negative electrode metal wire, polytetrafluoroethylene sheet, flat glass and pressure device on the heating plate sequentially from bottom to top. Heat the mold to 285°C. After 3 minutes, when the polytetrafluoroethylene sheet is in a fluid state, apply a certain pressure to fill the polytetrafluoroethylene into the mold. After cooling and demolding, a super-hydrophobic surface is obtained. Wherein, the depth of the groove is 150 μm, the width of the groove is 100 μm, the ratio of the depth of the groove to the width of the groove is 1.5, and the distance between adjacent grooves is 25 μm. The positive metal wire and the negative metal ...

Embodiment 3

[0055] In this example, a superhydrophobic surface consisting of rows of parallel grid-shaped grooves was prepared by hot embossing on the surface of polytetrafluoroethylene, wherein there were metal wires perpendicular to the grooves at the bottom of the grooves. The specific steps are as follows: Place the mold, positive electrode metal wire, negative electrode metal wire, polytetrafluoroethylene sheet, flat glass and pressure device on the heating plate sequentially from bottom to top. Heat the mold to 285°C. After 3 minutes, when the polytetrafluoroethylene sheet is in a fluid state, apply a certain pressure to fill the polytetrafluoroethylene into the mold. After cooling and demolding, a super-hydrophobic surface is obtained. Wherein, the depth of the groove is 150 μm, the width of the groove is 150 μm, the ratio of the depth of the groove to the width of the groove is 1, and the distance between adjacent grooves is 25 μm. The positive metal wire and the negative metal wi...

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Abstract

The invention belongs to the technical field of underwater resistance reducing, and particularly relates to a gas film resistance reducing model for a super-hydrophobic surface. In the gas film resistance reducing model for the super-hydrophobic surface, when gas in a groove is extruded by seawater, first metal and second metal which are different in activity make contact with the seawater, the seawater serves as an electrolyte, the first metal and the second metal serve as a positive pole and a negative pole, and thus a galvanic cell is formed; hydrogen ions in the seawater obtain electrons on the positive pole to form hydrogen, the whole groove is filled with the hydrogen after the hydrogen diffuses, thus a gas film is formed, the positive pole and the electrolyte are separated by the gas film at this time, the galvanic cell is broken, and gas generating is stopped; when the gas in the groove is extruded by the seawater again, the positive pole and the negative pole make contact withthe seawater, the galvanic cell is formed again, and gas is generated; and so repeatedly, the gas can exist on the surface of an super-hydrophobic base material for a long time, existing of the gas film is ensured, and the resistance reducing effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of underwater drag reduction, and in particular relates to a super-hydrophobic surface air film drag reduction model. Background technique [0002] 70% to 80% of the energy consumption of existing vehicles such as ships and airplanes is used to overcome the frictional resistance between them and the contact medium, especially in the operation of underwater vehicles such as submarines and torpedoes. Frictional resistance not only determines the The endurance of the aircraft itself also affects the national defense capabilities of the country. The microstructure on the surface of the super-hydrophobic material can store part of the gas. When the super-hydrophobic material is underwater, the gas forms a "gas film" between the water and the material interface, which reduces the friction between the two and plays a good role. drag reduction effect. However, as the water flows on the surface of the material, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B63B1/38B29C59/02B29L7/00B29K27/18
CPCB63B1/38B29C59/022B29K2027/18B29L2007/00B63B2001/387Y02T70/10
Inventor 付强彭磊林木松
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID