Reduced fluid drag across a solid surface with a textured coating
AssigneeGeneral Electric Company
InventorsRahul Anil BIDKAR, Ambarish Jayant KULKARNI, Luc Stephane LEBLANC, Vaibhav BAHADUR
Life of this patent
Estimating the term…
Abstract
An article includes a substrate with a coating having asperities such that an average spacing between the asperities is between about 0.01 and about 1.5 micron. An average surface roughness of the coating is up to about 2 microns, and an average porosity of the coating is in the range from about 35% to about 70%. A material to reduce surface energy is disposed on the coating. A method for making such an article and a method for decreasing fluid drag across such an article are also provided.
Claims26
An article comprising:
- a substrate;
- a coating disposed on the substrate, the coating comprising a plurality of asperities, wherein the coating has an average spacing between asperities in the range from about 0.01 micron to about 1.5 micron, an average surface roughness of up to about 2 microns, and an average porosity in the range from about 35% to about 70%;
- and a material to reduce surface energy is disposed on the coating.
A method for making an article, comprising:
- disposing a coating on a substrate, the coating comprising a plurality of asperities, wherein the coating has an average spacing between asperities in the range from about 0.01 micron to about 1.5 micron, an average surface roughness of up to about 2 microns, and an average porosity in the range from about 35% to about 70%;
- and disposing on the coating a material to reduce surface energy.
A method for decreasing fluid drag across a solid surface comprising:
- causing a fluid to flow over the surface of an article such that a local viscous sub-layer of the fluid is in contact with the surface, wherein the article comprises
- a substrate,
- a coating disposed on the substrate, the coating comprising a plurality of asperities, wherein the coating has an average spacing between asperities in the range from about 0.01 micron to about 1.5 micron, an average surface roughness of up to about 10% of the thickness of the local viscous sub-layer, and an average porosity in the range from about 35% to about 70%, and
- a material to reduce surface energy disposed on the coating,
- wherein the material to reduce surface energy is disposed to contact the fluid as the fluid flows over the surface of the article.
Dependencies are inferred from the claim text.