|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||137/810 ; 137/809 ; 137/811 ; 137/826 ; 137/833|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 2 인용 특허 : 5|
Skin friction reduction on a surface moving relative to a fluid can be obtained by ejecting a polymer-water mixture/solution into the boundary layer. The efficacy of the ejected polymer-water mixture/solution is closely related to polymer dissipation out of the boundary layer and conditioning (i.e, lenthening, unwinding or stretching) of the polymer molecules by liquid shear forces immediately before ejection. The invention is a method and apparatus for conditioning and ejecting a polymer-water mixture/solution that improves drag reduction characteristic...
[ What is claimed is:] [1.]1. An apparatus which ejects a substance in a fluid into a boundary layer region of a fluid flowing along a wall, said apparatus comprising:a first slot ejector in the wall having, on the upstream side of the first slot ejector, a concave surface over which fluid flowing through the first slot ejector flows so as to create Goertler vortices; anda convex Coanda surface on the downstream side of the first slot ejector, said convex Coanda surface exhibiting the Coanda effect, that is, causing adherence along the Coanda surface in ...