Patent ID: 6193191
Filing Date: 2001-02-27
Classification: B64C,F15D,Y02T

Abstract:
A surface geometry which is at least part of an inner surface in a pipe which inhibits turbulence in the pipe in which fluid moves within the pipe, the surface geometry comprising:a first series of turbulence inhibiting surfaces in a boundary layer of the fluid in a vicinity of the pipe, the first series of turbulence inhibiting surfaces extending longitudinally in a direction of flow of the fluid and having an amplitude a, and a second series of turbulence inhibiting surfaces having an amplitude a.sub.2 which are superimposed on the first series of turbulence inhibiting surfaces with the first series of turbulence inhibiting surfaces inhibiting turbulence of a first amplitude and the second series of turbulence inhibiting surfaces inhibiting turbulence of a second amplitude less than the first amplitude, the amplitude a, being greater than the amplitude a.sub.2 with the amplitude a, being measured with respect to a base surface of the first series of turbulence inhibiting surfaces and the amplitude a.sub.2 being measured with respect to a base surface of the second series of turbulence inhibiting surfaces and the base surface of the first series of turbulence inhibiting surfaces having a polygonal profile comprising n straight sides wherein n is .gtoreq.3 and a plurality of vertices subtending an angle formed between adjacent straight sides of the polygon.