Method and apparatus for reducing drag and noise associated with fluid flow in a conduit
Patent 5074324 Issued on December 24, 1991. Estimated Expiration Date: 
July 12, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 12, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3099993 3143124 Apparatus and method for transferring a Bingham solid through a long conduit Corrugated pipe Patent #: 4852616 InventorApplicationNo. 729743 filed on 07/12/1991US Classes:137/13, Affecting flow by the addition of material or energy137/803, FLOW AFFECTED BY FLUID CONTACT, ENERGY FIELD OR COANDA EFFECT (E.G., PURE FLUID DEVICE OR SYSTEM)138/121CorrugatedExaminersPrimary: Cohan, AlanAttorney, Agent or FirmInternational ClassF17D 001/20AbstractA method and apparatus for reducing drag and noise associated with fluid w within a conduit is provided. The conduit has flexible walls that are shaped to form stationary waves having peaks and troughs and are repeated in the axial direction of the conduit. The stationary waves are moved along the axial direction of the conduit whereby a vortex is trapped in the fluid flow at each of the troughs. Each of the vortices forms part of an isolating layer between the conduit wall and the main stream of the fluid flow thereby reducing drag. Furthermore, the vortices push the dominant noise producing region toward the center of the fluid flow where sound coupling efficiency is lower. | |
