LASER DOPPLER VELOCIMETER EVALUATION AND MEASUREMENTS IN A FLOW WITH DRAG REDUCTION

Drag reduction, effects of polymer degradation and mean flow characteristics of a series of drag reducing polymer flows using tap water as the solvent were obtained using a laser Doppler velocimeter and a pressure transducer. A closed-loop flow system, using a centrifugal pump for recirculation of the flow, allowed a study of the degradation of the 10, 20, 40, 50 and 100 ppm concentrations of Separan AP-30 polymer injected into the flow. Results indicate a significant degradation for all concentrations after just one pass through the flow system. For subsequent passes through the system the non-linear degradation of the polymer flow is observed asymptotically approaching the wall shear stress value of water. Velocity profiles at maximum drag reduction for 10, 20 and 40 ppm concentrations were obtained. An analysis of the optical system used was presented. A complete description of the signal processing system was given.

• Supplemental Notes:
  • Sponsored in part by Office of Naval Research, Arlington, Va.
• Corporate Authors:

  University of Michigan, Ann Arbor

  Department of Naval Architects and Marine Engineers
  Ann Arbor, MI  United States  48109

  Office of Naval Research

  Department of the Navy, 800 North Quincy Street
  Arlington, VA  United States  22217
• Authors:
  • Fitzgerald, P D
• Publication Date: 1974

Media Info

• Pagination: 84 p.

Subject/Index Terms

• TRT Terms: Additives; Drag; Laser doppler velocimeters; Polymers
• Old TRIS Terms: Drag reduction; Polymer additives; Polymer degradation
• Subject Areas: Design; Marine Transportation;

Filing Info

• Accession Number: 00072428
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: PhD Thesis
• Files: TRIS
• Created Date: Nov 27 1974 12:00AM