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.
- Sponsored in part by Office of Naval Research, Arlington, Va.
University of Michigan, Ann ArborDepartment of Naval Architects and Marine Engineers
Ann Arbor, MI USA 48109
Office of Naval ResearchDepartment of the Navy, 800 North Quincy Street
Arlington, VA USA 22217
- Fitzgerald, P D
- Publication Date: 1974
- Pagination: 84 p.
- TRT Terms: Additives; Drag; Laser doppler velocimeters; Polymers
- Old TRIS Terms: Drag reduction; Polymer additives; Polymer degradation
- Subject Areas: Design; Marine Transportation;
- 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