Actions for Visualization of Secondary Flow Development in High Aspect Ratio Channels with Curvature

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Visualization of Secondary Flow Development in High Aspect Ratio Channels with Curvature

Author
Giuliani, James E.
Published
Jun 1, 1994.
Physical Description
1 electronic document
Additional Creators
Meyer, Michael L.
Online Version

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Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access
Summary
The results of an experimental project to visually examine the secondary flow structure that develops in curved, high aspect-ratio rectangular channels are presented. The results provide insight into the fluid dynamics within high aspect ratio channels. A water flow test rig constructed out of plexiglass, with an adjustable aspect ratio, was used for these experiments. Results were obtained for a channel geometry with a hydraulic diameter of 10.6 mm (0.417 in.), an aspect ratio of 5.0, and a hydraulic radius to curvature radius ratio of 0.0417. Flow conditions were varied to achieve Reynolds numbers up to 5,100. A new particle imaging velocimetry technique was developed which could resolve velocity information from particles entering and leaving the field of view. Time averaged secondary flow velocity vectors, obtained using this velocimetry technique, are presented for 30 degrees, 60 degrees, and 90 degrees into a 180 degrees bend and at a Reynolds number of 5,100. The secondary flow results suggest the coexistence of both the classical curvature induced vortex pair flow structure and the eddies seen in straight turbulent channel flow.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19940029435.
Accession ID: 94N33941.
NAS 1.15:106658.
NASA-TM-106658.
E-8972.
AIAA PAPER 94-2979.
Joint Propulsion Conference; 27-29 Jun. 1994; Indianapolis, IN; United States.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15423477