Flow visualization of time-varying structural characteristics of Dean vortices in a curved channel
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Authors
Bella, David Wayne
Subjects
Visualization
Dean vortices
Centrifugal instabilities
Rocking motion
Dean vortices
Centrifugal instabilities
Rocking motion
Advisors
Ligrani, Phillip M.
Subramanian, Chelakara S.
Date of Issue
1988-12
Date
December 1988
Publisher
Language
en_US
Abstract
The time varying development and structure of Dean vortices were studies using flow visualization. Observations were made over a range of Dean numbers from 40 to 200 using a transparent channel with mild curvature, 40:1 aspect ratio, and an inner to outer radius ratio of 0.979. Seven flow visualization techniques were tried but only one, a wood burning smoke generator, produced usable results. Different vortex characteristics were observed and documented in sequences of photographs space one quarter of a second apart at locations ranging from 85 to 135 degrees from the start of curvature. Evidence is presented that supports the twisting/rocking nature of the flow.
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
99 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.