Publication:
Development qualification and measurements in two curved channels with 40 to 1 aspect ratio.

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Authors
Hughes, Randy E.
Subjects
dean vortex
curved channel
heat transfer channel
Advisors
Ligrani, Phillip M.
Date of Issue
1989-09
Date
September 1989
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
Studies were conducted in two channels with identical internal dimensions. Each channel has mild curvature, 40 to 1 aspect ratio, and a 1.27 cm by 50.08 cm rectangular cross section. One channel is used for flow visualization, and one channel is used for heat transfer measurements. As part of the study, assembly of the heat transfer channel was completed along with qualification tests of internal flow behavior. In the transparent channel, videos and still photographs were taken of visualized flow for Dean numbers from 60 to 200 and angular positions from 85 degrees to 175 degrees from the start of curvature. These data provide new information on the unsteady behavior of Dean vortex pairs, especially how vortex pairs merge and divide. Assembly of the heat transfer channel included installation of insulation to minimize conductive heat losses, completion of wiring of thermocouples used for surface temperature measurements, wiring of heater power supplies and controlling systems, and assembly of piping from the blower to the channel including installation of regulation valves and flow metering orifices. Velocity and pressure surveys were conducted downstream of the instrumented section. For Dean numbers from 50 to 158, these distributions were either spanwise uniform or spanwise periodic, as expected, providing qualification of internal behavior in the channel.
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Other Units
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Propulsion Directorate, MIPR C-800019-F
Funder
Propulsion Directorate, MIPR C-800019-F
Format
72 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.
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