Development qualification and measurements in two curved channels with 40 to 1 aspect ratio.
Hughes, Randy E.
Ligrani, Phillip M.
Subramanian, Chelakara S.
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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.
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