Hot-film anemometer measurements in adiabatic two-phase flow through a vertical duct
- Lockheed Martin Corp., Schenectady, NY (United States)
A hot-film anemometer (HFA) probe was used to obtain local measurements of void fraction and bubble frequency in a vertically oriented, high aspect ratio duct containing R-134a under selected adiabatic two-phase flow conditions. Data were obtained along a narrow dimension scan over the range 0.03 {le} {bar Z} {le} 0.80, where {bar Z} is the distance from the wall normalized with the duct spacing dimension. The void fraction profiles displayed large gradients in the near-wall regions and broad maxima near the duct centerline. The trends in the bubble frequency data generally follow those for the local void fraction data. However, the relatively large number of bubbles at higher pressure implies a larger magnitude of the interfacial area concentration, for the same cross-sectional average void fraction. For the two annular flow conditions tested, analysis of the HFA output voltage signal enabled identification of three distinct regions of the flow field; liquid film with dispersed bubbles, interfacial waves, and continuous vapor with dispersed droplets.
- Research Organization:
- Knolls Atomic Power Lab. (KAPL), Niskayuna, NY (United States)
- Sponsoring Organization:
- USDOE Assistant Secretary for Nuclear Energy, Washington, DC (United States)
- DOE Contract Number:
- AC12-76SN00052
- OSTI ID:
- 350943
- Report Number(s):
- KAPL-P-000233; K-96137; CONF-970670-; ON: DE99002691; TRN: AHC29921%%129
- Resource Relation:
- Conference: American Society of Mechanical Engineers (ASME) fluids engineering division summer meeting, Vancouver (Canada), 22-26 Jun 1997; Other Information: PBD: Jun 1997
- Country of Publication:
- United States
- Language:
- English
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