The local distributions of void fraction, interfacial frequency, and velocity have been measured in annular flow of R-134a through a wall-heated, high aspect ratio duct. High aspect ratio ducts provide superior optical access to tubes or irregular geometries. This work expands upon earlier experiments conducted with adiabatic flows in the same test section. Use of thin, transparent heater films on quartz windows provided sufficient electrical power capacity to produce the full range of two-phase conditions of interest. With wall vapor generation, the system pressure was varied from 0.9 to 2.4 MPa, thus allowing the investigation of flows with liquid-to-vapor density ratios covering the range of about 7 to 27, far less than studied in air-water and similar systems. There is evidence that for a given cross-sectional average void fraction, the local phase distributions can be different depending on whether the vapor phase is generated at the wall, or upstream of the test section inlet. In wall-heated flows, local void fraction profiles measured across both the wide and narrow test section dimensions illustrate the profound effect that pressure has on the local flow structure; notably, increasing pressure appears to thin the wall-bounded liquid films and redistribute liquid toward the edges of the test section. This general trend is also manifested in the distributions of mean droplet diameter and interfacial area density, which are inferred from local measurements of void fraction, droplet frequency and velocity. At high pressure, the interfacial area density is increased due to the significant enhancement in droplet concentration.
Skip Nav Destination
Article navigation
January 2003
Technical Papers
Effect of Pressure With Wall Heating in Annular Two-Phase Flow
Ranganathan Kumar,
Ranganathan Kumar
Lockheed Martin, Inc., One River Road, Bin 109, Schenectady, NY 12301
Search for other works by this author on:
Thomas A. Trabold
Thomas A. Trabold
General Motors, Ten Carriage Street, Honeoye Falls, NY
Search for other works by this author on:
Ranganathan Kumar
Lockheed Martin, Inc., One River Road, Bin 109, Schenectady, NY 12301
Thomas A. Trabold
General Motors, Ten Carriage Street, Honeoye Falls, NY
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division Nov. 4, 2000; revised manuscript received Aug. 9, 2002. Associate Editor: J. Katz.
J. Fluids Eng. Jan 2003, 125(1): 84-96 (13 pages)
Published Online: January 22, 2003
Article history
Received:
November 4, 2000
Revised:
August 9, 2002
Online:
January 22, 2003
Citation
Kumar, R., and Trabold, T. A. (January 22, 2003). "Effect of Pressure With Wall Heating in Annular Two-Phase Flow ." ASME. J. Fluids Eng. January 2003; 125(1): 84–96. https://doi.org/10.1115/1.1524583
Download citation file:
Get Email Alerts
Cited By
Entrance Lengths for Fully Developed Laminar Flow in Eccentric Annulus
J. Fluids Eng (May 2025)
Switching Events of Wakes Shed From Two Short Flapping Side-by-Side Cylinders
J. Fluids Eng (May 2025)
Related Articles
High Pressure Annular Two-Phase Flow in a Narrow Duct: Part I—Local Measurements in the Droplet Field
J. Fluids Eng (June,2000)
Droplet Entrainment From a Shear-Driven Liquid Wall Film in Inclined Ducts: Experimental Study and Correlation Comparison
J. Eng. Gas Turbines Power (October,2002)
Simultaneous Investigation of Entrained Liquid Fraction, Liquid Film Thickness and Pressure Drop in Vertical Annular Flow
J. Energy Resour. Technol (June,2011)
Flow Visualization and Local Measurement of Forced Convection Heat Transfer in a Microtube
J. Heat Transfer (March,2010)
Related Proceedings Papers
Related Chapters
Scope of Section I, Organization, and Service Limits
Power Boilers: A Guide to the Section I of the ASME Boiler and Pressure Vessel Code, Second Edition
Pool Boiling
Thermal Management of Microelectronic Equipment, Second Edition
Thermal Design Guide of Liquid Cooled Systems
Thermal Design of Liquid Cooled Microelectronic Equipment