Thermosyphon reboilers are widely used in refineries, petrochemical industries and other chemical processes. The liquid product stream coming from the bottom of the vapor-liquid separator is heated in an evaporator consisting of a vertical tube or tube bundle. When the evaporation occurs, the specific volume of the two-phase fluid increases. The upward buoyancy force caused by the density difference between the evaporator and down-flow pipe drives the fluid flowing through the evaporator in to the separator and forms a natural circulation. The experiments were conducted in a pilot scale thermosyphon system in which the evaporator consists of 7 steel tubes (outside diameter 30 mm, wall thickness 2 mm, length 4 m). A mathematical model was set up to simulate the heat transfer and pressure drop, in which empirical equations from literature were used. With the help of the simulation, the flow boiling heat transfer coefficients inside the tubes can be evaluated from a few measured local wall temperatures.
Skip Nav Destination
2010 14th International Heat Transfer Conference
August 8–13, 2010
Washington, DC, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4939-2
PROCEEDINGS PAPER
Experimental Investigation on Natural Circulation in a Thermosyphon Reboiler
Xing Luo,
Xing Luo
Helmut Schmidt University, Hamburg, Germany; University of Shanghai for Science and Technology, Shanghai, China
Search for other works by this author on:
Yanming Gao,
Yanming Gao
University of Shanghai for Science and Technology, Shanghai, China
Search for other works by this author on:
Stephan Kabelac
Stephan Kabelac
Helmut Schmidt University, Hamburg, Germany
Search for other works by this author on:
Xing Luo
Helmut Schmidt University, Hamburg, Germany; University of Shanghai for Science and Technology, Shanghai, China
Yanming Gao
University of Shanghai for Science and Technology, Shanghai, China
Stephan Kabelac
Helmut Schmidt University, Hamburg, Germany
Paper No:
IHTC14-22618, pp. 539-544; 6 pages
Published Online:
March 1, 2011
Citation
Luo, X, Gao, Y, & Kabelac, S. "Experimental Investigation on Natural Circulation in a Thermosyphon Reboiler." Proceedings of the 2010 14th International Heat Transfer Conference. 2010 14th International Heat Transfer Conference, Volume 4. Washington, DC, USA. August 8–13, 2010. pp. 539-544. ASME. https://doi.org/10.1115/IHTC14-22618
Download citation file:
13
Views
Related Proceedings Papers
Related Articles
Evaporation Heat Transfer and Pressure Drop of Refrigerant R-410A Flow in a Vertical Plate Heat Exchanger
J. Heat Transfer (October,2003)
Heat Transfer Coefficient, Pressure Gradient, and Flow Patterns of R1234yf Evaporating in Microchannel Tube
J. Heat Transfer (April,2021)
Convective Boiling of R-134a Near the Micro-Macroscale Transition Inside a Vertical Brazed Plate Heat Exchanger
J. Heat Transfer (September,2018)
Related Chapters
Extended-Surface Metallurgy
Heat Exchanger Engineering Techniques
Lessons Learned: NRC Experience
Continuing and Changing Priorities of the ASME Boiler & Pressure Vessel Codes and Standards
Introduction
Pipe Stress Engineering