When traditional air-to-air cooling is too voluminous, heat exchangers with long thermosyphons offer a good alternative. Experiments with a single thermosyphon with a large length-to-diameter ratio (188) and filled with R-134a are presented and analyzed. Saturation temperatures, filling ratios, and angles of inclination have been varied in wide ranges. A higher sensitivity of evaporation heat transfer coefficients on reduced pressure than in previous work has been found. Measurements revealed the effect of pressure or the saturation temperature on condensation heat transfer. The condensate film Reynolds number that marks a transition from one condensation heat transfer regime to another is found to depend on pressure. This effect was not accounted for by correlations from the literature. New correlations are presented to predict condensation and evaporation heat transfer rates.
Skip Nav Destination
e-mail: c.w.m.v.d.geld@tue.nl
Article navigation
Research Papers
Predicting Heat Transfer in Long R-134a Filled Thermosyphons
M. H. M. Grooten,
M. H. M. Grooten
Department of Mechanical Engineering,
e-mail: c.w.m.v.d.geld@tue.nl
Technische Universiteit Eindhoven
, Postbus 513, 5600 MB Eindhoven, The Netherlands
Search for other works by this author on:
C. W. M. van der Geld
C. W. M. van der Geld
Department of Mechanical Engineering,
Technische Universiteit Eindhoven
, Postbus 513, 5600 MB Eindhoven, The Netherlands
Search for other works by this author on:
M. H. M. Grooten
Department of Mechanical Engineering,
Technische Universiteit Eindhoven
, Postbus 513, 5600 MB Eindhoven, The Netherlandse-mail: c.w.m.v.d.geld@tue.nl
C. W. M. van der Geld
Department of Mechanical Engineering,
Technische Universiteit Eindhoven
, Postbus 513, 5600 MB Eindhoven, The NetherlandsJ. Heat Transfer. May 2009, 131(5): 051501 (9 pages)
Published Online: March 20, 2009
Article history
Received:
March 31, 2008
Revised:
September 16, 2008
Published:
March 20, 2009
Citation
Grooten, M. H. M., and van der Geld, C. W. M. (March 20, 2009). "Predicting Heat Transfer in Long R-134a Filled Thermosyphons." ASME. J. Heat Transfer. May 2009; 131(5): 051501. https://doi.org/10.1115/1.3000969
Download citation file:
Get Email Alerts
Cited By
Surrogate Modeling-Based Analysis of Concentration Decay in Diffusion-Reaction Mass Transfer Problems
J. Heat Mass Transfer (June 2025)
External Conjugate Boiling On Channels. A Graetz Problem With Multiple Solutions
J. Heat Mass Transfer
Related Articles
Temperature Response of Heat Transport in a Micro Heat Pipe
J. Heat Transfer (May,1999)
Numerical Analysis of Heat Transfer Characteristics of a Falling Film Type Plate-Fin Condenser/Reboiler
J. Heat Transfer (August,2016)
Effect of Internal Wick Structure on Liquid-Vapor Oscillatory Flow and Heat Transfer in an Oscillating Heat Pipe
J. Heat Transfer (December,2009)
Comparative Study on Thermal Performance of Ultrathin Miniature Loop Heat Pipes With Different Internal Wicks
J. Heat Transfer (December,2017)
Related Proceedings Papers
Related Chapters
Thermal Design Guide of Liquid Cooled Systems
Thermal Design of Liquid Cooled Microelectronic Equipment
Condensation in Cool Roofs—Code Challenges, Field Observations, and Hygrothermal Modeling
Roofing Research and Standards Development: 10th Volume
Evaluation of Moisture Accumulation in Composite Roof Decks in High Humidity Environments such as Natatoriums in Cold Climates Using Hygrothermal Modeling
Roofing Research and Standards Development: 10th Volume