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Flow Boiling of R-134a in Minichannels With Transverse Ribs

[+] Author Affiliations
Majid Molki, Pranay Mahendra, Venugopal Vengala

Southern Illinois University at Edwardsville, Edwardsville, IL

Paper No. ICMM2003-1074, pp. 595-602; 8 pages
  • ASME 2003 1st International Conference on Microchannels and Minichannels
  • 1st International Conference on Microchannels and Minichannels
  • Rochester, New York, USA, April 24–25, 2003
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-3667-3
  • Copyright © 2003 by ASME


An experimental effort was undertaken to investigate the flow boiling of R-134a in minichannels with transverse ribs. The test channel consisted of two parallel plates; the lower plate was heated while the upper plate was adiabatic and fabricated from a clear material to facilitate the visualization and photography of the boiling process. A number of transverse ribs were deployed along the lower plate to form a meandering flow passage inside the minichannel. The ribs blocked 3/4 of the flow cross-section in the transverse direction and the hydraulic diameter of the channel was 1.93 mm. In these experiments, the range of test parameters were: mass flux 100 to 225 kg/m2 s, saturation temperature 15 to 30°C, heat flux 14 kW/m2 , and average vapor quality 0.12 to 0.86. With these parameters, the Convective and Boiling numbers ranged from 0.04 to 0.90 and 7.49 × 10−4 to 8.98 × 10−4 , respectively. Of a total of 60 data points recorded, 78% of the data fell in the convective boiling region, while the remaining 22% were in the nucleate boiling region. In an attempt to model and correlate the data, it was found that the Kandlikar’s correlation proposed for augmented tubes was a suitable model for the present minichannel. Using the least-squares procedure, this two-equation model was fit to a total of 60 experimental data, resulting in a correlation that predicted 58 data points to within ±10%.

Copyright © 2003 by ASME



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