An experimental study of two-phase heat transfer coefficients was carried out using R134a in uniformly heated horizontal circular microtubes with diameters of 0.50 mm and 1.60 mm. The effects of mass flux, heat flux, saturation pressure, and vapor quality on heat transfer coefficients were studied. The flow parameters investigated were as follows: exit pressures of 490, 670, 890, and 1160 kPa; mass fluxes of 300–1500 kg/m2s; heat fluxes of 0–350 kW/m2; inlet subcooling of 5, 20, and 40 °C; and exit qualities of 0 to 1.0. The parametric trends presented in the study are consistent with published literature. Heat transfer coefficients increased with increasing heat flux and saturation pressure while they were independent of variations in mass flux. Vapor quality had a negligible influence on heat transfer coefficients. For the conditions studied, the trends indicated that the dominant heat transfer mechanism was nucleate boiling. The experimental data was compared to three microchannel correlations — the Lazarek-Black, the Kandlikar, and the Tran Correlations. None of the correlations predicted the experimental data very well, although they all predicted the correct trend within limits of experimental error.
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2010 14th International Heat Transfer Conference
August 8–13, 2010
Washington, DC, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4936-1
PROCEEDINGS PAPER
Heat Transfer Characteristics of Flow Boiling of R134a in Uniformly Heated Horizontal Circular Microtubes
Saptarshi Basu,
Saptarshi Basu
Rensselaer Polytechnic Institute, Troy, NY
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Sidy Ndao,
Sidy Ndao
Rensselaer Polytechnic Institute, Troy, NY
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Gregory J. Michna,
Gregory J. Michna
South Dakota State University, Brookings, SD
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Yoav Peles,
Yoav Peles
Rensselaer Polytechnic Institute, Troy, NY
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Michael K. Jensen
Michael K. Jensen
Rensselaer Polytechnic Institute, Troy, NY
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Saptarshi Basu
Rensselaer Polytechnic Institute, Troy, NY
Sidy Ndao
Rensselaer Polytechnic Institute, Troy, NY
Gregory J. Michna
South Dakota State University, Brookings, SD
Yoav Peles
Rensselaer Polytechnic Institute, Troy, NY
Michael K. Jensen
Rensselaer Polytechnic Institute, Troy, NY
Paper No:
IHTC14-22656, pp. 385-396; 12 pages
Published Online:
March 1, 2011
Citation
Basu, S, Ndao, S, Michna, GJ, Peles, Y, & Jensen, MK. "Heat Transfer Characteristics of Flow Boiling of R134a in Uniformly Heated Horizontal Circular Microtubes." Proceedings of the 2010 14th International Heat Transfer Conference. 2010 14th International Heat Transfer Conference, Volume 1. Washington, DC, USA. August 8–13, 2010. pp. 385-396. ASME. https://doi.org/10.1115/IHTC14-22656
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