A signal analysis method used for condensing refrigerants is presented, which resulted in a modification of the prediction method for heat transfer based on probabilistic time-fractional results. An objective visual method for discrimination of flow patterns and determining probabilistic time-fractions in intermittent flow was developed. The frequency domain was identified as the main candidate for discrimination of sub-regimes present in intermittent flow. Experimental work was conducted using refrigerants R-22 and R-134a, at an average saturation temperature of 40°C, with mass fluxes ranging from 200–700 kg/m2s, and with test section inlet vapour qualities ranging from 0.65 down to 0.10. These test conditions mostly represented intermittent flow. The modified correlation predicted the experimental data with a mean absolute deviation of 10%.
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2010 14th International Heat Transfer Conference
August 8–13, 2010
Washington, DC, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4937-8
PROCEEDINGS PAPER
Probabilistic Flow-Pattern-Based Heat Transfer for Condensing Intermittent Flow in Smooth Horizontal Tubes
Josua P. Meyer
,
Josua P. Meyer
University of Pretoria, Pretoria, South Africa
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Marcel Christians
,
Marcel Christians
University of Pretoria, Pretoria, South Africa
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Leon Liebenberg
,
Leon Liebenberg
University of Pretoria, Pretoria, South Africa
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Eugene van Rooyen
Eugene van Rooyen
University of Pretoria, Pretoria, South Africa
Search for other works by this author on:
Josua P. Meyer
University of Pretoria, Pretoria, South Africa
Marcel Christians
University of Pretoria, Pretoria, South Africa
Leon Liebenberg
University of Pretoria, Pretoria, South Africa
Eugene van Rooyen
University of Pretoria, Pretoria, South Africa
Paper No:
IHTC14-22336, pp. 115-124; 10 pages
Published Online:
March 1, 2011
Citation
Meyer, JP, Christians, M, Liebenberg, L, & van Rooyen, E. "Probabilistic Flow-Pattern-Based Heat Transfer for Condensing Intermittent Flow in Smooth Horizontal Tubes." Proceedings of the 2010 14th International Heat Transfer Conference. 2010 14th International Heat Transfer Conference, Volume 2. Washington, DC, USA. August 8–13, 2010. pp. 115-124. ASME. https://doi.org/10.1115/IHTC14-22336
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