Condensation heat transfer and flow characteristics of R-134a flowing through corrugated tubes
作者： Suriyan Laohalertdecha , Somchai Wongwises
DOI: 10.1016/J.IJHEATMASSTRANSFER.2010.12.034
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摘要: Abstract This article presents the condensation heat transfer and flow characteristics of R-134a flowing through corrugated tubes experimentally. The test section is a horizontal counter-flow concentric tube-in-tube exchanger 2000 mm in length. A smooth copper tube having inner diameters 8.7 mm are used as an tube. outer made from diameter 21.2 mm. corrugation pitches this study 5.08, 6.35, 8.46 mm. Similarly, depths 1, 1.25, 1.5 mm, respectively. conditions performed at saturation temperatures 40–50 °C, fluxes 5–10 kW/m 2 , mass 200–700 kg/m s, equivalent Reynolds numbers 30000–120000. Nusselt number two-phase friction factor obtained significantly higher than those Finally, new correlations developed based on present experimental data for predicting tubes.
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