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Title: R134a flow patterns in small diameter tubes
Authors: Chen, L
Tian, YS
Karayiannis, TG
Keywords: Two-phase flow
flow patterns
small diameter
vertical flow
Publication Date: 2004
Publisher: Edizioni ETS
Citation: 3rd International Symposium on Two-Phase flow Modelling and Experimentation. Pisa, 22-24 September 2004
Abstract: R134a vapour-liquid two-phase flow patterns were studied in vertical small diameter tubes. The observed flow patterns include bubbly, dispersed bubble, slug, churn, annular and mist flow. Six integrated flow pattern maps, derived for two internal diameters (2.01 and 4.26 mm) and three different pressures (6.0, 10.0, 14.0 bar), are presented. Some transition boundaries, such as slug-churn and churn-annular, were found to be very sensitive to diameter and pressure. On the contrary, the boundaries of dispersed bubble-churn and bubbly-slug are less affected. The transition boundaries are compared with the existing models for normal size tubes showing significant differences.
Appears in Collections:School of Engineering and Design Research papers
Mechanical and Aerospace Engineering

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