Experimental study on the void fraction during two-phase flow of R1234yf in smooth horizontal tubes

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2019-08-01
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Mcode
Degree programme
Language
en
Pages
Series
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
Abstract
Void fraction is an important parameter to design and simulate thermal systems involving two-phase flows. In this research, an experimental investigation of the void fraction in adiabatic two-phase flow of R1234yf in horizontal and smooth tubes with an internal diameter of 4.8 mm was carried out. For the experimental tests, the vapor quality ranges from 0.1 to 1 while two saturation temperatures (15 and 25°C) and two mass flow rates (180 and 280 kg.m-2s-1) are investigated. The quick-closing valve(s) method is used to measure the volumetric void fraction. Tests are also undertaken with R134a used as a reference in this study. The results highlight that the void fraction of R1234yf is 5% lower than that for R134a. In addition, the experimental data of R1234yf were compared against seven correlations from the literature: the Baroczy and the Hughmark correlations were shown to provide the best prediction, with a mean absolute error of 2% and 3.2%, respectively.
Description
Keywords
Void fraction, Quick-closing valve(s) method, R1234yf, R134a, Two-phase flow, Smooth horizontal tubes
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Citation
Garcia Pabon , J J , Pereira , L C , Humia , G , Khosravi , A , Revellin , R , Bonjour , J & Machado , L 2019 , ' Experimental study on the void fraction during two-phase flow of R1234yf in smooth horizontal tubes ' , INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID , vol. 104 , pp. 103-112 . https://doi.org/10.1016/j.ijrefrig.2019.05.007