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.
| Original language | English |
|---|---|
| Pages (from-to) | 103-112 |
| Number of pages | 10 |
| Journal | International Journal of Refrigeration - Revue Internationale du Froid |
| Volume | 104 |
| Early online date | 10 May 2019 |
| DOIs | |
| Publication status | Published - 1 Aug 2019 |
| MoE publication type | A1 Journal article-refereed |
Keywords
- Void fraction
- Quick-closing valve(s) method
- R1234yf
- R134a
- Two-phase flow
- Smooth horizontal tubes
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