Flow Structure Investigations during Novec Refrigerant Condensation in Minichannels
This article presents the results of flow visualization studies of Novec refrigerants during condensation in minichannels. Experimental investigation of two-phase flow regimes was conducted in minichannels with internal diameter <i>d<sub>h</sub></i> = 2.5, 2.0, 1.2, and 0.5 m...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-11-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/14/22/6889 |
| _version_ | 1797509562878656512 |
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| author | Małgorzata Sikora |
| author_facet | Małgorzata Sikora |
| author_sort | Małgorzata Sikora |
| collection | DOAJ |
| description | This article presents the results of flow visualization studies of Novec refrigerants during condensation in minichannels. Experimental investigation of two-phase flow regimes was conducted in minichannels with internal diameter <i>d<sub>h</sub></i> = 2.5, 2.0, 1.2, and 0.5 mm. Images of the two-phase flow structures were analyzed by using the MATLAB algorithm. To calculate void fraction, a two-dimensional areal quantitative stereology technique was used. Observation of flow structures formed during the process of condensation was the major aim of the investigations. The condensation studies were conducted over a wide range of mass flux densities (G = 80–5500 kg/m<sup>2</sup>s) and saturation temperatures (<i>t<sub>s</sub></i> = 30–70 °C). Visualization results and image analysis methods are described in this paper. Based on the experimental results, a flow structure map was constructed and presented. |
| first_indexed | 2024-03-10T05:19:33Z |
| format | Article |
| id | doaj.art-3648b79a441645789189a08ad62ee9ba |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T05:19:33Z |
| publishDate | 2021-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-3648b79a441645789189a08ad62ee9ba2023-11-23T00:10:20ZengMDPI AGMaterials1996-19442021-11-011422688910.3390/ma14226889Flow Structure Investigations during Novec Refrigerant Condensation in MinichannelsMałgorzata Sikora0Department of Energy, Koszalin University of Technology, ul. Racławicka 15-17, 75-620 Koszalin, PolandThis article presents the results of flow visualization studies of Novec refrigerants during condensation in minichannels. Experimental investigation of two-phase flow regimes was conducted in minichannels with internal diameter <i>d<sub>h</sub></i> = 2.5, 2.0, 1.2, and 0.5 mm. Images of the two-phase flow structures were analyzed by using the MATLAB algorithm. To calculate void fraction, a two-dimensional areal quantitative stereology technique was used. Observation of flow structures formed during the process of condensation was the major aim of the investigations. The condensation studies were conducted over a wide range of mass flux densities (G = 80–5500 kg/m<sup>2</sup>s) and saturation temperatures (<i>t<sub>s</sub></i> = 30–70 °C). Visualization results and image analysis methods are described in this paper. Based on the experimental results, a flow structure map was constructed and presented.https://www.mdpi.com/1996-1944/14/22/6889flow structurescondensationminichannelsflow mapsimage analysis |
| spellingShingle | Małgorzata Sikora Flow Structure Investigations during Novec Refrigerant Condensation in Minichannels Materials flow structures condensation minichannels flow maps image analysis |
| title | Flow Structure Investigations during Novec Refrigerant Condensation in Minichannels |
| title_full | Flow Structure Investigations during Novec Refrigerant Condensation in Minichannels |
| title_fullStr | Flow Structure Investigations during Novec Refrigerant Condensation in Minichannels |
| title_full_unstemmed | Flow Structure Investigations during Novec Refrigerant Condensation in Minichannels |
| title_short | Flow Structure Investigations during Novec Refrigerant Condensation in Minichannels |
| title_sort | flow structure investigations during novec refrigerant condensation in minichannels |
| topic | flow structures condensation minichannels flow maps image analysis |
| url | https://www.mdpi.com/1996-1944/14/22/6889 |
| work_keys_str_mv | AT małgorzatasikora flowstructureinvestigationsduringnovecrefrigerantcondensationinminichannels |