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 dh = 2.5, 2.0, 1.2, and 0.5 mm. Images of the two-phase flow structures...

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Bibliographic Details
Published inMaterials Vol. 14; no. 22; p. 6889
Main Author Sikora, Małgorzata
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 15.11.2021
MDPI
Subjects
Algorithms
Diameters
Flow mapping
Flow visualization
Heat transfer
Hydraulics
Image analysis
Refrigerants
Stereology
Two phase flow
Visualization
Void fraction
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ISSN1996-1944
1996-1944
DOI10.3390/ma14226889

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Summary: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 dh = 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/m2s) and saturation temperatures (ts = 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.
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ISSN:1996-1944
1996-1944
DOI:10.3390/ma14226889