Abstract
The void fraction measurement technique used in this work is based on measuring the capacity between two electrodes. The electrodes are curved so they closely fit to the tube wall; due to this the measured capacitance is influenced by the spatial distribution of the phases and not only the void fraction. Hence, the measured capacitance does not linearly vary with the void fraction. In this work a method is proposed to account for the distribution of the phases and thus determine the void fraction based on capacitive measurements. The proposed method was applied to 270 measurement points. The tube diameter D is 8 mm, the mass flux ranges from 200 to 500 kg m−2s−1 and the vapour fraction ranges between 2.5% and 97.5%. Refrigerants R134a and R410A were used. The results were compared to the Steiner version of the Rouhani–Axelsson drift flux void fraction model. A very good agreement with this model was observed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
