Signal analysis and mass measurement based calibration of capacitive sensors for void fraction and flow regimes in horizontal and vertical round tubes using R134a

Hongliang Qian, Pega Hrnjak

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Flow patterns and void fraction are crucial descriptors of two-phase flows. This paper presents flow pattern identification and void fraction measurement with a non-intrusive method by a new capacitive sensor. In addition, this paper presents characterization of flow patterns with the capacitive sensor, correlated to visualization results obtained by a high-speed camera in horizontal and vertical round tubes (D=7mm) with R134a in developed adiabatic conditions. The sensor can characterize flow patterns observed within the test conditions. The sensor was calibrated based on mass measurements. After this calibration, the capacitive sensor can be directly used to measure void fraction in further studies. Three different axial lengths of electrodes in the sensor are built to explore the potential of application of this sensor in various HVAC&R systems. The comparison of signals from each of them shows that the signals are independent of axial length in the range explored.

Original languageEnglish (US)
Title of host publicationICR 2019 - 25th IIR International Congress of Refrigeration
EditorsVasile Minea
PublisherInternational Institute of Refrigeration
Pages1207-1214
Number of pages8
ISBN (Electronic)9782362150357
DOIs
StatePublished - 2019
Event25th IIR International Congress of Refrigeration, ICR 2019 - Montreal, Canada
Duration: Aug 24 2019Aug 30 2019

Publication series

NameRefrigeration Science and Technology
Volume2019-August
ISSN (Print)0151-1637

Conference

Conference25th IIR International Congress of Refrigeration, ICR 2019
Country/TerritoryCanada
CityMontreal
Period8/24/198/30/19

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Condensed Matter Physics

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