Caractérisation des régimes d’écoulement diphasique du R134a dans des tubes lisses horizontaux et verticaux à l'aide de capteurs capacitifs

Translated title of the contribution: Characterization of R134a two-phase flow regimes in horizontal and vertical smooth tubes with capacitive sensors

Hongliang Qian, Pega Hrnjak

Research output: Contribution to journalArticlepeer-review

Abstract

This paper presents the identification of slug/stratified-wavy, stratified-wavy and annular regimes for horizontal flow (in the range of mass fluxes 40 – 150 kg m−2 s−1), and slug, churn, and annular flow regimes for vertical upward flow (in the range 65 – 115 kg m−2 s−1) for R134a flow through 7 mm ID tube. Flow regimes are characterized based on time plot of normalized capacitive signals, kernel density estimation (KDE), power spectral density (PSD), and visualization results from a high-speed camera. Sensors with different axial lengths (D, 2D/3, and D/2) are also tested to study the adequacy of shorter sensors for the characterization of flow regimes. Results show that all three sensors have a similar capability of characterizing flow regimes, justifying the use of the shorter sensors in many applications with limited space.

Translated title of the contributionCharacterization of R134a two-phase flow regimes in horizontal and vertical smooth tubes with capacitive sensors
Original languageFrench
Pages (from-to)90-103
Number of pages14
JournalInternational Journal of Refrigeration
Volume125
DOIs
StatePublished - May 2021

Keywords

  • Capacitive sensor
  • Flow regime
  • Horizontal and vertical flow
  • Two-phase flow
  • Void fraction

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering

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