Étalonnage basé sur la mesure de masse d'un capteur capacitif pour mesurer la fraction de vide pour le R134a dans des tubes lisses

Translated title of the contribution: Mass measurement based calibration of a capacitive sensor to measure void fraction for R134a in smooth tubes

Hongliang Qian, Pega Hrnjak

Research output: Contribution to journalArticle

Abstract

This paper presents a new capacitive sensor built and used to measure void fraction of both horizontal and vertical upward flow in the low mass flux range in circular tubes with an inner diameter of 7 mm. Three sensors with different axial lengths (D, 2D/3, and D/2) are built and evaluated to examine the possibility of utilizing shorter sensors in applications with space limitations. Results show all three sensors have the capability to measure void fraction. Due to the nonlinear relation between capacitive signals and void fraction, a calibration procedure based on mass measurement (quick-closing valve technique, QCV) is proposed. After the calibration procedure, most void fraction data measured by the sensor falls into the ±15% deviations of the experimental results by QCV for horizontal flow and ±10% for vertical upward flow. Sensors with the same design can be utilized directly to measure void fraction for the similar test conditions in the future studies.

Translated title of the contributionMass measurement based calibration of a capacitive sensor to measure void fraction for R134a in smooth tubes
Original languageFrench
Pages (from-to)168-177
Number of pages10
JournalInternational Journal of Refrigeration
Volume110
DOIs
StatePublished - Feb 2020

Keywords

  • Calibration
  • Capacitive sensor
  • Quick-closing valve
  • Void fraction

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Mass measurement based calibration of a capacitive sensor to measure void fraction for R134a in smooth tubes'. Together they form a unique fingerprint.

  • Cite this