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Characterization of R134a two-phase flow regimes in horizontal and vertical smooth tubes with capacitive sensors.

Author(s) : QIAN H., HRNJAK P.

Type of article: IJR article

Summary

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.

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Pages: 14

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Details

  • Original title: Characterization of R134a two-phase flow regimes in horizontal and vertical smooth tubes with capacitive sensors.
  • Record ID : 30028273
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 125
  • Publication date: 2021/05
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2021.01.015
  • Document available for consultation in the library of the IIR headquarters only.

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