Simultaneous measurements of flow-induced noise and two-phase flow regime in expansion valves

Yingyue Zhang, Stefan Elbel

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


Flow-induced noise generated by the expansion devices is disturbing to the user because of its high-frequency properties. In the paper, a pumped R134a loop and the simultaneous measurements including the accelerometer, the microphone, the high-speed pressure transducer, and the high-speed camera are utilized. Thus, the flow-induced noise can be related to specific flow movements recorded by the camera. The observed frequency range of the gurgling noise is between 7.5 kHz to 10 kHz, whereas that for the hissing noise is above 10 kHz. The gurgling noise is generated by the flow oscillating movement whereas the hissing noise is caused by the flow-structure interaction. The hissing noise can be enhanced by the structural modes and exists in all kinds of flow regimes. The gurgling noise only exists when TXV inlet has two-phase flow. The acceleration signal matches the microphone signal and the accelerometer can be used to simulate the flow-induced noise.

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

Publication series

NameRefrigeration Science and Technology
ISSN (Print)0151-1637


Conference25th IIR International Congress of Refrigeration, ICR 2019


  • Flow regimes
  • Flow visualization
  • Flow-induced noise
  • Gurgling noise
  • Hissing noise

ASJC Scopus subject areas

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


Dive into the research topics of 'Simultaneous measurements of flow-induced noise and two-phase flow regime in expansion valves'. Together they form a unique fingerprint.

Cite this