Local flow speed measurement using tunable AC thermal anemometry

Won Seok Chung, Ohmyoung Kwon, Joon Sik Lee, Young Ki Choi, Seungho Park

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


This paper shows the results of local flow speed measurement using tunable AC thermal anemometry, which is suitable for the accurate measurement of wide range flow speed. The measurement accuracy is verified through the comparison between the measurement data and the analytic solution of the sensor temperature oscillation in stationary fluid. The relation between the phase lag and the flow speed is experimentally investigated at various conditions. The measurement sensitivity for low flow speed improves in a low frequency region and that for high flow speed improves in a high frequency region. Also, the sensitivity increases with decreasing thermal conductivity of the surrounding fluid. The local flow speed could be measured as low as 1.5mm/s and the highest measurement resolution was 0.05 mm/s in the range of 4.5~ 5.0 mm/s at 1 Hz in this experiment.

Original languageEnglish
Pages (from-to)1449-1459
Number of pages11
JournalJournal of Mechanical Science and Technology
Issue number7
Publication statusPublished - 2005 Jul


  • 3ω Voltage
  • Flow Speed Measurement
  • Phase Lag
  • Steady Periodic Heat Transfer

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering


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