Tunable AC thermal anemometry

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

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)


This paper suggests and demonstrates a novel flow measurement technique: tunable AC thermal anemometry, that allows simple integration, robust measurement and extremely high accuracy. The principle and simple theoretical analysis of the technique are presented. To find the optimal condition at which the phase lag becomes most sensitive to the flow speed change, the phase lag was measured scanning the heating frequency from 1 to 100 Hz, while the flow speed of ethanol was increased stepwise from 0 to 40 mm/s. The sensitivity of the phase lag depended on the heating frequency and the flow speed. It was possible to measure the average flow speed of 0.7 mm/s with the resolution of 0.1 mm/s at 4 Hz.

Original languageEnglish
Pages (from-to)325-338
Number of pages14
JournalSuperlattices and Microstructures
Issue number3-6
Publication statusPublished - 2004 Mar
EventEurotherm 75: Microscale Heat Transfer 2 - Reims, France
Duration: 2003 Jul 82003 Jul 10

Bibliographical note

Funding Information:
The authors gratefully acknowledge the support from the Korea Institute of Machinery and Materials.


  • Alternating current
  • Hot-wire
  • Phase lag
  • Thermal anemometry

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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