Hot film sensors in unsteady air flow - analysis and experiment

K. D. Cole, P. W. Liang

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations


Hot-film sensors have been extensively used to determine the shear stress based on the heat transfer in the flow above the sensor. However, in unsteady flow a distortion in the shear stress signal is caused by the storage of heat in the sensor substrate. In this paper the heat transfer in the sensor is studied with a three-dimensional, transient conjugate heat transfer problem. The hot-film sensor is investigated numerically for the phase lag and the amplitude response in flow with an oscillating component. Experimental measurements on the frequency response behavior of a commercially available hot-film sensor in unsteady flow compare favorably with the numerical simulation results. With a data-analysis scheme based on an inverse method, the undistorted shear stress in unsteady flow is also recovered successfully from the hot-film measurements.

Original languageEnglish (US)
Pages (from-to)1-10
Number of pages10
JournalAmerican Society of Mechanical Engineers (Paper)
StatePublished - 1993
EventProceedings of the ASME Winter Conference - New Orleans, LA, USA
Duration: Nov 28 1993Dec 3 1993

ASJC Scopus subject areas

  • Mechanical Engineering


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