Implementation of a new thermal model and static calibration of a wedge-shaped hot-film probe in a constant-temperature mode

M. Krause, U. Gaisbauer, E. Kraemer, A. D. Kosinov

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Wedge-shaped hot-films are a promising alternative to hot-wires for supersonic free flow disturbance measurements if hot-wires cannot be used due to harsh flow conditions. Up to the present, wedge hot-films could not serve as quantitative tools because of an insufficient modelling of the substrate's influence on the thermal balance. The present paper shows a static calibration of a wedge-shaped hot-film sensor that is based on a combination of an analytical, a numerical and an experimental approach. The substrate's impact was analysed by the help of CFD simulations and modelled by a newly introduced substrate factor. The obtained sensitivities were discussed and qualitatively explained compared with standard hot-wires. A quantitative comparison of experimentally detected mass flux fluctuations proved the wedge hot-film data to match similar hot-wire results very well. The presented approach has the potential to upgrade hot-films of various shapes to tools for quantitative fluctuation measurements.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalInternational Journal of Heat and Mass Transfer
Volume126
DOIs
Publication statusPublished - Nov 2018
Externally publishedYes

Keywords

  • CFD
  • Heat transfer
  • Static calibration
  • Wedge hot-film
  • SUPERSONIC FLOWS
  • ANEMOMETER
  • HEAT-TRANSFER
  • WIRE

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