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Article
Dynamic behaviour of hot-wire probes in turbulent boundary layers.
| Authors: |
Österlund, J. M., Johansson, A.V.J. |
| Document Type: |
Conference |
| Pubstate: |
Published |
| Journal: |
Advances in Turbulence V (Ed. Benzi, R.), Kluwer |
| Volume: |
398-402 |
| Year: |
1995 |
AbstractHot-wire measurements in air of \ $\overline^$ \ in the near wall region of a turbulent boundary layer at high Reynolds numbers indicate a thermal interaction for typical two-wire probes, such as X- and V-probes. In order to determine this interaction two infinitely long parallel wires have been studied numerically by solving the heat transfer equation. Computations give that for X- and V-probes a typical P\`clet number based on wire separation should be larger than about 50 to keep thermal interaction at an acceptable level. On the other hand for the Parallel-probe the results indicate that the P\`clet number should suitably be less than 10 to ensure good sensitivity and uniform response in the frequency range of interest.
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