Abstract
Hot-film measurements of the velocity gradient have been carried out in both laminar pipe and laminar plane Couette flow and have been compared with calculated values. The objective of this work was to determine the applicability of probes with two parallel sensors for gradient measurements. The investigation was done in the range 5 ≦ Re pr ≦ 365, with the Reynolds number Re pr based on the probe diameter and the local flow velocity. It was found that for Re pr > 10, measurements of the gradient result in values which are systematically too small. A curve enabling correction of measurement results is given.
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Böttcher, J., Eckelmann, H. Measurement of the velocity gradient with hot-film probes. Experiments in Fluids 3, 87–91 (1985). https://doi.org/10.1007/BF00276714
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DOI: https://doi.org/10.1007/BF00276714