Experiment and numerical analysis are presented to demonstrate that a hot-wire anemometer probe reduces spatial aliasing of turbulent velocity fluctuations because of the filtering property of the probe sensing element. The experiment focuses on the one-dimensional turbulent velocity spectrum and utilizes a long sensing length hot-wire probe to exaggerate the effect of the sensing element on the turbulent field. The numerical analysis utilizes a model of the hot-wire probe from Wyngaard (1968) along with isotropic turbulence relations to obtain an equation for the hot-wire response in a turbulent velocity field. The model can be used to determine the effect of hot-wire length on the one and three-dimensional turbulent spectra.
Experiments in Fluids – Springer Journals
Published: Jul 28, 1997
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