Hot-wire spatial-resolution effects are investigated in a round jet, using custom-made probes with Platinum wires of 5 and 2.5 μmof diameter. Characteristic turbulent scales are varied by both moving the probes along the jet centerline (10 < x/D < 30), and using two different nozzle diameters at a constant Reynolds number of ReD = 7 × 104. The variance of spatial derivatives shows an attenuation of one order of magnitude greater than the velocity variance, i.e. 10-30% compared to 1-2%. Power spectra show this attenuation to be located at high frequencies, in agreement with the hypothesis of spatial-filtering effect.
Experimental study on hot-wire spatial resolution in turbulent round jet / Fiorini, T.; Bellani, G.; Cimarelli, A.; Talamelli, A.. - 165:(2016), pp. 249-252. [10.1007/978-3-319-29130-7_43]
Experimental study on hot-wire spatial resolution in turbulent round jet
Cimarelli A.;Talamelli A.
2016
Abstract
Hot-wire spatial-resolution effects are investigated in a round jet, using custom-made probes with Platinum wires of 5 and 2.5 μmof diameter. Characteristic turbulent scales are varied by both moving the probes along the jet centerline (10 < x/D < 30), and using two different nozzle diameters at a constant Reynolds number of ReD = 7 × 104. The variance of spatial derivatives shows an attenuation of one order of magnitude greater than the velocity variance, i.e. 10-30% compared to 1-2%. Power spectra show this attenuation to be located at high frequencies, in agreement with the hypothesis of spatial-filtering effect.
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