NDLI: Improvement of cold-wire response for measurement of temperature dissipation

Content Provider	Springer Nature Link
Author	Lemay, J. Benaïssa, A.
Copyright Year	2001
Abstract	This work aimed at improving fine-scale measurements using cold-wire anemometry. The dissipation ɛ θ of the temperature variance was measured on the axis of a heated turbulent round jet. The measurements were performed with a constant current anemometer (CCA) operating fine Pt–10%Rh wires at very low overheat. The CCA developed for this purpose allowed the use of the current injection method in order to estimate the time constant of the wire. In the first part of the paper, it is shown that the time constants obtained for two wire diameters −d=1.2 and d=0.58 μm – compare well with those measured at the same time using two other methods (laser excitation and pulsed wire). Moreover, for these two wires, the estimated time constants were in good agreement with those obtained from a semi-empirical relation. In the second part of the paper, a compensation procedure – post-processing filtering – was developed in order to improved the frequency response of the cold-wire probes. The measurements carried out on the axis of the jet (Re D =16 500, Re λ ≃ 167) showed that the frequency response of the 1.2 μm wire was significantly improved. In fact, the spectral characteristics of the compensated signal obtained with the 1.2 μm wire compared fairly well with those from the 0.58 μm wire. Moreover, the results indicated that the compensation procedure must be applied when the cut-off frequency of the cold-wire f c is lower than two times the Kolmogorov frequency f K. In the case where f c ≃ 0.6f K, the compensation procedure can reduce the error in the estimate of ɛ θ by more than 20%. When f c ≃ 2f K, the effect of the compensation is reduced to about 5%.
Starting Page	347
Ending Page	356
Page Count	10
File Format	PDF
ISSN	07234864
Journal	Experiments in Fluids
Volume Number	31
Issue Number	3
e-ISSN	14321114
Language	English
Publisher	Springer-Verlag
Publisher Date	2001-09-05
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Fluid Flow and Transfer Processes Physics and Astronomy Mechanics of Materials Computational Mechanics

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