Calibration of a temperature dissipation probe in decaying grid turbulence

Abstract

A four cold-wire probe, which allows all three components of the temperature dissipation rate ɛ _θ to be measured, is “calibrated” in decaying grid turbulence, where <ɛ _θ >, the mean value of ɛ _θ , can be determined accurately from the decay of the temperature variance <θ ²>. The probe yields values of the three components of <ɛ _θ > which are in reasonable agreement with local isotropy, in the range x ₁/M?50. The pdfs and spectra of the three temperature derivatives also satisfy local isotropy reasonably well.