ON THE MEASUREMENT OF TURBULENCE ENERGY-DISSIPATION

The article discusses different metrological problems connected with t he use of a hot-wire technique in the measurement of turbulence energy dissipation. In particular a short review of the experimental evidenc e for and against the local isotropy hypothesis is presented and its c onsequence for the design of hot-wire systems and data processing is d iscussed. Finally, the finite spatial resolution of a hot-wire techniq ue is analysed with special emphasis on measurement of the dissipation rate and the correction of experimental results.