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An SPIV experiment using two orthogonal planes simultaneously was performedin the LML boundary layer facility to specifically measure all of thederivative moments needed to estimate the dissipation rate of the TurbulenceKinetic Energy. The Reynolds number was $Re_\theta = 7500$ or $Re_\tau = 2300$.A detailed analysis of the errors in derivative measurements was carried out,as well as applying and using consistency checks derived from the continuityequation. The random noise error was quantified, and used to ``de-noise'' thederivative moments. A comparison with a DNS channel flow at comparable Reynoldsnumber demonstrated the capability of the technique. The results were furthervalidated using the recent theory developed by George and Stanislas 2020. Theresulting data have been extensively used in parts I and II of the presentcontribution to study near wall dissipation. An important result of the presentwork is the provision of reliable rules for an accurate assessment of thedissipation in future PIV experiments.

Velocity derivatives in a high Reynolds number turbulent boundary layer.  Part III: Optimization of an SPIV experiment for derivative moments  assessment