On the determination of transit times during flow oscillations

The determination of transit times of single-phase flow during flow oscillations is treated. Starting from theoretical considerations derived on the basis of noise analysis techniques, numerical simulations have been carried out to understand the physical meaning of the cross correlation function and of the phase shift between the noise signals of two axially separated sensors during constant-amplitude flow oscillations. The analysis of experiments performed on a natural circulation cooled water/steam loop is also reported.