EXPERIMENTAL INVESTIGATION OF CAPILLARY INSTABILITY - RESULTS ON JET STIMULATED BY PRESSURE MODULATIONS

We investigate the behaviour of a liquid jet stimulated by pressure di sturbances using a photometric measurement of the jet shadow width. Tw o apparatuses involving lights of different nature are utilized and me asurements are taken from the exit of the nozzle to drop breakoff for different operating conditions. Fourier analysis is applied to charact erize the spatial evolution of the jet shape. In contrast to previous studies where only amplitudes of the Fourier modes are reported, phase shifts are also recovered for low and high initial perturbations. We show that the spatial reconstruction of the jet from the temporal Four ier analysis at different abscissae is in excellent agreement with the experimental profiles.