An ultrasonically generated pulsating water jet (UPWJ) can be produced by the action of an ultrasonic sonotrode on a liquid in an acoustic pressure chamber, whereby its acoustic action may affect the resulting outflow velocity. This study presents a theoretical approach to estimating the peak UPWJ outflow velocity that, in addition to hydraulic pressure, accounts for the possible acoustic contribution of the sonotrode. For the analyzed technological conditions, the estimated peak UPWJ outflow velocity was 270.74 ms-1, representing an increase of approximately 7.24% compared with 252.47 ms-1 determined using the conventional calculation without including the acoustic contribution. The effect of this difference was subsequently assessed also through the calculated maximum impact pressure. The results indicate the potential significance of the acoustic contribution of the sonotrode in the theoretical estimation of the peak UPWJ outflow velocity and in the subsequent interpretation of its mechanical action on the material, particularly at relatively small standoff distances.
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