In presented work a hydrodynamic of bubble boiling process in quiescent water has been investigated using PIV (Particle Image Velocimetry) experimental technique. Velocity distribution in narrow region over the artificially produced nucleation site that was active during the partial developed nucleate boiling has been presented in more details. Experimental methodology is based on specially arranged boiling measurement procedure and it includes a statistic cross-correlation function for the raw velocity vectors estimation and validation protocol where refined velocity filed of bubbling process is attained. Review of vertical velocity components in natural convection and bubble boiling regime at two selected temperatures along the boiling surface is given and some comparison is carried out. Vertical velocity profiles around the rising bubbles are presented in qualitative manner and vertical pumping characteristics of boiling process vs. natural convection are compared.

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