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Bubble growth, departure and sliding in low-pressure flow boiling hasreceived considerable attention in the past. However, most applications ofboiling heat transfer rely on high-pressure flow boiling, for which very littleis known, as experimental data are scarce and very difficult to obtain. In thiswork, we conduct an experiment using high-resolution optical techniques. Bycombining backlit shadowgraphy and phase-detection imaging, we track bubbleshape and physical footprint with high spatial (6 $\mu$m) and temporal (33$\mu$s) resolution, as well as bubble size and position as bubbles nucleate andslide on top of the heated surface. We show that at pressures above 1 MPa,bubbles grow in a heat-diffusion controlled regime and retain a spherical shapethroughout the growth and sliding process. We analytically derivenon-dimensional numbers to correlate bubble velocity and liquid velocitythroughout the turbulent boundary layer and predict the sliding of bubbles onthe surface, solely from physical properties and bubble growth rate. We alsoshow that these non-dimensional solutions can be leveraged to formulateelementary criteria that predict the effect of pressure and flow rate on bubbledeparture diameter and growth time.

Bubble departure and sliding in high-pressure flow boiling of water