Paper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.
This paper addresses the basic nucleation and bubble
dynamics mechanisms, focusing on the effect of enhancing the
surface. The consequences at the heat transfer mechanisms are
also discussed. The review performed here stresses the need to
accurately describe the effect of surface topography and
wettability, as this is a critical step to lessen the strong
empirical nature that is present in most of the theoretical
predictions.
This accurate description also requires adequate diagnostic
techniques. Combining Particle Image Velocimetry – PIV with
high speed imaging and thermography has been recently
reported in the literature to render precise measurements of
several quantities such as bubble departure diameters and
frequencies, and even thickness of the micro layer, which are of
major importance to validate theoretical correlations.
The experimental analysis performed here also highlights
the important role of the interaction mechanisms in bubble
dynamics and consequently in the heat transfer mechanisms.
