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This study seeks to understand the origins of intermittency in quantities ofinterest in pool boiling, such as bubble departure diameter and departure time.The intermittency of nucleation site activity due to nonuniform and unsteadynear-wall temperatures is well-established; however, few mechanistic modelshave been developed that predict such intermittency. Here we assume afluctuating pressure field at a nucleation site due to adjacent bubbleactivity, which acts in combination with convective effects to alter bubblegrowth depending on the phase of the pressure oscillation with respect to theinstant of bubble nucleation. The results suggest that even when a singledeparture frequency is assumed for nearby bubbles, its effect on the nucleationsite being considered is to cause aperiodicity and intermittency in bubbledeparture quantities. The effects of pressure field phase angle, degree ofsuperheat, and choice of force balance model on the bubble departure quantitiesare examined. The phase angle of the pressure fluctuation at the instant ofbubble nucleation is shown to play a major role in determining bubble departurediameter and growth time. Departure diameter is observed to have a broaddistribution over long times of observation, belying the assumption of a uniquevalue. Period doubling of the ebullition cycle is observed for some conditions,a phenomenon documented by other investigators. The effects of dynamic contactangle.

Growth of a Bubble Under a Fluctuating Pressure Field