Microlayer dynamics during the growth process of a single vapour bubble under subcooled flow boiling conditions.

In view of this, an ensemble average of the single-phase (bulk liquid under subcooled conditions) velocity field has been estimated and the corresponding convective time scales at different stages of the bubble growth process have been quantified by measuring the absolute fluid velocity at a height that corresponds to the diameter of the vapour bubble (apex of the vapour bubble). Thus, the initial growth of the vapour bubble, for I t i Graph $\lesssim$ 0.3 ms, is predominantly governed by the pressure difference (inertia-driven) and evaporation of the superheated liquid layer enveloping the nucleating vapour bubble (diffusion-controlled growth). During this time period, the liquid layer entrapped pushes the vapour bubble upwards and enables the vapour bubble to hover over the heated substrate, as observed after the detachment of the vapour bubble in figure 11( I b i ). Keywords: boiling; bubble dynamics EN boiling bubble dynamics 1 36 36 12/29/21 20220125 NES 220125 1. [Extracted from the article]