Simultaneous laser-induced fluorescence, particle image velocimetry and infrared thermography for the investigation of the flow and heat transfer characteristics of nucleating vapour bubbles

Boiling is an effective heat removal process, used for exchange and thermal management purposes in many technological applications, from the scale of microelectronic devices to nuclear reactors. However, physical mechanisms involved this process are not fully understood yet due complexity that arises interacting underlying sub-processes nucleation, growth detachment bubbles occur during process. Here, we present advanced methodology based on combined, synchronized high-speed infrared (IR) thermometry, ratiometric two-colour laser-induced fluorescence (2cLIF) particle image velocimetry (PIV), along with sample results experimental investigation conducted deionized water, aimed at elucidating bubble lifecycle. IR thermometry measure time-dependent 2-D temperature flux distributions over a boiling surface, 2cLIF temperature-field vertical plane, liquid phase around developing bubbles. Furthermore, PIV velocity fields bubbles, same plane as 2cLIF. The reveals allows us quantify fundamental transfer aspects such contribution triple contact line evaporation dynamics near-wall superheated layer, mixing effect produced by departure, convection effects bubble, quenching transfer. Specifically, observe that, our experiment, slowly growing microlayer does form, solid-liquid-vapour contributes approximately one third total transferred bubble. We also observed fluid rewets dry spot base, departs comes boundary layer adjacent i.e., it warmer than bulk. confirm finding modelling transient conduction