Temperature measurement around multiple boiling bubbles in a confined space using two-color laser-induced fluorescence

Boiling heat transfer has a combination of sensible liquid and latent due to vaporization. To examine the in boiling, thermometry liquid-vapor multiphase flow must play significant role. Although there are several optical methods proposed for boiling phenomena, it is challenging directly measure temperature field at relatively high flux many bubbles' interruption illumination observation. This study proposes novel method using confined space, sandwiched space between two transparency plates, two-color laser induced fluorescence distribution around multiple bubbles. The restricted fluid motion make possible illuminate observe almost whole area interest. intensity ratio kinds fluorescent dye exhibits local temporal without any invasion physical probes. We successfully observed scavenging superheated from surface demonstrate this method's utility. changes positions extracted experimental data with were consistent bubble behavior. also discussed remained issues on method.