Experimental validation of global rainbow thermometry simulations

Improvements on the Global Rainbow Thermometry (GRT) technique are being presented. The GRT technique allows us to study the physical properties of liquid-in-liquid and liquid-in-air dispersions. In this paper the influence of droplet non-sphericity on the size and temperature measurements of liquid droplets suspended in a liquid or a gaseous bulk will be analyzed. A new theoretical model that takes into account the effect of the non-spherical droplets on the GRT signal will be proposed and a data inversion algorithm is described. It allows to automatically find the optimized parameters of the simulation of experimental Global Rainbow patterns. Experimental validation of the rainbow thermometry technique is performed, measuring the droplet size and temperature by means of alternative techniques to compare with the present method. For this purpose, an original experiment has been designed.status: publishe