Experimental and numerical study of microdroplet vaporization using pulsed laser and nanoparticles

초록

Laser-induced vaporization of dodecafluoropentane (DDFP) droplets containing single or countable gold nanoparticles was studied by analyzing visual images of bubbles and droplets captured with a high-speed camera. Numerical modeling was performed to compensate for the experimental limitations in measuring bubble nucleation and initial bubble growth. The present experiment demonstrates that the bubble growth rate increases significantly as the thermal boundary layer expands into the surrounding water and the bubble oscillation after vaporization is significantly damped by the wall. One-dimensional numerical predictions of bubble growth obtained were observed to match well with the experimental data under the conditions of increased water viscosity and initial bubble radii of 0.3-0.8 & mu;m. The effects of initial droplet size, ambient temperature and number of gold nanoparticles on the droplet vaporization were quantified.

키워드