ANOMALOUS DIFFUSION IN SHORT-PULSE LASER INTERACTIONS WITH RANDOM-MEDIA

This work applies fractal percolation theory to examine the impact of anomalous diffusion in short time-scale applications of random media. It is shown that there exist three regimes of heat transport correspon ding to transport over the basic percolation unit (particle), the frac tal cluster, and the homogeneous medium. Scaling is performed to deter mine the characteristic rime scales of anomalous diffusion. The depend ence of these time scales on both material properties and structure is examined to assess the impact of the anomalous diffusion regime on sh ort time-scale energy transport. Additional criteria that determine th e importance of anomalous diffusion relative to other transport phenom ena and properties, such as radiation and thermal boundary resistance, are established.