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RESEARCH PAPERS: Heat Transfer in Manufacturing

Anomalous Diffusion in Short-Pulse Laser Interactions With Random Media

[+] Author and Article Information
M. C. Hipwell, C.-L. Tien

Department of Mechanical Engineering, University of California, Berkeley, CA 94720

J. Heat Transfer 118(3), 781-786 (Aug 01, 1996) (6 pages) doi:10.1115/1.2822699 History: Received October 09, 1995; Revised May 06, 1996; Online December 05, 2007

Abstract

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 corresponding to transport over the basic percolation unit (particle), the fractal cluster, and the homogeneous medium. Scaling is performed to determine the characteristic time scales of anomalous diffusion. The dependence of these time scales on both material properties and structure is examined to assess the impact of the anomalous diffusion regime on short time-scale energy transport. Additional criteria that determine the importance of anomalous diffusion relative to other transport phenomena and properties, such as radiation and thermal boundary resistance, are established.

Copyright © 1996 by The American Society of Mechanical Engineers
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