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Article
Starting radial subdiffusion from a central point through a diverging medium (a sphere): Heat-balance Integral Method
Thermal Science (2011)
  • Jordan Hristov
Abstract
The work presents an integral solution of the time-fractional subdiffusion equation as alternative approach to those employing hypergeometric functions. The integral solution suggests a preliminary defined profile with unknown coefficients and the concept of penetration (boundary layer) well known from the heat diffusion and hydrodynamics. The profile satisfies the boundary conditions imposed at the boundary of the boundary layer that allows its coefficients to be expressed through the boundary layer depth as unique parameter describing the profile. The technique is demonstrated by a solution of a time fractional radial equation concerning anomalous diffusion from a central point source in a sphere
Keywords
  • radial subdiffusion,
  • integral method,
  • heat-balance integral,
  • fractional Fourier number
Publication Date
Winter December 20, 2011
Citation Information
Jordan Hristov. "Starting radial subdiffusion from a central point through a diverging medium (a sphere): Heat-balance Integral Method" Thermal Science Vol. Thermal Science Iss. Supl. 1 (2011)
Available at: http://works.bepress.com/jordan_hristov/5/