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- W4288075204 abstract "We consider the classical problem of particle diffusion in d-dimensional radially-symmetric systems with absorbing boundaries. A key quantity to characterise such diffusive transport is the evolution of the proportion of particles remaining in the system over time, which we denote by P(t). Rather than work with analytical expressions for P(t) obtained from solution of the corresponding continuum model, which when available take the form of an infinite series of exponential terms, single-term low-parameter models are commonly proposed to approximate P(t) to ease the process of fitting, characterising and interpreting experimental release data. Previous models of this form have mainly been developed for circular and spherical systems with an absorbing boundary. In this work, we consider circular, spherical, annular and spherical-shell systems with absorbing, reflecting and/or semi-absorbing boundaries. By proposing a moment matching approach, we develop several simple one and two parameter exponential and Weibull models for P(t), each involving parameters that depend explicitly on the system dimension, diffusivity, geometry and boundary conditions. The developed models, despite their simplicity, agree very well with values of P(t) obtained from stochastic model simulations and continuum model solutions." @default.
- W4288075204 created "2022-07-28" @default.
- W4288075204 creator A5018103083 @default.
- W4288075204 date "2022-11-01" @default.
- W4288075204 modified "2023-10-01" @default.
- W4288075204 title "Exponential and Weibull models for spherical and spherical-shell diffusion-controlled release systems with semi-absorbing boundaries" @default.
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- W4288075204 doi "https://doi.org/10.1016/j.physa.2022.127985" @default.
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