Abstract
A theory is presented which describes the tree-like pore structure of carbon char. Eachpore that reaches the exterior surface of a char particle is depicted as the trunk of a tree. A statistically derived and empirically verified pore distribution function specifies the size distribution of the tree trunks on the particle surface. A continuous branching description of the pore tree predicts the number and size of the pores as a function of the skewed distance into the pore tree. The pore structure is completely specified through measured values of the porosity θ, internal surface area s p , and the particle radius a . The oxidation rate of carbon char is shown to be sensitive to the structure of the pore tree and the present theory is shown to accurately model the oxidation data base.
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