A numerical solution based on a varying node volume for the mass diffusion, thermal response during a dilution experiment of a reacting mixture was performed. The unique feature of the solution was its use of partial volumes and incorporating the changes in heat transfer area and internal node volume changes. The limiting behavior of these transient responses was in agreement with expected analytical results. The resulting temperature and concentration responses were used with a typical EOT calibration relation to estimate its response during an experiment. The calculated EOT and temperature time response exhibit the same trends as that observed experimentally.
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