engleski

On the temperature corresponding to α=0.632 in non-isothermal JMA kinetics

The expression for rate, dalpha/dT, of nucleation and growth (NG) process under non-isothermal conditions, as described by Johnson-Mehl-Avrami (JMA) kinetic model, served as a basis for a detailed study of a class of functions Phi(m)=(dalpha/dT)Tm, where m is element of R. Studies of the fractional conversion, alpha, of the NG process at the temperature of the maximum of the function Phi(m), T=T(m), have shown that when reduced activation energy, x=E/RT, approaches infinity (x->infinity), fractional conversion, alpha, at the temperature corresponding to the maximum of the function Phi(m), alpha(m), converges to alpha=0.632, for any value of m. It has been further shown that fractional conversion, alpha, for the NG process is equal to alpha=0.632 at the temperature corresponding to the maximum of the function Phi(m)=(dalpha/dT)Tm for the particular value of the parameter m from the interval: 1 <= m <= 2.

Arrhenius integral ; fractional conversion ; JMA ; non-isothermal kinetic model

nije evidentirano