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I am trying to find out correlation for ignition delay for alkane fuels. The activation energy part of the correlation gives me a negative value. For the ignition delay formulation, is it possible to have an overall activation energy part being negative?

$$\tau = P^aT^b\phi^c\exp\left(\frac{E_\mathrm{a}}{RT}\right)$$

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    $\begingroup$ Well, it sure is possible and does happen sometimes for complex reactions, dunno if it applies for your case, though. $\endgroup$
    – Mithoron
    Dec 15, 2019 at 14:20
  • $\begingroup$ This might be helpful: chemistry.stackexchange.com/questions/95343/… $\endgroup$
    – theorist
    Dec 15, 2019 at 23:45

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