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Arrhenius Rate Sensitivity

Plot reaction-rate change and stiffness risk from temperature and activation energy.

visual calculatorCombustion & Reacting Flow

Read the flow shape before trusting the number.

This page turns a CFD setup into regime, scale, and dominant-effect cues. Adjust the calculator below and compare the moving graphic with the computed result.

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Arrheniusreaction ratestiffnesschemistry
formula
KaTeX rendered
k = A exp(-E_a/(R T))d ln k / dT = E_a/(R Tˆ2)\begin{aligned}\text{k = A exp(-E\_a/(R T))}\\[0.35em]\text{d ln k / dT = E\_a/(R T\^{}2)}\end{aligned}
ASCII sourcek = A exp(-E_a/(R T)), d ln k / dT = E_a/(R T^2)
Arrhenius rate sensitivitytemperaturelog10(k)
rate k
3.294e+4
k(T+10K)/k(T)
1.0685
d ln k / dT
0.006682

Useful for checking whether reacting-flow time steps and source-term linearization will be stiff at the chosen temperature.

Arrheniusreaction ratestiffnesschemistry