DiffusionKinetics

interface DiffusionKinetics

import type { DiffusionKinetics } from '@driftengine/chemistry';

In depth

This is what makes char glow for an hour instead of vanishing in seconds, and §7 says why. Above about 800 K the chemistry of carbon oxidation outruns oxygen delivery by an order of magnitude, so what you are actually watching is transport. The kinetic rate alone gives char that disappears; the cap gives char that sits there glowing, which is what char does.

The two combine as a series resistance — 1/k = 1/k_kinetic + 1/k_transport — which is the same arithmetic a shell boundary uses for the same reason, and it means neither side has to know about the other. And the transport half rises with the gas moving past, so blowing on embers makes them brighter and stops when you stop.

Properties