Nozzle flow with finite-rate chemistry

The material in Chapter 4, on finite-rate chemistry in flows with negligible molecular transport, has been amplified to a lesser extent beyond the presentation in the first edition. The discussions of ignition delay and of the well-stirred reactor have been expanded somewhat, and a treatment of two-phase nozzle flow has been added, while elsewhere in the chapter modifications in the writing have been restricted to updating of ideas. 

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