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Thermal Structure in the Gas Phase

Similar to the expression for the condensed phase, the thermal diffusivity in the gas phase is given by g = Xg/pgCg and is assumed to be independent of temperature. The thermal wave thickness in the gas phase 6g is defined according to 6g = Og/Mg. Then, Eq. (3.46a) can be written as  [Pg.59]

When the term in the exponent Xg/6g 1, a simplified expression for the heat flux feedback from the gas phase to the solid phase is obtained  [Pg.60]

This asymptote occurs whenever the heat transferred back to the burning surface is small compared to the heat released in the gas phase, which implies that Xg/bg is sufficiently large. Though Eq. (3.48) is not precise, it indicates the burning rate behavior without introducing mathematical complexities and reaction parameters. [Pg.60]

If one can assume that the chemical reaction represented by a step function starts at %i = 0, i. e. the burning surface, and ends at x = Xgin the gas phase, as shown in Fig. 3.14, Eq. (3.46d) can be rewritten as [Pg.60]


See other pages where Thermal Structure in the Gas Phase is mentioned: [Pg.59]    [Pg.59]   


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