Heating zone expansion

Although Van Hise attributed the gross deformation of rocks to physical causes, he believed that their alteration was a chemical, or physico-chemical, problem. Thus, he maintained that a different set of chemical reactions characterized the alteration of rocks in each zone. In the zone of fracture, reactions typically occurred with the expansion of volume and the liberation of heat oxidation, carbonation, and hydration. In the lower zone, these reactions were reversed as pressure rather than temperature became the factor controlling chemical change. 

In lambda transitions, no discontinuity in enthalpy or entropy as a function of T and/or P at the transition zone is observed. However, heat capacity, thermal expansion, and compressibility show typical perturbations in the lambda zone, and T (or P) dependencies before and after transition are very different. 

It is significant that, throughout the reaction zone, the velocity of transport of an acoustic perturbation w + c exceeds the detonation velocity expansion of one layer, caused by release of reaction heat, is conveyed to another and beyond to the original mixture. The mechanism of detonation... 

The three-dimensional, fully parabolic flow approximation for momentum and heat- and mass-transfer equations has been used to demonstrate the occurrence of these longitudinal roll cells and their effect on growth rate uniformity in Si CVD from SiH4 (87) and GaAs MOCVD from Ga(CH3)3 and AsH3 (189). However, gas expansion in the entrance zone combined with flow obstructions, such as a steeply sloped susceptor, can also produce... 

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