Exothermic mixing process, energy release

Calculating the Energy Release of an Exothermic Mixing Process... 

Fig. 8A. The exothermic energy release of shocked but unreacted Ni-Al mixtures shows a profound change. A preinitiation" phenomenon in which reaction temper ture is reduced by over 200 °C is caused by the shock process. A compact composer of composite particles that inhibit mixing shows no such effect [88H01].

Heat of solution During the process of solvation, the solute must separate into particles. Solvent particles also must move apart in order to allow solute particles to come between them. Energy is required to overcome the attractive forces within the solute and within the solvent, so both steps are endothermic. When solute and solvent particles mix, the particles attract each other and energy is released. This step in the solvation process is exothermic. The overall energy change that occurs during the solution formation process is called the heat of solution. 

Let us first look at the similarities of the two firing modes. In both cases, fuel and oxidizer are introduced into the system. A diffusion flame is formed (in this section premixed flames are not a subject of interest). Both flames are practically governed by a mixing process which indicates the importance of the flow regime of the gases. An exothermic chemical reaction takes place with an energy release that then is transferred to the object of interest. The hot gases, the products of combustion, are exhausted from the system. 

Kuntz PJ, Nemeth EM, Polanyi JC, Rosner SD, Young CE. 1966. Energy distribution among products of exothermic reactions, II. Repulsive, mixed, and attractive energy release . J. Chem. Phys. 44(3) 1168-1184. Lennard-Jones JE. 1932. Processes of adsorption and diffusion on solid surfaces . Trans. Faraday Soc. 28 333-359. 

---