Pressure Sensitivity and Surface Temperature

Experimental measurements of mass burning rate (r ) are frequently expressed in terms of a ballistic law for steady state combustion, 

The mass-burning rate predicted by this model is higher than experimental values. This results in a difference between this model and WSB model. The analytical WSB solution assumes that the solid phase reaction only occurs at a lengthless surface. In this model, however, condensed phase reaction occurs in multiple grids therefore, the mass loss is an integral over all burning grids. 

The pressure dependence of the mass burning rate is also shown in Fig. 5. The pressure sensitivity n of this model is 0.59, somewhat lower than 

The predicted surface temperature as a function of pressure is compared with the WSB model and Zenin s data [36] in Fig. 6. It s in fairly good agreement with WSB model, especially at 20 atm. 

Temperature sensitivity is the dependence of the steady bum rate on the initial (bulk) temperature of the HMX. The sensitivity coefficient is defined as 

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