Steady SHS process

Within the region of optimal experimental parameters, the combustion wave velocity remains constant and the temperature profile T(t) has the same form at each point of the reaction medium. This regime is called steady propagation of the combustion synthesis wave, or steady SHS process. As the reaction conditions move away from the optimum, where the heat evolution decreases and/or heat losses increase, different types of unsteady propagation regimes have been observed. These include the appearance of an oscillating combustion synthesis... 

Equations (22.38) and (22.39) give the steady-state concentrations of the substance in the NH and SH troposphere, respectively (Q = Q h and Qi = Q as a function of the source rates into the two hemispheres and all the transport and removal parameters of the four compartments. Steady-state concentrations in the two stratospheric reservoirs, Qi = nh and = Gsh are then obtained from (22.34) and (22.35). These equations provide a general, steady-state analysis of a four-compartment model of a substance that is emitted into the troposphere and removed by separate first-order processes in each of the four compartments. 

It is assumed that the tank was filled with molten glass initially at 1160 C. A semiellipsoid volume (the semi-major axis and semi-minor axis ate 0.02 and 0.006 m, respectively) of glass was created at the outlet of orifice to simulate the initial gob sh e as shown in Fig. S. The steady state calculation was carried out with the orifice exit modeled as a pressure outlet (P - Pam). The results fiom the steady-state model were then used as initial conditions fin the following transient model that simulates the actual glass gob forming process. 

---