The effect of ultra-low temperature on the flammability limits of a methane/air/diluent mixtures

A Numerical Study on the Effect of Temperature and Composition on the Flammability of Methane–Hydrogen Sulfide Mixtures

“…The simulation parameters ratio, slope, and curve were equal to 3, 0.07, and 0.14, respectively. These values were selected to optimize the simulation time, costs required, and number of point in the output files (around 250-300 points) without affecting the accuracy of obtained results, as reported elsewhere (Pio and Salzano, 2019). Moreover, the relative error criteria and absolute error criteria were kept constant at 1.0 × 10 −9 and 1.0 × 10 −14 for steady-state problem and 1.0 × 10 −5 and 1.0 × 10 −14 for time stepping problem (used by the code as first attempt solution), respectively.…”

Implementation of gas-phase kinetic model for the optimization of the ethylene oxide production

“…This procedure has been validated for the indirect estimation of the effect of dilution and temperature on the lower and upper flammability limits or minimum oxygen concentration, in the presence of methane (Pio and Salzano, 2018b) and alkenes (Pio and Salzano, 2018c) and for several hydrocarbons mixtures (Bertolino et al, 2019). Grid refining parameters and tolerance criteria for steady-state (SS) and time stepping (TS) problems (Table 3) were selected in accordance with the grid sensitivity analysis reported elsewhere (Pio and Salzano, 2019). The adiabatic flame temperatures (T ad ) at resulting compositions were compared to validate the threshold temperature concept.…”

Realistic aviation fuel chemistry in computational fluid dynamics

“…The refine criteria ratio, slope and curve were set equal to 3, 0.07 and 0.14, respectively. These values were selected after a grid dependency analysis [41]. Similarly, the relative value adopted to perturb the system (dK) was equal to 1•10 −2 .…”