Mathematical Modeling for Production Unit of Ethylene by Steam Cracking Process

To gain a general understanding of atomization and sheet breakup processes, the interaction of pressure-swirl hollowcone sprays and a quiescent medium was investigated computationally. The spray characteristics of Iso-octane (n- 8 18 C H ) with high pressure-swirl injector in the ambient conditions are modeled. The Linearized Instability Sheet Atomization (LISA) model has been used to describe the primary breakup processes of the spray. Sauter mean diameter, sheet thickness and exit velocity were computed as the results of primary breakup. Disintegration of large drops is simulated using Taylor analogy breakup (TAB) model in which the Rosin-Rammler distribution is used. Evaporation and collision models are deactivated in this study. The model considers the transient behavior of the pre-spray and steady-state behavior of the main spray for two various injection pressures and liquid mass flow rates. Qualitative and quantitative comparisons between the simulated and experimentally measured results were made. The numerical simulations can successfully demonstrate the spray characteristics, such as spray tip penetration, drop sizes and overall spray structure.

Keywords:

Spray characteristics , primary breakup , secondary breakup , penetration