Thermal explosion characteristics of a combustible gas containing fuel droplets. Issue 3 (September 2021)

• Record Type: Journal Article
• Authors: El-Sayed, Saad A.
• Is Part Of: International journal of spray and combustion dynamics. Volume 13:Issue 3/4(2021)
• Page Start: 124
• Page End: 145
• Publication Date: 2021-09
• Subjects: Thermal explosion -- combustible gas -- fuel droplets -- critical conditions for ignition -- numerical analysis; Combustion engineering -- Periodicals; Fluid dynamics -- Periodicals; Combustion -- Periodicals; Spraying -- Periodicals; Combustion; Combustion engineering; Fluid dynamics; Spraying; Periodicals; 541.361
• DOI: 10.1177/17568277211057360
• Languages: English
• ISSNs: 1756-8285

Abstract

This paper investigated the critical ignition conditions of combustible gas containing liquid fuel droplets. The analysis is done based on the criteria of the thermal explosion theory. It includes analytical and numerical solutions of modeling equations of fuel droplets heating and evaporation by convection and radiation from the surrounding reactive hot gas. The exothermic reaction is usually modeled as a single-step reaction obeying an Arrhenius temperature dependence. The thermal conductivity of the fuel droplet is dependent on temperature. The analytical solution produced relations between the main critical characteristic parameters in all planes of the solution. The results obtained from investigating the effect of the characteristic parameters on the explosion behavior of gas and fuel droplets and the thermal radiation proved that both of them are significant. The study proved that the criticality definitions of the thermal explosion of a single-phase system can be used effectively and efficiently to determine the critical conditions of a multi-phase system. Finally, the application of the numerical solutions of the modeling equations was used to analyze the explosion characteristics of a diesel fuel spray system.