Simulation of the flow of an explosive atmosphere exposed to a hot surface

The accidental ignition of combustible atmospheres by hot surfaces is great concern for chemical and process plant safety. In this paper, we present our research regarding the evolution thermal plumes originating from hemispheres discs. particular, focus on effect orientation surface process. auto-ignition temperatures locations were studied experimentally. To get further insight, conducted detailed numerical simulations validated them with measurements. Three-dimensional performed discs different orientations ranging 0{\deg} to 180{\deg}. solver employs a transient, implicit scheme which based coupled heat transfer flow equations. mesh in vicinity refined resolve steep temperature gradients capture boundary layer separation. influence critical spots gas mixture analysed examining structures buoyancy-driven flow. Using obtained results, discuss change onset location ignition.