Numerical study on the effect of angle variation of convergent-divergent ejector-nozzle for salt dispersion from ground-based on weather modification process

A numerical study on the effect of angle variation of convergent-divergent ejector-nozzle for salt dispersion from ground-based on the weather modification process is presented in this paper. Forest and land fires in Indonesia are problems that routinely occur every year, especially during the dry season. A weather modification process is usually done by dispersing salt above the cloud. Due to the expensive cost of the working process, a ground-based tool called convergent-divergent ejector-nozzle to disperse the salt from the ground has been developed. A 3-dimensional analysis of fluid dynamics using computational fluid dynamics software has been done to study 4 different ejector models which can disperse the salt and reach the target height. From this simulation, the convergent-divergent ejector-nozzle was confirmed to be the best model. A further computational fluid dynamics analysis was done using 2-dimensional simulation to know the effect of angle variation on the performance of convergent-divergent ejector-nozzle. It was found that the convergent-divergent ejector-nozzle has the potential to throw the salt to 25 m height with a flow velocity of 2 m/s. However, when the angle of the secondary flow pipe was changed, there was no apparent effect on the noise level, jet flow velocity level and entrainment ratio.