Abstract
A large amount of paint mist diffuses and escapes into the ambient air, forming oversprayed mist during the spraying process, which severely affects the environment in the spray booth and threatens worker health. To control the oversprayed mist and improve healthy work environments, a source control method is proposed: optimize the structure of the spray gun nozzle and introduce a protective annular airflow outside the spray gun jet. Different velocity ratios between the spray gun jet and annular airflow have different control effects on paint mist. Accordingly, a 2D particle image velocimetry (PIV) system is used to quantify the spraying flow field influenced by annular airflow under six velocity ratios. The results indicate that the annular airflow increases the axial velocity decay rate, suppresses entrainment, transfers energy and momentum to the spray gun jet and is an efficient source control method. The control effect has great advantages when the velocity ratio is 1.19 under our experimental conditions. In addition, we find that when the vorticity is the minimum, the control effect of the annular flow is optimal, which has guiding significance for the optimization of the spray gun. This research is expected to contribute accurate spraying flow field data to guide the design of spray gun nozzles to control oversprayed paint mist in spray booths.
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