Abstract
Flow blurring (FB) atomization is a liquid fragmentation mode that encourages formation of air bubbles in the liquid core. This paper presents an optically accessible FB atomizer design with liquid tube recess control, which allows for continuous transition from FB to flow focusing (FF) atomization regimes under fixed air to liquid mass flow ratio (ALR). FF here approximates air-blast (AB) atomization. The optically accessible injector enables investigation of the effects of Weber number (We) and tube recess on spray droplet size and flow field for a wide range of operating conditions using a Phase Doppler Anemometry (PDA) system while visually confirming the FB atomization regime. Experiments were carried out with water and air as the working fluids at atmospheric conditions. The results have shown that operation in the FB regime generates smaller droplets compared to the FF regime in the spray core. Differences in the overall flow-field between the two atomization regimes are also noted, particularly in the near-field region.
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