Twin-fluid atomization of viscous liquids: The effect of atomizer construction on breakup process, spray stability and droplet size

摘要

This study focuses on the low-pressure spraying of viscous liquids (mu = 60, 147 and 308 mPa s) using four types of internal-mixing twin-fluid atomizers. We compare two well-known designs, namely the Y-jet and "outside in gas" (OIG) effervescent atomizers, with our new design (CFT) and an "outside in liquid" (OIL) configuration for the effervescent atomizer. The atomizers were operated by two gas inlet pressures (0.14 and 0.28 MPa) and various gas-to-liquid ratios (GLR = 2.5%, 5%, 10% and 20%). The comparison focused on internal liquid-gas flow, spray stability, primary breakup, and droplet size.