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Y-jet 노즐의 출구오리피스 형상이 비대칭 분무에 미치는 영향
백광열 ( Gwang Yeol Baik ),홍정구 ( Jung Goo Hong ) 한국분무공학회 2021 한국액체미립화학회지 Vol.26 No.1
Y-jet nozzle has a wide fuel flow rate range and turn-down ratio, thus, it is used in industrial boilers, furnace and agricultural atomizer. However, it has asymmetrical spray characteristics due to the nozzle design factors. Therefore, in this study, asymmetric spraying characteristics of the elliptical Y-jet nozzle was studied by using the lab-scale spray apparatus. As a result, the elliptical Y-jet nozzle had lower gas mass flow rate than circular Y-jet nozzle at same gas pressure, because of bigger shear stress due to the wider inner surface at the elliptical Y-jet nozzle. Larger SMD was measured on the elliptical Y-jet nozzle than the circular Y-jet nozzle. When SMD was measured in the X_Axis direction at the same gas mass flow rate, the elliptical Y-jet nozzle with an aspect ratio of 2:1 showed greater asymmetry than the others.
Effects of Working Fluids on Spray Modes and Atomization Characteristics in Electrospray
김지엽(Ji Yeop Kim),이상지(Sang Ji Lee),백광열(Gwang Yeol Baik),홍정구(Jung Goo Hong) Korean Society for Precision Engineering 2021 한국정밀공학회지 Vol.38 No.1
An electrospray is widely used in the industry due to uniform and continuous droplet generation. Most of the studies on the electrospray modes are conducted in the cone jet mode. The goal of this study is to confirm the spray patterns for each mode of the electrospray by setting various conditions, such as nozzle to substrate, nozzle diameters, fluid properties (Viscosity and Conductivity), and flow rate. As a result, 7 modes were observed by the applied voltage and flow rate. It was confirmed that the smallest droplet size was produced in the cone jet mode and working fluid V (High Conductivity).