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ENHANCED ATOMIZATION OF VISCOUS LIQUIDS USING A COUNTERFLOW NOZZLE
Atomization and Sprays ( IF 1.2 ) Pub Date : 2022-02-01 , DOI: 10.1615/atomizspr.2022038534
Vinod Srinivasan 1 , Roshan Rangarajan 1
Affiliation  

This study examines the atomization of viscous liquids using a recently developed internal mixing nozzle design, the ’counterflow’ nozzle. Based on insights fronlinear stability theory, the geometry seeks to establish a countercurrent two-phase mixing layer inside the nozzle, with the low density high-speed gas next to the wall. Three liquids with widely varying viscosity (water, proylene glycol, and an 85% aqueous solution of glycerol) are tested for a range of air-liquid mass flow ratios, and for a fixed volume flow rate of 60 ml/min. A flow-blurring nozzle is used as a reference for comparison High speed imaging suggests that the liquid emerges from the counterflow nozzle orifice as a spray, with little development downstream of the nozzle exit. Droplet diameter distributions are measuring using a shadowgraphic technique, and are found to have a very weak dependence on the liquid viscosity. Pressure drop measurements are combined with Sauter Mean Diameter values to evaluate spray efficieincy, and it is found that the counterflow nozzle displays enhanced efficieny, especially at low values of air mass flow rates.

中文翻译:

使用逆流喷嘴增强粘性液体的雾化

本研究使用最近开发的内部混合喷嘴设计“逆流”喷嘴检查粘性液体的雾化。基于对非线性稳定性理论的见解,几何结构寻求在喷嘴内建立逆流两相混合层,低密度高速气体靠近壁面。测试了三种粘度变化很大的液体(水、丙二醇和 85% 的甘油水溶液)的空气-液体质量流量比范围和 60 毫升/分钟的固定体积流量。流动模糊喷嘴用作比较的参考高速成像表明,液体从逆流喷嘴孔喷出,喷嘴出口下游几乎没有发展。使用阴影图技术测量液滴直径分布,并且发现对液体粘度的依赖性非常弱。压降测量与 Sauter 平均直径值相结合以评估喷雾效率,发现逆流喷嘴显示出更高的效率,尤其是在空气质量流量较低的情况下。
更新日期:2022-02-01
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