The Two-Phase High-Speed Stream at the Centerline of a Hollow-Cone Spray Produced by a Pressure-Swirl Nozzle

详细信息    查看全文

• 作者：Wei Du ; Ze Sun ; Guimin LuJianguo Yu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2017
• 出版时间：January 11, 2017
• 年：2017
• 卷：56
• 期：1
• 页码：359-367
• 全文大小：677K
• ISSN：1520-5045

文摘

The flow characteristics of hollow-cone sprays produced by pressure-swirl nozzles were investigated by particle image velocimetry (PIV) and computational fluid dynamics. Two high-speed characteristic droplet velocities were observed by PIV captures at the periphery and centerline of the spray cone. Such flow characteristics were also simulated by two-dimensional axisymmetric simulations. In the simulation, in addition to the two high-speed characteristic droplet velocities, a high-speed air stream at the spray centerline was also observed. This high-speed air stream converged and accelerated small droplets to form the high-speed droplet stream. After further simulation, it was found that the largest droplets carried by the high-speed air stream at the centerline were most efficient in the momentum transfer process between two phases. The influence of the two-phase high-speed stream on the heat- and mass-transfer process is meaningful for related spray operation research and should be seriously considered.