Laser diagnostics for characterization of sprays formed by a collapsing non-equilibrium bubble

9th International Symposium on Cavitation

Kannan, Y.S.^1 ; Balusamy, S.^1 ; Karri, B.^1

Indian Institute of Technology, Hyderabad Ordnance Factory Estate, Yeddumailaram, Telangana

502205, India^1

关键词: Fuel sprays;    Laser sheets;    Low voltages;    Mie scattering;    Non equilibrium;    Numerical code;    Top surface;    Water surface;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/656/1/012114/pdf
DOI  :  10.1088/1742-6596/656/1/012114

来源: IOP

【 摘 要 】

In this paper, we investigate the use of laser diagnostic tools for in-plane imaging of bubble induced spray using a laser sheet and Mie scattering technique. A perspex plate of thickness 10 mm with a hole of diameter 1 mm in the center is placed in the middle of a glass tank filled with water such that the top surface of the plate coincides with the water surface. A bubble is created just below the hole using a low-voltage spark circuit such that it expands against the hole. This leads to the formation of two jets which impact leading to a spray and break-up into droplets. The spray evolution is observed using a laser sheet directed in a plane through the center of the hole. The illuminated plane is imaged using a high-speed camera based on the Mie scattering from glass beads suspended in the liquid. Results show that Mie scattering technique has potential in studying bubble-induced sprays with applications such as in fuel sprays, drug-delivery etc, and also for validation of numerical codes. We present results from our ongoing experiments in this paper.