figshare
Browse
uast_a_1390207_sm4660.pdf (481.44 kB)

Visualization and size-measurement of droplets generated by Flow Blurring® in a high-pressure environment

Download (481.44 kB)
Version 3 2019-10-24, 12:28
Version 2 2017-11-16, 14:27
Version 1 2017-10-12, 17:19
journal contribution
posted on 2019-10-24, 12:28 authored by Luis B. Modesto-López, Alfonso M. Gañán-Calvo

Flow Blurring® (FB) atomization is a highly efficient method to produce aerosols. It originates from an unexpected turbulent back flow motion in the interior of the atomizer. The onset for the appearance of such pattern is dictated by a geometrical parameter, ϕ, that is, the ratio of the distance from the tip of the liquid feeding tube to the discharge orifice (H), and the diameter of the discharge orifice (D). In this work, a FB atomizer with a nominal ϕ = 1/6 was used to produce water and ethanol droplets into pressurized environments (>1 MPa). The droplet size distributions and mean droplet speeds were investigated using (1) direct visualization with an ultra-high-speed video camera coupled with an automated droplet measurement (ADM) program and (2) using a light scattering instrument. Light scattering measurements, with water and ethanol, varying the driving pressure to produce the aerosol (ΔP), indicate a power dependence of ∼2/5 of the dimensionless mean droplet diameter (D¯/Do) on the dimensionless liquid flow rate (Q/Qo). At higher liquid flow rate, the optical resolution of the droplets is improved compared to lower volumetric flow rates, thus facilitating analyses with the ADM program. The approach outlined herein provides a guideline for characterization and implementation of the FB technology in high-pressure applications.

Copyright © 2018 American Association for Aerosol Research

Funding

LBML acknowledges financial support from the Ministry of Economy and Competitiveness of Spain through the ‘Juan de la Cierva” Program (reference JCI-2012-12037). This work was supported by the Spanish Ministry of Economy, Grant DPI2013-46485.

History

Usage metrics

    Aerosol Science and Technology

    Keywords

    Licence

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC