Characterization of the granular jet in a coaxial gas stream

The granular jet can behave macroscopically like a liquid jet and its dispersion process is similar to the breakup of the liquid jet by an annular air jet. In this paper, the particle dispersion characteristics of a granular jet by an annular air jet, such as the undisturbed length, the dispersion length and the dispersion angle, have been investigated experimentally with a high-speed camera. The results showed that the air jet velocity and granular jet mass flux are the main influencing factors on the undisturbed length and dispersion length of the granular jet. The particle diameter has few effects on the undisturbed length and dispersion length of the granular jet. The empirical equations of the undisturbed length, dispersion length and dispersion angle are obtained.

The particle dispersion characteristics of a granular jet by an annular air jet, such as the undisturbed length (L), the dispersion length (Lb) and the dispersion angle (θ), have been investigated experimentally with a high-speed camera and the empirical equations have been obtained.Figure optionsDownload as PowerPoint slideHighlights
► Dispersion of granular jet in a coaxial jet is similar to the liquid jet breakup.
► Dispersion characteristics of a granular jet in a coaxial jet are first investigated.
► Empirical equations of dispersion characteristics of a granular jet are obtained.
► Dispersion angle is determined essentially by the early oscillation of granular jet.