Experimental Investigation of Liquid Jet Breakup in a Cross Flow of a Swirling Air Stream

Abstract

This paper presents the results of an experimental investigation of liquid jet breakup in a cross flow of air under the influence of swirl (swirl numbers 0 and 0.2) at a fixed airflow Mach number 0.12 (typical gas turbine conditions). The experiments have been conducted for various liquid to air momentum flux ratios (q) in the range of 1 to 25. High speed (@ 500 fps) images of the jet breakup process are captured and those images are processed using MATLAB to obtain the variation of breakup length and penetration height with momentum flux ratio. Using the high speed images, an attempt has been made to understand the physics of the jet breakup process by identification of breakup modesbag breakup, column breakup, shear breakup, and surface breakup. The results show unique breakup and penetration behavior which departs from the continuous correlations typically used. Furthermore, the images show a substantial spatial fluctuation of the emerging jet resulting in a wavy nature related to effects of instability waves. The results with 15 deg swirl show reduced breakup length and penetration related to the nonuniform distribution of velocity that offers enhanced fuel atomization in swirling fuel nozzles.

Concentration of Antioxidant Compounds from Calendula officinalis through Sustainable Supercritical Technologies, and Computational Study of Their Permeability in Skin for Cosmetic Use

“…Tentatively, most of the developments for the different steps implied in SAS could be adapted to SAF [ 32 ]. There are specialized papers about SAS that model both the whole process [ 67 , 68 , 69 ] as well as specific steps, such as breakup of the feed solution jet in the supercritical CO 2 stream [ 70 , 71 , 72 ], mass transfer between droplets of organic solution and the compressed antisolvent [ 73 , 74 , 75 ], supersaturation and nucleation rate [ 76 , 77 , 78 ], growth mechanism [ 79 ], or the influence of the variables on precipitation [ 80 ]. However, as explained in a previous work [ 50 ], detailed modelling of the SAF process is quite a complex task, because of the high number of components in the extracts that usually need to be processed, then becoming rather inextricable from a rigorous theoretical study.…”