Breakup of elliptical liquid jets in gaseous crossflows at low Weber numbers

An Artificial Neural Network for the Prediction of Penetration Height of Aerated Elliptical Liquid Jets in Gaseous Crossflows

“…The test section, which is made of clear acrylic, has a cross section of 100×100 mm 2 and a length of 750 mm. The PIV result has shown that the air velocity inside the test section is uniform (except for the thin boundary layers on the walls) and can reach 45 m/s [14]. In the present study, the air velocity inside the test section is measured by a Pitot tube.…”

“…In addition, two orifices are designed as the bottom part of the atomizer: 1. a circular orifice with a diameter of 0.94 mm and 2. an elliptical orifice with the major and minor axes of 2.03 and 0.67 mm, respectively. As discussed in our previous paper [14], for elliptical jets in crossflows, the aspect ratio (Ar) is typically defined as the ratio of the axis perpendicular to the crossflow direction, to the axis parallel to the crossflow direction (see Figure 2). In this case, both nozzles' shapes and orientations can be taken into account.…”

Dynamic mode decomposition of elliptical liquid jets in crossflow

“…The experimental facility in this study consists of an open loop subsonic wind tunnel with a test section of 100⨯100⨯750 mm, liquid injection system and an imaging system. A schematic of the experimental setup can be found in the work of (Jadidi et al 2019). A 1.5-HP blower fan made by Aeroflo is used to blow the ambient air into the wind tunnel.…”

“…This is also in line with the difference between the flow structures at the exit of circular and elliptical nozzles where obvious signs of turbulence could be seen for the elliptical nozzles. At constant Weber number and momentum flux ratios, increasing or decreasing AR could result in an increase of the average frequency and an inevitable reduction of wavelengths and the breakup lengths (Jadidi et al 2019). In case of the energy norms, the values of E are given in Table .1 for the circular jet and in Tables.2-3 for its elliptical counterparts.…”

“…Therefore, flow structures may be analyzed by decomposing them into modes using reduced order modelling (ROM) methods such as proper orthogonal decomposition (POD) (Holmes et al 2012), dynamic mode decomposition (DMD) (Rowley et al 2009), discrete Fourier transform (Holmes et al 2012), balancing modes for linear systems (Rowley 2005), global D r a f t eigenmodes for linearized dynamics (Bagheri et al 2009) and many other variants of these techniques. Recently, (Jadidi et al 2019) showed that the flow structures at the exit of circular and elliptical nozzles are different and the elliptical nozzles show more prominent signs of turbulence.…”