Dynamics of a full-cone atomizing liquid jet, PhD Defense, F. Franco Medrano
Channel: Fermin Franco
Date: 2016-07-20

"Dynamics of a full-cone atomizing liquid jet"
PhD Thesis Defense
Fermín Franco Medrano
Graduate Schoold of Mathematics, Kyushu University
Fukuoka, Japan, July 12th 2016

*** THIS VIDEO IS AN EXCERPT ***

Full texts and references: https://www.researchgate.net/profile/Fermin_Franco_Medrano2

ABSTRACT. We propose two-phase-fluid models for a turbulent full-cone high-speed atomizing liquid jet that describe its dynamics in a simple but comprehensive manner with the apex angle of the cone being the main disposable parameter. The basic assumptions are that (i) the jet is statistically stationary and that (ii) it can be approximated by a mixture of a liquid and a gas with its phases in dynamic equilibrium. To derive the models, we impose either total or partial conservation of the liquid mass and total power fluxes introducing mass and energy loss factors again as disposable as parameters. Our model equations admit analytical explicit or implicit  and numerical solutions for the composite density and velocity of the two-phase fluid, both as functions of the distance from the nozzle, from which the dynamic pressure and gas the entrainment rate coefficient are calculated. Assuming a far-field approximation, we theoretically derive a constant gas entrainment rate coefficient solely in terms of the cone angle. Moreover, we carry out experiments for a single-phase turbulent air jet and show that the predictions of our model compare well with this and other experimental data.