%0 Journal Article
%@ 1070-6631
%A Revuelta Bayod, Antonio
%A Sánchez Pérez, Antonio Luis
%A Liñán Martínez, Amable
%D 2004
%F upm:872
%J Physics of Fluids
%K approximation theory; integration; jets; laminar flow; stratified flow; swirling flow; vortices; quasicylindrical description; submerged laminar swirling jets; emerging flow structure; swirling motion; adverse pressure gradient; momentum flux; annular structure; vortex breakdown;
%N 3
%P 848-851
%T The quasi-cylindrical description of submerged laminar swirling jets
%U https://oa.upm.es/872/
%V 16
%X TThe quasi-cylindrical approximation is used to describe numerically the structure of a submerged swirling jet for subcritical values of the swirl ratio S<Sc . The emerging flow structure is affected by the swirling motion, which enhances the entrainment rate of the jet and induces an adverse pressure gradient that reduces its momentum flux. The effect is more pronounced as the swirl ratio S is increased, yielding for sufficiently large values of S a jet with an annular structure. The integration describes the smooth transition towards the far-field self-similar solution for all values of S smaller than a critical value S5Sc , at which the numerical integration fails to converge at a given downstream location. The comparisons with previous experimental results confirm the correspondence between the onset of vortex breakdown and the failure of the quasi-cylindrical approximation.