Numerical investigation of a perturbed swirling annular two-phase jet

Siamas, George A. and Jiang, Xi and Wrobel, Luiz C. (2009) Numerical investigation of a perturbed swirling annular two-phase jet. International Journal of Heat and Fluid Flow, 30 (3). pp. 481-493. ISSN 0142-727X

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Abstract

A swirling annular gas-liquid two-phase jet flow system has been investigated by solving the compressible, time-dependent, non-dimensional Navier-Stokes equations using highly accurate numerical methods. The mathematical formulation for the flow system is based on an Eulerian approach with mixed-fluid treatment while an adjusted volume of fluid method is utilised to account for the gas compressibility. Surface tension effects are captured by a continuum surface force model. Swirling motion is applied at the inlet while a small helical perturbation is also applied to initiate the instability. Three-dimensional spatial direct numerical simulation has been performed with parallelisation of the code based on domain decomposition. The results show that the flow is characterised by a geometrical recirculation zone adjacent to the nozzle exit and by a central recirculation zone further downstream. Swirl enhances the flow instability and vorticity and promotes liquid dispersion in the cross-stream wise directions. A dynamic precessing vortex core is developed demonstrating that the growth of such a vortex in annular configurations can be initiated even at low swirl numbers, in agreement with experimental findings. Analysis of the averaged results revealed the existence of a geometrical recirculation zone and a swirl induced central recirculation zone in the flow field.

Item Type:
Journal Article
Journal or Publication Title:
International Journal of Heat and Fluid Flow
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3104
Subjects:
ID Code:
51177
Deposited By:
Deposited On:
21 Nov 2011 10:23
Refereed?:
Yes
Published?:
Published
Last Modified:
09 Sep 2020 01:18