ARTICLE:

• NUMERICAL MODELLING OF TURBULENCE EFFECTS WITHIN AN EVAPORATING DROPLET IN ATOMIZING SPRAYS  download article

M. S. Balasubramanyam
University of Alabama, Huntsville, USA

C. P. Chen
Department of Chemical and Materials Engineering, University of Alabama in Huntsville, Huntsville, AL 35899, USA

H. P. Trinh
NASA-Marshall Space Flight Centre, Huntsville, USA

ABSTRACT

A new approach to account for finite thermal conductivity and turbulence effects within atomizing liquid sprays is presented in this paper. The model is an extension of the T-blob and T-TAB atomization/spray model of Trinh and Chen (2005). This finite conductivity model is based on the two-temperature film theory, where the turbulence characteristics of the droplet are used to estimate the effective thermal diffusivity within the droplet phase. Both one-way and two-way coupled calculations were performed to investigate the performance of this model. The current evaporation model is incorporated into the T-blob atomization model of Trinh and Chen (2005) and implemented in an existing CFD Eulerian-Lagrangian two-way coupling numerical scheme. Validation studies were carried out by comparing with available evaporating atomization spray experimental data in terms of jet penetration, temperature field, and droplet SMD distribution within the spray. Validation results indicate the superiority of the finite-conductivity model in low speed parallel flow evaporating spray.

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