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Title: Transient growth of droplet instabilities in a stream

Droplet deformation is the first stage of all aerodynamically induced-breakups, considerably affecting the characteristics of the atomization. In the present study, using an adaptive volume of fluid method, two and three-dimensional direct numerical simulations have been performed to understand droplet deformation. A high Reynolds number and a range of relatively high Weber numbers are chosen, addressing the shear breakup of droplets in a stream. The study is focused on the initiation and growth of instabilities over the droplet. The role of Kelvin-Helmholtz and Rayleigh-Taylor instabilities in wave formation and azimuthal transverse modulation are shown and the obtained results for the most amplified wave-numbers are compared with instability theories for zero and non-zero vorticity layers. The present results for the most amplified wave-numbers and deformation topologies are in good agreement with the previous experimental results.
Authors:
 [1] ;  [2]
  1. Department of Mechanical Engineering, The University of British Columbia, Vancouver, British Columbia V6T 1Z4 (Canada)
  2. School of Engineering, The University of British Columbia, Kelowna, British Columbia V1V 1V7 (Canada)
Publication Date:
OSTI Identifier:
22257021
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Fluids (1994); Journal Volume: 26; Journal Issue: 1; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COMPUTERIZED SIMULATION; DEFORMATION; DROPLETS; FLUIDS; MODULATION; RAYLEIGH-TAYLOR INSTABILITY; REYNOLDS NUMBER; SHEAR; STREAMS; TOPOLOGY; TRANSIENTS