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A computational study of droplet evaporation with fuel vapor jet ejection induced by localized heat sources

Published on May 1, 2015in Physics of Fluids2.627
· DOI :10.1063/1.4919809
Jaeheon Sim5
Estimated H-index: 5
(KAUST: King Abdullah University of Science and Technology),
Hong G. Im28
Estimated H-index: 28
(KAUST: King Abdullah University of Science and Technology),
Suk Ho Chung42
Estimated H-index: 42
(KAUST: King Abdullah University of Science and Technology)
Abstract
Droplet evaporation by a localized heat source under microgravity conditions was numerically investigated in an attempt to understand the mechanism of the fuel vapor jet ejection, which was observed experimentally during the flame spread through a droplet array. An Eulerian-Lagrangian method was implemented with a temperature-dependent surface tension model and a local phase change model in order to effectively capture the interfacial dynamics between liquid droplet and surrounding air. It was found that the surface tension gradient caused by the temperature variation within the droplet creates a thermo-capillary effect, known as the Marangoni effect, creating an internal flow circulation and outer shear flow which drives the fuel vapor into a tail jet. A parametric study demonstrated that the Marangoni effect is indeed significant at realistic droplet combustion conditions, resulting in a higher evaporation constant. A modified Marangoni number was derived in order to represent the surface force characte...
  • References (33)
  • Citations (2)
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References33
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SUMMARY Understanding the interfacial dynamics and fluid physics associated with the operation of spacecraft is important for scientific as well as engineering purposes. To help address the issues associated with moving boundaries, interfacial dynamics, and spatial-temporal variations in time and length scales, a 3-D adaptive Eulerian–Lagrangian method is extended and further developed. The stationary (Eulerian) Cartesian grid is adopted to resolve the fluid flow, and the marker-based triangulat...
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#1Minkuk Kim (KAUST: King Abdullah University of Science and Technology)H-Index: 2
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Abstract The effect of electric fields on the characteristics of flame spread over insulated electrical wire has been investigated experimentally by varying AC voltage and frequency applied to the wire in the normal gravity condition. The polyethylene (PE) insulated electrical wire was placed horizontally on electrically non-conducting posts and one end of the wire was connected to the high voltage terminal. Thus, the electrical system is the single electrode configuration. The wire was ignited ...
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Multiphase flows involving moving interfaces between different fluids/phases are observed in nature as well as in a wide range of engineering applications. With the recent development of high-fidelity computational techniques, a number of challenging multiphase flow problems around complex solid geometries can now be computed. We introduce the basic notion of the main categories of multiphase flow computational techniques and address issues arising from interface evolution in time with shape/top...
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Abstract A new droplet-array generation technique achieved high quality and high reliability in microgravity experiments on multiple-droplet combustion. Each fuel droplet formed at the intersection of fine, X-shaped SiC fibers when liquid fuel was supplied through a fine glass tube. We aligned several sets of these X-shaped fibers and their corresponding fine glass tubes to form a droplet array. All the droplets in the array were simultaneously generated in a short time. In flame-spread experime...
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A new moving staggered mesh discretization for the numerical simulation of incompressible flow problems involving free-surfaces is presented. The method uses the staggered mesh to obtain speed and conservation properties. Mesh motion provides a high quality mesh in the interior and cetailed resolution of the free-surface motion on the surface. Mesh flipping allows for optimal mesh connectivity to be maintained. The method uses an exact projection procedure which reduces the number of unknowns as...
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