Bulletin of the American Physical Society
77th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 24–26, 2024; Salt Lake City, Utah
Session A09: Drops: Heat Transfer, Evaporation and Buoyancy Effects I
8:00 AM–10:10 AM,
Sunday, November 24, 2024
Room: Ballroom I
Chair: James Bird, Boston University
Abstract: A09.00009 : A three component model for the shell formation stage for the combustion of a polymer infused fuel droplet
9:44 AM–9:57 AM
Presenter:
Rimjhim Spandan
(Indian Institute of Science)
Authors:
Rimjhim Spandan
(Indian Institute of Science)
Pratikash Panda
(Indian Institute of Science)
Ravikrishna Rayavarapu
(Indian Institute of Science)
A polymer infused fuel droplet has three main components: fuel, polymer (gellant), and a solvent for dissolving the gellant. The combustion dynamics of the drop depend on the boiling points and the evaporation rates of the fuel and the solvent, as the gellant typically burns last.
The combustion of a single such drop ( here, ethanol as the fuel, water as the solvent, HPMC as the polymeric gellant, with the boiling point of the fuel less than that of the solvent) can be broadly classified into shell formation, vapour jetting events, and burning of the gellant.
In this study, we assume the shell formation to be predominantly governed by the diffusion of the gellant due to a concentration gradient caused by the rapid evaporation of the solvent from the droplet surface. Droplet combustion till shell formation is modelled by tracking the gellant concentration inside the droplet, using a three component, one dimensional spherical diffusion model. Numerical solution of the resulting equations show a good match with the experimental results.
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