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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

Multicomponent Evaporation Effects on Particulate Release in a Liquid Fuel Fire

Flint Pierce
Sandia National Laboratories, PO Box 5800, Albuquerque, NM, 87185-1136, USA

Alexander L. Brown
Sandia National Laboratories, PO Box 5800, Albuquerque, NM, 87185-1136, USA

David L.Y. Louie
Sandia National Laboratories, PO Box 5800, Albuquerque, NM, 87185-1136, USA

Ethan T. Zepper
Fire Science & Technology Dept., Sandia National Laboratories, PO Box 5800, Albuquerque, NM, 87185-1136, USA

Abstract

In fire scenarios where hazardous chemicals or radiological materials are present, the dispersal of these contaminants is of paramount importance due to the risks of exposure or inhalation posed to individuals that come in contact with them. This is especially true when those species remain in the solid phase as particulates of micron size or smaller. Here we revisit a 2015 study by Brown and Louie [1] that focused on entrainment of a contaminant species in liquid droplets produced at a boiling fuel/air interface. We have recently added the ability to model multi-component droplets to Sierra Low Mach module Fuego [2], the CFD code used in this study. Using this new capability, individual droplet components can evaporate independently or remain inert based on their material properties and coupling to the local fluid environment. The previous study used non-evaporating, inertial, heated droplets and calculated the contaminant transport through a knowledge of the contaminant mass fraction in each droplet. The addition of this new physics provides greater insight into the evolution of a multi-component droplet from their production to evaporation to eventual collision with either the source pool, container walls, or escape boundary. This allows us to more accurately determine the fate of contaminants in these scenarios.

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