Effect of additional heat transfer modes on measured evaporation and combustion rates of isolated hydrocarbon droplets

Muelas, Álvaro (Universidad de Zaragoza) ; Poonawala, Taha (Universidad de Zaragoza) ; Ballester, Javier (Universidad de Zaragoza)

Resumen: This work addresses the impact of different additional heat transfer modes on the evaporation behaviors extracted from single droplet experiments. Conduction of heat through the support filaments, absorption of radiation and external convective effects can induce significant deviations from the targeted canonical problem, where the only heat transfer mode is usually assumed to be conduction through the droplet-gas interface. When these additional modes are not duly accounted for, those deviations should be considered as experimental artifacts. This work is an extension of a previous study describing a theoretical framework to estimate the magnitude of each experimental artifact by means of dimensionless numbers. Whereas the method had been validated with high-temperature evaporation data obtained for alcohols droplets, this assessment is now extended to cover situations of practical relevance including hydrocarbon fuels (dodecane and Jet A) vaporizing under both oxygen-free and oxidizing atmospheres. Results from a total of 352 tests support the use of the proposed method also for hydrocarbons and droplet combustion scenarios, allowing for an inexpensive estimation of the different experimental artifacts in single droplet tests, as required for the correct interpretation of droplet evaporation/combustion experimental data.

Idioma: Inglés

DOI: 10.1016/j.combustflame.2024.113956

Año: 2025

Publicado en: Combustion and Flame 273 (2025), 113956 [5 pp.]
ISSN: 0010-2180

Financiación: info:eu-repo/grantAgreement/ES/AEI/PID2022-140620OB-I00
Financiación: info:eu-repo/grantAgreement/ES/MICINN PRE2020-094620

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Mecánica de Fluidos (Dpto. Ciencia Tecnol.Mater.Fl.)