Numerical simulation of bubble dynamics and segregation in binary heptane/dodecane mixtures

  • A mathematical model for the simulation of spherical bubble dynamics in binary alkane mixtures is presented. Detailed heat and mass transfer and phase transition are resolved, and air absorption and desorption are considered. As example mixtures, high-volatile heptane and low-volatile dodecane are investigated. The low-volatile component shows a convective counter-intuitive mass transport opposite to the diffusion flux. A staggered mass flux of heptane and dodecane is associated with a local segregation of mixture components in the surrounding liquid and a distinctive species distribution within the bubble. A comparative study with a pseudo-fluid where alkane species interdiffusion is absent and whose components cannot segregate reveals that for an oscillating bubble, the local segregation hardly affects bubble dynamics, while for a continuously growing bubble in a superheated liquid, the growth rate is considerably affected, particularly for a low heptane mixture percentage. This study demonstrates limitations of treating mixtures by a single-component surrogate fluid and may serve as a starting point for the development of multi-component cavitation models for computational fluid dynamics applications in real fluid mixtures as, e.g. fuels or hydraulic oils.

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Author:Jean M. Bermudez-GraterolORCiDGND, Romuald SkodaORCiDGND
Parent Title (English):Journal of fluid mechanics
Publisher:Cambridge University Press
Place of publication:Cambridge
Document Type:Article
Date of Publication (online):2024/01/18
Date of first Publication:2022/08/17
Publishing Institution:Ruhr-Universität Bochum, Universitätsbibliothek
Tag:bubble dynamics; cavitation
Issue:Artikel A9
First Page:A9-1
Last Page:A9-39
Institutes/Facilities:Institut für Thermo- und Fluiddynamik, Hydraulische Strömungsmaschinen
open_access (DINI-Set):open_access
faculties:Fakultät für Maschinenbau
Licence (English):License LogoCreative Commons - CC BY 4.0 - Attribution 4.0 International