Condensation-induced flow structure modifications in turbulent channel flow investigated in direct numerical simulations
Abstract
The turbulent flow of a fluid carrying trace amounts of a condensable species through a differentially cooled vertical channel geometry is simulated using single-phase direct numerical simulations. The release of latent heat during condensation is modeled by interdependent temperature and vapor concentration source terms governing the relation between the removal of excess vapor from the system and the associated local increase in fluid temperature. A coupling between condensation and turbulence is implemented via solutal and thermal buoyancy. When compared to simulations of an identical system without phase transition modeling, the modifications of the subcooled boundary layer due to the transient and highly localized release of latent heat could be observed. A separate analysis of fluid before and after phase transition events shows a clear increase in post-interaction streak spacing, with the release of latent heat during condensation events opposing the cooling effect of the channel wall and the associated damping of turbulence.
Keywords
Cite
@article{arxiv.1909.10746,
title = {Condensation-induced flow structure modifications in turbulent channel flow investigated in direct numerical simulations},
author = {Philipp Bahavar and Claus Wagner},
journal= {arXiv preprint arXiv:1909.10746},
year = {2020}
}
Comments
19 pages, 17 figures. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Physics of Fluids 32, 015115 (2020) and may be found at https://aip.scitation.org/doi/10.1063/1.5128976