Simulation of a condensing aerosol in homogeneous isotropic turbulence

Amjad Alshaarawi, Antonio Attili, Fabrizio Bisetti

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The nucleation, growth, and coagulation of liquid droplets in three-dimensional homogeneous isotropic turbulence at Reλ ≈ 150 is simulated. Patches of dry and cold gas mix with patches of hot gas saturated with vapor of a condensable species, inducing nucleation of particles due to supersaturation. The simulation consists of a three-dimensional direct numerical simulation of homogeneous isotropic turbulence with a statistically stationary forced velocity field. All length and time scales of fluid motion and scalar mixing are resolved adequately. For the droplets phase, a model based on the quadrature method of moments and a Lagrangian scheme for the solution of the moment transport equations are employed. Results show that droplets form early in the evolution of the flow field and their concentration peaks on the cold side of the mixing layers separating the patches of hot and cold gas, where droplets nucleate most intensely. Conversely, the droplets grow most rapidly on the hot side of the mixing layers. As turbulent mixing displaces the droplets into regions of hot and moist gas, the droplets' size increases markedly. Conditional statistics of the aerosol phase in the mixture fraction space are employed to investigate this trend.

Original languageEnglish (US)
Title of host publication9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015
PublisherTSFP-9
Volume3
ISBN (Electronic)9780000000002
StatePublished - Jan 1 2015
Event9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015 - Melbourne, Australia
Duration: Jun 30 2015Jul 3 2015

Conference

Conference9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015
CountryAustralia
CityMelbourne
Period06/30/1507/3/15

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

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