Premium
Turbulence structure and scalar transfer in stratified free–surface flows
Author(s) -
Nagaosa Ryuichi,
Saito Takayuki
Publication year - 1997
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690431003
Subject(s) - turbulence , free surface , mechanics , scalar (mathematics) , physics , boundary layer , classical mechanics , heat transfer , k epsilon turbulence model , direct numerical simulation , stratified flow , geometry , mathematics , reynolds number
Abstract Direct numerical simulations were used to investigate turbulence structure and scalar transfer across a shear‐free, nonwavy gas‐liquid interface (free surface) in stably stratified turbulent flows. These simulations solve the Navier–Stokes and thermal‐energy conservation equations, using a finite difference approximation. The relation between the turbulence structure in the stably stratified turbulent boundary layer and organized motion near the free surface are discussed. In addition, scalar transfer across a free surface is investigated by solving a passive scalcr conservation equation after both velocity and temperature fields are fully developed. The effects of stable stratification on the scalar transfer process in a region very close to the free surface are also discussed.