화학공학소재연구정보센터
International Journal of Heat and Mass Transfer, Vol.44, No.20, 3833-3842, 2001
High Schmidt number mass transfer using Chapman-Kuhn's near wall coherent structure model
High Schmidt number mass transfer in a fully developed turbulent flow is examined using a near wall coherent structure model. The computational approach relies on specification of idealized boundary conditions in the form of a two eddy structure imposed at a distance of y(+) = 40 away from the wall. The parameters describing the spatial and temporal eddy behavior are obtained from a combination of experimental observation, analysis and computer trials as described by D.R. Chapman, G.D. Kuhn (AIAA Paper 81-1024 (1981) 306-316). Among these parameters, those describing the root mean square (rms) velocities in normal and spanwise directions are found to have significant influence on mass transfer at the wall. A correlation relating the mass transfer rate and the rms velocities is obtained. The effects of turbulence intensity on eddy viscosity and eddy diffusivity are also determined.