화학공학소재연구정보센터
AIChE Journal, Vol.40, No.1, 29-39, 1994
(U’v’)over-Bar Reynolds Stress in the Viscous Sublayer over a Wide-Range of Re Numbers
To test the ability of different turbulence models to-predict the turbulent momentum transport in the viscous sublayer, measurements are performed with a laser Doppler velocimeter (LDV). The main objective of the experiments is to measure the u’v’BAR correlation in the near wall region. The results support the correlation : -u’v’BAR = A(k)y+3 . The results of 2-D computer simulations using four different low Reynolds number k-epsilon turbulence models are compared with the experimental LDV data. The models tested are the original low Reynolds number k-epsilon model of Jones and Launder (1972, 1973) and three later modifications by Chien (1980), Lam and Bremhorst (1981), and Nagano and Hishida (1987). The u’v’BAR correlation was found to be underestimated with all four models, but the Chien model was superior, with only a 40% underestimation in the viscous sublayer.