GROWTH OF ZERO-MEAN-SHEAR TURBULENT-MIXED LAYER WITH SUSPENDED PARTICLES IN A TWO-LAYER FLUID SYSTEM

摘要

The growth behaviour of zero--mean-shear turbulent--mixed layer containing suspendedsolid particles has been studied experimentally and analysed theoretically in a two-layer fluidsystem. The potential model for estimating the turbulent entrainment rate of the mixedlayer has also been suggested, including the results of the turbulent entrainment for pure two-layer fluid. The experimental results show that the entrainment behaviour of a mixedlayer with the suspended particles is well described by the model. The relationshipbetween the entrainment distance and the time, and the variation of the dimensionlessentrainment rate E with the local Richardson number Ri₁ for the suspended particles differfrom that for the pure two--layer fluid by the factors μ-1/5and μ-1, respectively, where μ=1+σ₀Δρ/Δρ₀.