成層密度流の流れの構造に関する研究

Abstract

Shear stress coefficient at interface, mixing lengths and diffusion coefficient are discussed ina density stratified shear flow.The equation of the shear stress coefficient is derived theoretically from equations of con-tinuity, mass and momentum conservations.Mixing lengths for momentum and mass or heat are discussed, based on the acceleration balanceequation and some integral methods. The theoretical methods to predict these mixing lengthsare developed. According to the theories, stabilizing effects of density stratification is more inmixing length for mass or heat than in that for momentum.Turbulent diffusion coefficient for mass or heat is discussed, and the theory is developed.These theories presented in this study show good agreements with the experimental results.