油・処理剤混合物の垂直方向拡散

概要

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In this paper, turbulent vertical diffusion of oil particles due to waves, after dispersion of oil spilt on the sea by oil solvent, is investigated. Considering that vertical diffusion coefficient diminishs exponentially with depth, and that the dispersed particles rise owing to buoyancy, the following theoretical formula of concentration distribution is obtained, C=-(_kQ/Ei(-b/_KD_0)) exp(-b/_kD) where D=D_0exp(-KZ) is the vertical disffusion coefficient, z is the depth, b is the updraft velocity, Q is the volume sprinkled per unit area on the sea, -Ei(-x) is the integral exponential function. The vertical diffusion coefficients are calculated from data of hot film anemometer and wave height meter, the updraft velocity from the particle radius, and the concentration is measured by using COD (chemical oxigen demand) method. The agreement between the experiment and the theory is excellent. Further, transient diffusion process is investigated theoretically and time constant is calculated.
独立行政法人海上技術安全研究所の論文
1977-11-30