Abstract: The problem of calculation of penetration range of oil in soil with different particle diameters could be molded by software CFD. It can build three-dimensional flow and mass coupling model with water-oil flowing separately in porous soil media. The simulation shows that oil diffuses in U shape in soil with bigger particles (0.5 mm and 0.221 mm); while it diffuses in egg shape in soil with smaller particles (0.147 mm and 0.098 mm); and oil diffuses in pear shape in soil with tiny particles (0.021 mm and 0.002 mm). The diffusion rate of oil in the six different soils is nearly same in the first minute; the rate increases gradually in five kinds soil with (0.5 mm-0.021 mm) different particle diameters in the next four minutes. The speed in 0.021 mm diameter soil is faster than that in soil of 0.5 mm by 12%. The diffusion rate is nearly same in soil of 0.021 mm diameter and 0.002 mm diameter.

Key words: Oil,    ,  Particle diameter,    ,  Diffusion area,    ,  Diffusion rate,    ,  Penetration,    ,  Leak

摘要： 针对油品在不同颗粒直径的土壤中渗透范围计算问题，借助CFD软件建立土壤多孔介质中油水两相流动的三维流动传质耦合模型。模拟结果表明，油品在0.5 mm和0.221 mm较大颗粒土壤中的泄漏范围是以U形区域扩散；在0.147 mm和0.098 mm较小颗粒土壤中以蛋状区域扩散；在0.021 mm和0.002 mm微小颗粒土壤中以鸭梨状区域扩散。油品泄漏1 min内，在6种土壤中的扩散速率几乎相同；泄漏1~5 min之间，颗粒在0.5 mm至0.021 mm依次减小的5种土壤中油品扩散速率逐渐增大，0.021 mm比0.5 mm土壤的扩散率高约12%；颗粒小于0.021 mm时，其与0.002 mm在相差近10倍的情况下，扩散速率几乎相同。

关键词: 油品 , 颗粒直径 , 扩散范围 , 扩散速率 , 渗透 , 泄漏