水环境中油滴上浮运动特性实验研究

韩龙喜; 蒋安祺; 王晨芳; 牛祥明; 赵金菁

doi:10.13205/j.hjgc.202406001

水环境中油滴上浮运动特性实验研究

doi: 10.13205/j.hjgc.202406001

1. 河海大学浅水湖泊综合治理与资源开发教育部重点实验室, 南京 210098;
2. 河海大学环境学院, 南京 210098

基金项目:

国家自然科学基金面上项目"事故溢油向环境水体扩散的动力学机理及数学模拟"(51979079)

详细信息

作者简介:
韩龙喜(1964-),男,教授,主要研究方向为环境水力学。hanlongxi@sina.com

通讯作者:
韩龙喜(1964-),男,教授,主要研究方向为环境水力学。hanlongxi@sina.com

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出版历程
- 收稿日期: 2023-02-24
- 网络出版日期: 2024-07-11

EXPERIMENTAL INVESTIGATION OF FLOATING MOTION CHARACTERISTICS OF OIL DROPLETS IN WATER

1. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake, Ministry of Education, Hohai University, Nanjing 210098, China;
2. College of Environment, Hohai University, Nanjing 210098, China

摘要

摘要: 油滴的上浮运动特性是水体中石油类污染物迁移转化特征研究的重要组成内容之一。对静止水体中单油滴的上浮运动过程进行研究,得到不同粒径油滴的运动轨迹、瞬时速度以及稳定状态下油滴的形状和终端速度,并分别分析了油滴粒径与形变程度、瞬时速度与运动轨迹、终端速度U_T与粒径d、阻力系数C_D和雷诺数Re之间的关系。研究发现,水体中油滴形状以圆球体和椭球体为主,形变随粒径增大而加剧,但整体形变程度较小;油滴运动轨迹随粒径增大由直线型逐渐向S形变化,且水平振荡幅度逐渐增大,但油滴水平振荡对油滴垂向速度的影响极小可忽略不计;U_T随油滴粒径增加逐渐增至峰值,通过峰值后,U_T轻微降低,而后趋于平稳;油滴C_D随Re增大呈先逐渐降低至稳定后迅速增大的变化趋势。同时,基于实验数据并结合Stokes定律拟合得到1组更为精准的适用于Re<2000时油滴的C_D—Re关系式。
- 油滴 /
- 形变 /
- 阻力系数 /
- 雷诺数 /
- 终端速度
Abstract: The floating motion characteristics of oil droplets are one of the important components in the study of migration and transformation characteristics of petroleum-based pollutants in water bodies. In this paper, the upward motion of a single oil droplet in a stationary water body was studied, and the trajectories, instantaneous velocities, shapes, and terminal velocities of oil droplets of different particle sizes were obtained, then the relationships between particle size and deformation degree, instantaneous velocity and trajectory, terminal velocity U_T and particle size d, drag coefficient C_D and Reynolds number Re were analyzed. It was found that the shape of oil droplets in the water body was mainly spherical and ellipsoidal, the deformation increased with the increase of particle size, but the overall deformation degree was low; the trajectory of oil droplets gradually changed from linear to S-shaped with increasing particle size, while the amplitude of horizontal oscillation gradually increased, but the effect of horizontal oscillation of oil droplets on the droplet vertical velocity can be negligible; the U_T gradually increased to the peak with the increase of oil droplet size, and after passing the peak, the U_T decreased slightly and then tended to be stable; the C_D-Re relationship tended to gradually decrease, stabilize and then rapidly increase. Meanwhile, based on the experimental data and combined with Stokes’ law, a set of C_D-Re relations for silicone oil droplets at Re<2000 was obtained.
- oil droplet /
- deformation /
- drag coefficient C_D /
- Reynolds number Re /
- terminal velocity U_T

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