Collision adhesion law of oil Droplets-Bubbles with different particle sizes in free floating

IF 2.8 2区工程技术 Q2 ENGINEERING, MECHANICAL

Experimental Thermal and Fluid Science Pub Date : 2024-08-13 DOI:10.1016/j.expthermflusci.2024.111292

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Abstract

The treatment of oily wastewater has become a serious problem in the late stage of oilfield development. At the same time, it is of great significance to the improvement of ecological environment. As the key process of oil-bearing wastewater treatment, the study on the binding and adhesion law of oil droplets and bubbles in flotation and its related mechanism can provide reference for its application. Using a double high-speed camera acquisition system, the floating process and collision adhesion law of oil droplets and bubbles in a vertical transparent circular tube were experimentally studied, and the collision adhesion process of oil droplets (0.721 ∼ 3.759 mm) and bubbles (0.797 ∼ 2.886 mm) in different diameters were analysed. It is concluded that the oil droplet and the bubble collide with each other, and then the bubble slides along the surface of the oil droplet, and a neck shape appears at the end of the contact site, and then the neck increases with the diffusion of the oil droplet to form an oil-bubble adhesion body. And the process of elastic drags and contraction separation of the mixture is also demonstrated. It is found that the combination of oil droplets and bubbles with different diameters will have two types of collision adhesion modes, which oil droplet type and oil film type, respectively. Therefore, the diameter ratio of oil droplets and bubbles is a key factor, and when the diameter ratio is greater than 0.75, the adhesion mode of the adhesive body changes from unstable oil droplet type to more stable oil film type.

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自由漂浮的不同粒径油滴-气泡的碰撞粘附定律

含油废水的处理已成为油田开发后期的一个严重问题。同时，对改善生态环境也具有重要意义。作为含油污水处理的关键工序，研究油滴和气泡在气浮过程中的结合、粘附规律及其相关机理，可为其应用提供参考。利用双高速摄像采集系统，实验研究了油滴和气泡在垂直透明圆管中的上浮过程和碰撞粘附规律，分析了不同直径油滴（0.721 ∼ 3.759 mm）和气泡（0.797 ∼ 2.886 mm）的碰撞粘附过程。结论是油滴与气泡碰撞后，气泡沿油滴表面滑动，在接触部位的末端出现颈部形状，然后颈部随着油滴的扩散而增大，形成油泡粘附体。同时还展示了混合物的弹性拖曳和收缩分离过程。研究发现，不同直径的油滴和气泡组合会产生两种碰撞粘附模式，分别是油滴型和油膜型。因此，油滴和气泡的直径比是一个关键因素，当直径比大于 0.75 时，粘合体的粘合模式将从不稳定的油滴型转变为更稳定的油膜型。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Experimental Thermal and Fluid Science 工程技术-工程：机械

CiteScore

6.70

自引率

3.10%

发文量

159

审稿时长

34 days

期刊介绍： Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.