| Citation: | NIE Dongqiang, HUANG Xuezhang, SUN Zhiqianget al. Collision and attachment behavior between rising bubble and plastic plate in pure water[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(8): 1569-1574. doi: 10.13700/j.bh.1001-5965.2018.0708(in Chinese)
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In order to reveal the influence of bubble size and surface hydrophobicity on the flotation process of plastics, high-speed photography was used to observe the collision and adhesion behavior of rising bubbles and plastic plates in pure water medium. According to the change of bubble velocity, it is divided into three stages:collision, liquid film drainage and three-phase contact line diffusion. Based on image processing technology, the bubble collision deformation, adhesion time, three-phase contact line diffusion characteristics and their effects are quantitatively analyzed. The results show that the deformation factor gradually evolves from slightly larger than 1.00 to slightly less than 1.00 as the diameter of the bubble increases. The hydrophobic plate with strong hydrophobicity makes the deformation factor of the same diameter bubble larger, and the collision time increases with the increase of the bubble diameter, but decreases with the increase of the hydrophobicity. The stronger the hydrophobicity of the plastic plate is, the shorter the time it takes to form a three-phase contact. When the bubble diameter is 1.0mm, the liquid film discharge time of both the poly tetra fluoroethylene (PTFE) and polymethyl methacrylate (PMMA) plates is extremely small, which are 4.8 ms and 56 ms respectively. The diffusion time of the three-phase contact line increases with the increase of the bubble size, and decreases with the increase of the hydrophobicity of the plate. When the bubble size is the same, the diffusion diameter of the three-phase contact line decreases as the hydrophobicity of the plate decreases.
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