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Characterization of aggregation and declustering tendency of hydrophobic fine particles in water

机译：疏水细颗粒在水中聚集和降解趋势的特征

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摘要

When hydrophobic particles are added to water, they form clusters by interparticle gas bridging. The hydrostatic, capillary and buoyancy forces acting on the submerged clusters can gradually mobilize the interparticle gas bubbles. As particles are released from the cluster gradually, the cluster is transformed into slurry state. We studied the clustering and declustering characteristics of hydrophobic granular particles (dyed quartz sand with 0.33mm and 0.73mm in diameter), which were applied to the water surface and submerged after forming clusters. Behavior of the particle clusters was evaluated to characterize (1) clustering tendency of particles, and (2) gradual particle declustering by mobilization, coalescence and release of air bubbles from the submerged cluster. Cluster formation and declustering rates of the particles were evaluated based on the experimental data and observations. Clustering tendency of the particles depends on the surface tension characteristics (or spreading tendency) of the particles on the water surface. On the other hand, stability of the submerged cluster is highly dependent on the surface roughness which we proposeaffects the ability of the microbubbles to coalesce within the submerged cluster. Particle cohesion coefficient for clustering tendency and particle declustering rate for transformation of the submerged aggregate to slurry state were estimated from experimental data.
机译：当疏水颗粒加入水中时，它们通过颗粒气体桥接形成簇。作用在浸没簇上的静水压，毛细管和浮力力可以逐渐动动颗粒气泡。随着颗粒逐渐从簇中释放，簇将簇变成浆料状态。我们研究了疏水性粒状颗粒的聚类和转化特性（染色的石英砂，直径为0.33mm，0.73mm），其施用于水面并在形成簇后浸没。评价颗粒簇的行为以表征（1）颗粒的聚类趋势，并通过动员，聚结和浸没簇的气泡释放逐渐粒子降解。基于实验数据和观察评估颗粒的簇形成和颗粒的降价。颗粒的聚类趋势取决于水表面上颗粒的表面张力特性（或扩散趋势）。另一方面，浸没簇的稳定性高度依赖于我们将微泡能够在浸没式簇内聚结的能力的表面粗糙度。实验数据估计粒子内聚力和用于转化浸没骨料的粒子降解速率与浆料状态。

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