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Separation Characteristics of Oil Droplets in a Shallow-Layer Countercurrent Flow Field with a Conical Disc-Stack Structure
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J
王
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DOI：10.1021/acs.iecr.6c00451.png)
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Abstract
En 中文
Shallow-layer separation is an effective approach for improving oil–water separation efficiency in produced-water treatment systems. However, the separation characteristics and hydrodynamic mechanisms in conical disc-stack countercurrent shallow-layer channels remain insufficiently understood. In this study, oil-droplet transport behavior and separation performance in a vertical conical disc-stack shallow-layer system were investigated through a combination of computational fluid dynamics (CFD) simulations, visualized experiments, and theoretical analysis. The internal flow field exhibits pronounced radial velocity gradients and anisotropic distribution, which induce interlayer flow maldistribution and droplet back-mixing, thereby significantly influencing the separation efficiency. Based on force balance and hydraulic residence time analyses, a theoretical plate length model was developed to quantitatively describe the separation process in the conical shallow-layer channel. The model was validated using both numerical and experimental results and was further evaluated for oil-droplet sizes ranging from 10 to 100 μm. The results indicate that the separation process can be divided into three characteristic regions: a chaotic region dominated by velocity fluctuations, a separation region governed by buoyancy–hydrodynamic coupling, and a clarification region characterized by stabilized flow. Theoretical predictions show good agreement with numerical simulations for intermediate droplet sizes (30–70 μm). This study provides a physically based and size-dependent framework for predicting separation performance and guiding the design and optimization of conical disc-stack shallow-layer systems in produced-water treatment applications.
Keywords:
Computer simulations
Genetics
Lipids
Liquids
Separation science
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