Numerical investigation of the maximum erosion zone in elbows for liquid-particle flow

A unifying correlation for laminar particle deposition in 90-degree pipe bends

In order to improve the performance of the separation device, a novel kind of cyclone separator is designed. The effects of the structure parameters and operation parameters on pressure drop and separation efficiency are investigated based on orthogonal experimental through the test platform. In addition, the internal flow characteristics in the optimized swirl generator are investigated by numerical simulation. Accordingly, the pressure drop of the optimized swirl generator is 170.9 Pa and its separation efficiency is 68.23% when extraction ratio is 5%. The blade shape and the blade outlet angle can influence the pressure drop and efficiency. The diameter of guiding cone has influence on pressure drop, but has no influence on the efficiency. When the extraction ratio is increased to 10%, the efficiency could be raised to 79.97%, and it has no significant increase at higher extraction ratio. The separation efficiency can reach to 88.10% when it is used to separate 180–250 u m sand. Finally, the simulation reveals that the flow features and distribution in the optimized swirl generator. Therefore, the new-type cyclone separator, which is expected to be applied in separation fields, has great actual using value.

Orthogonal experimental design of an axial flow cyclone separator

Numerical study on characteristics of particle deposition efficiency on different walls of 90° square bend

The present study aims to investigate the effect of swirling flow on particle deposition in a realistic human airway. A computational fluid dynamic (CFD) model was utilized for the simulation of oral inhalation and particle transport patterns, considering the k-ω turbulence model. Lagrangian particle tracking was used to track the particles’ trajectories. A normal breathing condition (30 L/min) was applied, and two-micron particles were injected into the mouth, considering swirling flow to the oral inhalation airflow. Different cases were considered for releasing the particles, which evaluated the impacts of various parameters on the deposition efficiency (DE), including the swirl intensity, injection location and pattern of the particle. The work's novelty is applying several injection locations and diameters simultaneously. The results show that the swirling flow enhances the particle deposition efficiency (20–40%) versus no-swirl flow, especially in the mouth. However, releasing particles inside the mouth, or injecting them randomly with a smaller injection diameter (dinj) reduced DE in swirling flow condition, about 50 to 80%. Injecting particles inside the mouth can decrease DE by about 20%, and releasing particles with smaller dinj leads to 50% less DE in swirling flow. In conclusion, it is indicated that the airflow condition is an important parameter for a reliable drug delivery, and it is more beneficial to keep the inflow uniform and avoid swirling flow.

Effect of swirling flow and particle-release pattern on drug delivery to human tracheobronchial airways

Numerical study on deposition of particles in a 90° bend in the presence of swirling flow using Eulerian-Lagrangian method

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Numerical study on deposition of particles in a 90° bend in the presence of swirling flow using Eulerian-Lagrangian method