Morphology-adaptive simulation of pool-scrubbing hydrodynamics

2024

Pool scrubbing is often used for removing harmful aerosol particles by injecting the gas mixture into a liquid pool [1], where hydrodynamics affects the decontamination factor significantly. The poolscrubbing bubble column is characterized by a large nozzle and high injection flow rates, which lead to large gas structures in the injection zone. As they rise up, these globules break up and form a swarm of small bubbles. The wide range of bubble size and shape poses a challenge for both two-fluid model (TFM) and interface-tracking approaches [2]. In this work, we apply the hybrid multi-field two-fluid model MultiMorph [3] to simulate a rectangular pool-scrubbing bubble column. The MultiMorph model considers the interaction between the gas and liquid according to the scale of the interfaces, applying a VOF-like treatment at the largescale interfaces and the conventional TFM to the small-scale ones. In this way, the description of the topology changes and regime transition is realized with the same set of equations. In the simulation, both the gas and liquid can be treated as either dispersed or continuous phases depending on the ratio between the particle (droplet or bubble in this work) size and the local cell size. The capability of the model is validated by comparing with experimental data from reference [4] as well as results obtained with the VOF and TFM, respectively. The MultiMorph model turns out to show significantly improved agreement with experimental data.

hybrid multi-field two-fluid; morphology transfer; multiMorph; OpenFOAM; Pool scrubbing; info:eu-repo/semantics/publishedVersion; doc-type:lecture; Text

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English

DERBS HZDR:PUBLDB:38162-1
1456321412

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