首页|Experimental and numerical studies on the cavitation in an advanced rotational hydrodynamic cavitation reactor for water treatment

Experimental and numerical studies on the cavitation in an advanced rotational hydrodynamic cavitation reactor for water treatment

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  • NSTL
  • Elsevier
Hydrodynamic cavitation (HC) has emerged as one of the most potential technologies for industrial-scale water treatment. The advanced rotational hydrodynamic cavitation reactors (ARHCRs) that appeared recently have shown their high effectiveness and economical efficiency compared with conventional devices. For the interaction-type ARHCRs where cavitation is generated from the interaction between the cavitation generation units (CGUs) located on the rotor and the stator, their flow field, cavitation generation mechanism, and interaction process are still not well defined. The present study experimentally and numerically investigated the cavitation flow characteristics in a representative interaction-type ARHCR which has been proposed in the past. The cavitation generation mechanism and development process, which was categorized into "coinciding", "leaving", and "approaching" stages, were analyzed explicitly with experimental flow visualization and computational fluid dynamics (CFD) simulations. The changes in the cavitation pattern, area ratio, and sheet cavitation length showed high periodicity with a period of 0.5 ms/cycle at a rotational speed of 3,600 rpm in the flow visualization. The experimental and CFD results indicated that sheet cavitation can be generated on the downstream sides of both the moving and the static CGUs. The sheet cavitation was induced and continuously enlarged in the "leaving" and "approaching" stages and was crushed after the moving CGUs coincided with the static CGUs. In addition, vortex cavitation was formed in the vortex center of each CGU due to high-speed rotating fluid motion. The shape and size of the vortex cavitation were determined by the compression effect produced by the interaction. The findings of this work are important for the fundamental understanding, design, and application of the ARHCRs in water treatment.

Hydrodynamic cavitation reactorCavitation generation mechanism and development processNumerical simulationExperimental flow visualizationWater treatment

Xuan, Xiaoxu、Song, Yongxing、Jia, Xiaoqi、Ji, Li、Zhao, Shan、Yoon, Joon Yong、Chen, Songying、Liu, Jingting、Wang, Guichao、Sun, Xun

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Shandong Univ, Sch Mech Engn, Key Lab High Efficiency & Clean Mech Mfg, Minist Educ, Jinan 250061, Peoples R China

Shandong Jianzhu Univ, Sch Thermal Engn, Jinan 250061, Peoples R China

Zhejiang Sci Tech Univ, Natl Prov Joint Engn Lab Fluid Transmiss Syst Tec, Hangzhou 310018, Peoples R China

Shandong Univ, Sch Environm Sci & Engn, Shandong Key Lab Water Pollut Control & Resource, Qingdao 266237, Peoples R China

Hanyang Univ, Dept Mech Engn, Ansan 15588, South Korea

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2021

10.1016/j.ultsonch.2020.105311

Ultrasonics sonochemistry

Ultrasonics sonochemistry

CCREI
ISSN：1350-4177
年,卷(期)：2021.70
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