Influence of Injection Distance on Water Droplet Behavior in High Pressure Descaling

Tamura, Yasutaka; Ueoka, Satoshi; Kimura, Yukio; Kabeya, Kazuhisa

doi:10.2355/isijinternational.isijint-2019-070

Cited by 9 publications

(5 citation statements)

References 11 publications

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“…Many scholars give their contribution to this issue. Gao Feng compared and analyzed the velocity distributions and impingement pressures on targets for four nozzles [2];Yuta Tamura studied high-pressure descaling nozzles and derived relationships among injection pressure, flow rate, and velocity [3]; Rong Xue analyzed the characteristics of internal and external flow of liquid nitrogen spray with multi-nozzle, and concluded higher injection pressure results in greater mass flow rate [4]; Urazmetov O investigated the relationship between nozzle geometry and fluid flow phenomena [5]. However, there has been a few research on the layout of center-type multi-nozzle for plane cleaning equipment.…”

Section: Introductionmentioning

confidence: 99%

Layout optimization design of circumferential arrangement nozzles for a plane cleaning equipment

Wang,

Zhang,

Zhang

et al. 2023

Ninth International Conference on Mechanical Engineering, Materials, and Automation Technology (MMEAT 2023)

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Multi-nozzle plane cleaning equipment is widely used in water jet cleaning technologies, which has the advantages of higher cleaning efficiency, better cleaning effect, and saving more labor and time. Currently, the nozzle layout of multi-nozzle plane cleaning equipment is mostly circumferential arranged and is adopted as the research object in this paper. Simulation optimization analysis is conducted on the parameters of multi-nozzle plane layout and its dynamic pressure cloud map and water phase volume fraction cloud map are obtained. Orthogonal experimental optimization method is applied with cleaning indicators as optimization objectives, and then the layout of multi-nozzle plane is optimized. The optimal layout states that the equipment should have 7 nozzles, the nozzle space and the nozzle target distance should be 16 mm and 110 mm, respectively. The research results provide a reference basis for the study of multi-nozzle plane layout parameters and a theoretical basis for the design of multi-nozzle cleaning equipment.

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Section: Introductionmentioning

confidence: 99%

Layout optimization design of circumferential arrangement nozzles for a plane cleaning equipment

Wang,

Zhang,

Zhang

et al. 2023

Ninth International Conference on Mechanical Engineering, Materials, and Automation Technology (MMEAT 2023)

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“…This setting can result in uneven descaling of the surface and residual scales. However, most papers present results with a single nozzle test [6,7,11,15,16] or without considering the interaction between multiple jets [8]. Research at the Brno University of Technology also focuses on the interaction between multiple water jets using various types of experiments such as impact pressure distribution measurement, erosion test, hot descaling test, and heat transfer measurement because the interaction area was found to be critical for the quality of descaling [17].…”

Section: Introductionmentioning

confidence: 99%

“…Much work has been done in the field of mathematical modeling of single droplets [21,22] and metal forming [23]. The studies of high-pressure (high-velocity) water jets have shown that the assumption of single droplets is typically far from reality and that the jet consists of water clusters or bunches [15,24]. As presented in [25], using scanning electron microscopy, water droplets cause erosion differently from erosion caused by water clusters or bunches.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Water Jet Overlaps in a Descaler on the Quality of Surface of the Hot Rolled Steel

Pohanka,

Votavová,

Resl

et al. 2023

Metals

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Hot rolling is a highly efficient steel processing method involving the heating and subsequent rolling of semi-finished cast products within mills; however, heating results in the formation of an undesirable, inhomogeneous oxide layer on the surface. Removal of this layer, known as scales, prior to rolling is essential to prevent scales from being rolled into the surface. The scales are removed in the descaler. Most descalers use multiple high-pressure hydraulic descaling nozzles with overlapping sprays. This setting can cause excessive cooling in the overlap area, uneven descaling of the surface, and the presence of residual scales. It can also result in uneven cooling at the finishing line. This study illustrates a typical nozzle configuration commonly used in industrial plants in the hydraulic descaling process and compares its results with a new configuration. The research focuses on examining the overlap area and the washout area of the sprays. The goal is to address the inhomogeneous descaling problem and propose procedures to prevent residual scales. It was shown that one of the problematic areas is the washout area, where the average thickness of the remaining scales was more than four times higher than other descaling areas. Reducing the offset angle has proven to be a good way to eliminate the washout area and achieve a homogeneous descaling process.

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“…Finally, a seven mm thick anti-rust layer is formed on the surface of the metal substrate. This method is not suitable for cold rolling, deep drawing and rotary deep drawing (Tamura et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Effect of oxide scale structure on shot-blasting of hot-rolled strip steel

Wang

Yang

et al. 2020

PeerJ Materials Science

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Background The effect of oxide scale composition of hot-rolled strip (Q235) on shot blasting is studied in this article. The properties of the oxide scale on the strip surface change during storage. The shot blasting is an important on-line acid-less descaling technology. The effect of shot blasting is affected by many factors, among which the composition of oxide scale may play an important role. However, there are few studies on the relationship between the oxide layer content and the descaling effect. Methods The morphologies of oxide scales at different storage times are observed by scanning electron microscopy (SEM), and the compositions are analyzed by X-ray diffraction. These strips are then shot blasted and descaled with different amounts of abrasive, and the descaling effects are compared by SEM. Results The results show that the eutectoid structure Fe3O4/Fe in the oxide scale will gradually transform into Fe3O4. In the case of short storage time, the content of the eutectoid structure is high, and it is difficult to remove the oxide scale. While the strip with a long storage time has no eutectoid structure Fe3O4/Fe and FeO, it is easy to remove the oxide scale during the shot blasting process. The composition of the oxide scale has a significant effect on the effect of shot blasting, and it provides significant guidance to the optimization of the descaling process parameters.

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Influence of Injection Distance on Water Droplet Behavior in High Pressure Descaling

Cited by 9 publications

References 11 publications

Layout optimization design of circumferential arrangement nozzles for a plane cleaning equipment

Layout optimization design of circumferential arrangement nozzles for a plane cleaning equipment

The Effect of Water Jet Overlaps in a Descaler on the Quality of Surface of the Hot Rolled Steel

Effect of oxide scale structure on shot-blasting of hot-rolled strip steel

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