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Characterization of High Pressure Water Descaling Jets for Slabs Based on Different Shape Factors

Bowen Yang Guangqiang Liu Chengcheng Xu Kun Liu Peng Han
Archives of Foundry Engineering | 2024 | vol. 24 | No 1 | 121-128 | DOI: 10.24425/afe.2024.149259
Keywords High pressure water Descaling nozzle External jet Conical grooving
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Abstract

The surface temperature of steel billets during hot rolling can reach up to 1200 °C. High temperature promotes rapid oxidation of the surface of steel billets, forming a dense oxide layer similar to fish scales. If not removed in a timely manner, it will damage the surface of the steel billets and exacerbate the wear of the rolls during the descaling process. There are many methods for descaling, but high-pressure water jet has become the main method for descaling due to its excellent descaling performance, low cost, and ease of use. The tip of the descaling nozzle serves as the main component, and its structural parameters affect the final descaling effect. This research changes the shape factor of the nozzle groove curve and the diameter of the nozzle throat, and performs computational fluid dynamics (CFD) simulations on the simplified nozzle external flow field. The axial velocity at the center of the jet generates a velocity peak at 0.5-1 Dc. The peak velocity increases with the increase of shape factor and throat diameter, and the influence of shape factor on the peak velocity is greater. For a constant target distance, the length of the velocity stable section along the jet impact line increases with the increase of the shape factor. The maximum value of dynamic pressure increases, and the smaller the target distance, the greater the dynamic pressure difference. The trend of water volume is roughly the same as that of dynamic pressure.
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Bibliography

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Authors and Affiliations

Bowen Yang
1
Guangqiang Liu
2
Chengcheng Xu
3
Kun Liu
1
ORCID: ORCID
Peng Han
1
  1. School of Materials and Metallurgy, University of Science and Technology Liaoning, China
  2. School of Civil Engineering, University of Science and Technology Liaoning, China
  3. Cold Rolling Mill Plant, ANGANG Steel Company Limited, China

Rock Breaking Mechanism and Process Optimisation of Jet Cutting Basic Roof Rock under Submerged Jet Condition

Lei Shi Weiyong Lu Dong Lv
Archives of Mining Sciences | 2024 | vol. 69 | No 1 | 115-125 | DOI: 10.24425/ams.2024.149831
Keywords Turbulence effect Multi physical field simulation Fluid solid coupling High pressure water jet
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Abstract

The destruction of rock under the condition of a close submerged jet has become a hot topic of scientific research and engineering application in the past decade. With the unremitting efforts of a large number of experts and scholars around the world, gratifying progress has been made in the research of computational fluid dynamics (CFD) on the internal and external flow fields of the jet nozzle, the theoretical derivation of rock mechanics on the fracture initiation and propagation criteria of hydraulic fracturing, and the numerical simulation of jet erosion mechanism under the coupling of fluid and solid fields, however, for the rock mechanics hydraulic fracturing cutting engineering scale of non-oil drilling fracturing technology, the research on the fluid-solid coupling boundary conditions of fracturing fluid and hard dense rock under the flow state conditions of the submerged field inside and outside the borehole is not sufficient. In the calculation of the fluid-solid coupling boundary flow field under the non-submerged jet state, the control equation with Reynolds number between 2300-4000 shall be selected, while it belongs to the laminar flow state in the stage of hole sealing and pressurised fracturing. Therefore, Von-Mises equivalent plastic stress is selected in the mechanical model to calibrate the failure state of the rock-solid boundary, and the control equations of laminar flow and turbulent flow are selected to calibrate the fluid boundary. The mechanism of different stages of rock breaking by hydraulic fracturing jet can be further analysed in detail, and Comsol 6.0 multi-physical field simulation software is selected for verification. The research results will help deepen the understanding of rock breaking mechanism by jet and optimise the selection of parameters for field construction.
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Authors and Affiliations

Lei Shi
1
ORCID: ORCID
Weiyong Lu
1 2
ORCID: ORCID
Dong Lv
3 4
ORCID: ORCID
  1. Lyuliang University, Departme nt of Mining Engineering, Lvliang, Shanxi 033001, China
  2. Lvliang Engineering Research Center of Intelligent Coal Mine, Lvliang, Shanxi 033001, China
  3. Inner Mongolia Energy Group Co., Ltd., Hohhot, Inner Mongolia 010090, China
  4. Inner Mongolia Tongsheng Selian Coal Development Co., Ltd. Ordos, Inner Mongolia 014399, China

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