The Experts below are selected from a list of 1314 Experts worldwide ranked by ideXlab platform
Valerie Vidal - One of the best experts on this subject based on the ideXlab platform.
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stability of a liquid Jet impinging on confined saturated sand
Physical Review Letters, 2020Co-Authors: Jeremy Vessaire, German Varas, Sylvain Joubaud, Romain Volk, Mickael Bourgoin, Valerie VidalAbstract:This Letter focuses on the dynamics of a liquid Jet Impacting the surface of a confined, immersed granular bed. Although previous works have considered the erosion process and surface morphology, less attention has been given to the Jet hydrodynamics. Based on laboratory experiments, we show that when the liquid Jet forms a crater, two situations arise. For weak or no erosion and for open craters, the Jet is stationary. For vertical or overhanging crater walls, the Jet displays a wide range of behaviors, from quasiperiodic oscillations to symmetry breaking and exploration of different states in time. An analysis of the different system states leads to the emergence of a bifurcation diagram depending on a dimensionless parameter, J, comparing the Jet Impact Force to the Force necessary to eject a grain. The frequency of the Jet oscillations depends on the inertial velocity, the Jet dispersion and the ratio between the injector cross section and the confinement length.
Jeremy Vessaire - One of the best experts on this subject based on the ideXlab platform.
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stability of a liquid Jet impinging on confined saturated sand
Physical Review Letters, 2020Co-Authors: Jeremy Vessaire, German Varas, Sylvain Joubaud, Romain Volk, Mickael Bourgoin, Valerie VidalAbstract:This Letter focuses on the dynamics of a liquid Jet Impacting the surface of a confined, immersed granular bed. Although previous works have considered the erosion process and surface morphology, less attention has been given to the Jet hydrodynamics. Based on laboratory experiments, we show that when the liquid Jet forms a crater, two situations arise. For weak or no erosion and for open craters, the Jet is stationary. For vertical or overhanging crater walls, the Jet displays a wide range of behaviors, from quasiperiodic oscillations to symmetry breaking and exploration of different states in time. An analysis of the different system states leads to the emergence of a bifurcation diagram depending on a dimensionless parameter, J, comparing the Jet Impact Force to the Force necessary to eject a grain. The frequency of the Jet oscillations depends on the inertial velocity, the Jet dispersion and the ratio between the injector cross section and the confinement length.
Yayu Liu - One of the best experts on this subject based on the ideXlab platform.
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Design of High-Pressure WaterJet Descaling Nozzles Testing System with LabVIEW
Advanced Materials Research, 2011Co-Authors: Nan Yang, Yayu LiuAbstract:The descaling technology with high-pressure waterJet is widely used in hotrolling process. WaterJets from descaling nozzles play a crucial role on surface quality of hot-rolling steel billet. Since structure of a nozzle accounts for characteristics of the waterJet produced, nozzle structural data are very important for hotrolling billet descaling. However, some of nozzle structural data can only be obtained through experiment due to machining tolerance generated during the factory production of the nozzle. A set-up investigating descaling nozzles performance was established. Laboratory Virtual Instrumentation Engineering Workbench (LabVIEW) was applied to develop a testing system of the set-up, through which the real-time measurement of descaling nozzle data could be achieved. The testing system included three modules, pressure-flow curve, three-dimensional(3D) platform movement track and Jet Impact Force measurement. All the nozzle structural data and water Jet performance could be obtained by means of the modules. A GPZ10-type nozzle used for scale removal was tested. Results obtained were presented and discussed.
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Development of Impact test system for waterJet descaling nozzles with labview
Proceedings - 2010 International Conference on Web Information Systems and Mining WISM 2010, 2010Co-Authors: Yayu Liu, Fei Ma, Hui Xie, Yong LiAbstract:High-pressure water Jet technology is widely used in hot-rolling billet descaling process. Impact Force and behavior of Jets play a vital role on effect of water Jet billet descaling. The parameters of nozzles and Jet determine the characteristics of Jetting. Some of these parameters, however, can only be obtained through experimentation. The mechanism of high-pressure water Jet billet descaling was analyzed in this paper. The factors affecting billet descaling were also discussed. Furthermore, theoretical formula accounting for water Jet Impact Force was derived from the discussion. An indoor test set-up investigating Impact properties of water Jet descaling nozzles was established. Virtual instrument Lab VIEW was combined with mathematics software MATLAB to develop a measuring system of the test set-up. The real-time test of descaling nozzles parameters can be achieved through the system. The measuring system included three modules: pressure-flow curve, three-dimensional platform movement track and Jet Impact Force measurement. Various parameters of the nozzles and Jet can be obtained by means of the modules. Experimental results were compared with theoretical ones and observations were made regarding the variation of parameters. Results showed that variation of the parameters yielded by experiments agreed well with theoretical prediction. Variation of each parameter was visually depicted. The Impact Force and behavior of the Jet were accurately measured. It contributes to descaling nozzle design improvement and descaling system structure optimization.
Mickael Bourgoin - One of the best experts on this subject based on the ideXlab platform.
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stability of a liquid Jet impinging on confined saturated sand
Physical Review Letters, 2020Co-Authors: Jeremy Vessaire, German Varas, Sylvain Joubaud, Romain Volk, Mickael Bourgoin, Valerie VidalAbstract:This Letter focuses on the dynamics of a liquid Jet Impacting the surface of a confined, immersed granular bed. Although previous works have considered the erosion process and surface morphology, less attention has been given to the Jet hydrodynamics. Based on laboratory experiments, we show that when the liquid Jet forms a crater, two situations arise. For weak or no erosion and for open craters, the Jet is stationary. For vertical or overhanging crater walls, the Jet displays a wide range of behaviors, from quasiperiodic oscillations to symmetry breaking and exploration of different states in time. An analysis of the different system states leads to the emergence of a bifurcation diagram depending on a dimensionless parameter, J, comparing the Jet Impact Force to the Force necessary to eject a grain. The frequency of the Jet oscillations depends on the inertial velocity, the Jet dispersion and the ratio between the injector cross section and the confinement length.
Romain Volk - One of the best experts on this subject based on the ideXlab platform.
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stability of a liquid Jet impinging on confined saturated sand
Physical Review Letters, 2020Co-Authors: Jeremy Vessaire, German Varas, Sylvain Joubaud, Romain Volk, Mickael Bourgoin, Valerie VidalAbstract:This Letter focuses on the dynamics of a liquid Jet Impacting the surface of a confined, immersed granular bed. Although previous works have considered the erosion process and surface morphology, less attention has been given to the Jet hydrodynamics. Based on laboratory experiments, we show that when the liquid Jet forms a crater, two situations arise. For weak or no erosion and for open craters, the Jet is stationary. For vertical or overhanging crater walls, the Jet displays a wide range of behaviors, from quasiperiodic oscillations to symmetry breaking and exploration of different states in time. An analysis of the different system states leads to the emergence of a bifurcation diagram depending on a dimensionless parameter, J, comparing the Jet Impact Force to the Force necessary to eject a grain. The frequency of the Jet oscillations depends on the inertial velocity, the Jet dispersion and the ratio between the injector cross section and the confinement length.