The significance of liquids in abrasive wire sawing has been demonstrated in several studies.However,the perfor-mance of its spreading behavior is limited by the current development trend,where the wafer has a larger ...The significance of liquids in abrasive wire sawing has been demonstrated in several studies.However,the perfor-mance of its spreading behavior is limited by the current development trend,where the wafer has a larger area and the kerf is narrower.Moreover,there are very few studies on the liquid spreading behavior in wire-sawn kerfs.Therefore,a 3D CFD(computational fluid dynamics)model is presented in this paper and used to simulate the liquid spreading behavior in a kerf based on a VOF(volume of fluid)method with a CSF(continuum surface force)model,which is used to simulate multiphase flow,and an empirical correlation for characterizing the liquid dynamic contact angle using UDF(user defined functions).Subsequently,parametric simulations are performed on the kerf area,kerf width,liquid viscosity,liquid surface tension,and liquid velocity at the inlet area of the kerf,and verification experi-ments are conducted to determine the validity of the simulation model.From the simulation and experimental results,three typical liquid spreading regimes that exhibit different effects on wire sawing in the kerfs are found,and their limiting conditions are identified using non-dimensional analysis.Subsequently,a prediction model is pro-posed for the liquid spreading regime based on a set of Weber and Capillary numbers.For wire sawing,an increase in the wafer area does not change the liquid spreading regime in the kerf;however,a reduction in the kerf width sig-nificantly hinders the liquid spreading behavior.Thereby,the spreading regime can be effectively converted to facili-tate wire sawing by adjusting the physical properties and supply conditions of the liquid.展开更多
To address the challenges of poor surface quality and high energy consumption in marble cutting,this study introduces an auxiliary abrasive jet cutting technology enhanced by the use of polyacrylamide(PAM)as a dragred...To address the challenges of poor surface quality and high energy consumption in marble cutting,this study introduces an auxiliary abrasive jet cutting technology enhanced by the use of polyacrylamide(PAM)as a dragreducing additive.The effects of feed rate(50-300 mm/min),polymer concentration(0-0.5 g/L),and nozzle spacing(4-12 mm)on kerf width and surface roughness are systematically investigated through an orthogonal experimental design.Results reveal that feed rate emerges as themost significant factor(p<0.01),followed by PAM concentration and nozzle spacing.The optimal set of parameters,comprising a 200 mm/min feed rate,0.3 g/L PAM concentration,and 6mmnozzle spacing,achieves the narrowest kerf width(0.867 mm)and the lowest surface roughness(10.220μm).Analysis of the underlying mechanisms demonstrates that PAMenhances the energy efficiency of the jet by suppressing turbulent pulsations and increasing fluid viscoelasticity,thereby minimizing energy loss during the cutting process.展开更多
基金Supported by National Natural Science Foundation of China(Grant Nos.51375179,U22A20198).
文摘The significance of liquids in abrasive wire sawing has been demonstrated in several studies.However,the perfor-mance of its spreading behavior is limited by the current development trend,where the wafer has a larger area and the kerf is narrower.Moreover,there are very few studies on the liquid spreading behavior in wire-sawn kerfs.Therefore,a 3D CFD(computational fluid dynamics)model is presented in this paper and used to simulate the liquid spreading behavior in a kerf based on a VOF(volume of fluid)method with a CSF(continuum surface force)model,which is used to simulate multiphase flow,and an empirical correlation for characterizing the liquid dynamic contact angle using UDF(user defined functions).Subsequently,parametric simulations are performed on the kerf area,kerf width,liquid viscosity,liquid surface tension,and liquid velocity at the inlet area of the kerf,and verification experi-ments are conducted to determine the validity of the simulation model.From the simulation and experimental results,three typical liquid spreading regimes that exhibit different effects on wire sawing in the kerfs are found,and their limiting conditions are identified using non-dimensional analysis.Subsequently,a prediction model is pro-posed for the liquid spreading regime based on a set of Weber and Capillary numbers.For wire sawing,an increase in the wafer area does not change the liquid spreading regime in the kerf;however,a reduction in the kerf width sig-nificantly hinders the liquid spreading behavior.Thereby,the spreading regime can be effectively converted to facili-tate wire sawing by adjusting the physical properties and supply conditions of the liquid.
基金supported by the National Natural Science Foundation of China(grant number:52006061)the Key R&D Program of Hunan Province(grant number:2024AQ2001)+2 种基金Scientific Research Program of Hunan Provincial Department of Education(grant number:22B0840)Natural Science Foundation of Hunan Province(grant number:2023JJ50483)Hunan University of Humanities,Science and Technology Graduate Student Research and Innovation Program(ZSCX2024Y06,ZSCX2024Y01).
文摘To address the challenges of poor surface quality and high energy consumption in marble cutting,this study introduces an auxiliary abrasive jet cutting technology enhanced by the use of polyacrylamide(PAM)as a dragreducing additive.The effects of feed rate(50-300 mm/min),polymer concentration(0-0.5 g/L),and nozzle spacing(4-12 mm)on kerf width and surface roughness are systematically investigated through an orthogonal experimental design.Results reveal that feed rate emerges as themost significant factor(p<0.01),followed by PAM concentration and nozzle spacing.The optimal set of parameters,comprising a 200 mm/min feed rate,0.3 g/L PAM concentration,and 6mmnozzle spacing,achieves the narrowest kerf width(0.867 mm)and the lowest surface roughness(10.220μm).Analysis of the underlying mechanisms demonstrates that PAMenhances the energy efficiency of the jet by suppressing turbulent pulsations and increasing fluid viscoelasticity,thereby minimizing energy loss during the cutting process.
