Study On Heat Transfer Characteristics Of Jet Cooling Of Amorphous Alloy Continuous Casting

As a new material,amorphous alloy has high hardness,excellent corrosion performance,good self-sharpness and inverted magnetic ability,and has been successfully used in the preparation of composite fuel materials,aerospace etc.The preparation of amorphous alloys requires a high cooling rate.As an efficient cooling method,jet cooling has a strong heat transfer capacity,and is an effective solution to the problem of amorphous alloys'cooling rate.The influence of different cooling parameters on the heat transfer characteristics of zirconium based amorphous alloy during cooling process was studied in this paper and the simulation results were optimized by orthogonal experiment.The effects of different cooling parameters on the heat transfer characteristics were obtained,which provided data support for industrial production.A a set of double strip continuous casting equipment for zirconium based amorphous alloy is improved.The traditional cooling method is changed to gas jet cooling,which can provide a faster cooling rate and meet the needs of zirconium based amorphous alloy preparation.Zr₄₁Ti₁₄Cu_12.5Ni₁₀Be_22.5 alloy was selected as the research object,and its thermo-physical properties parameters were determined.The SST k-?turbulence model was selected as the turbulence model for the simulation of jet cooling in this paper.Based on this,a heat transfer experiment platform was established to simulate the cooling process of zirconium based amorphous alloy.The effects of nozzle shape,nozzle arrangement,jet velocity,nozzle diameter,nozzle height,nozzle spacing and other factors on wall heat transfer characteristics are analyzed.The results show that the nozzle spacing has a very important influence on the heat transfer effect of the wall,and appropriately reducing the nozzle spacing can improve the heat transfer intensity of the wall and improve the heat transfer non-uniformity.When the nozzle spacing L=20mm,it is optimal and is more obvious to improve the heat transfer intensity of the wall by using the fork arrangement.The nozzle diameter and injection velocity are important factors affecting the heat transfer effect.When the nozzle diameter D=6mm,the heat transfer effect is the best,while other factors have little influence.Through orthogonal test to analyze and evaluate the different factors,influence degree from high to low are:nozzle spacing,injection speed,nozzle diameter and height of nozzle,the nozzle diameter under the factors of velocity distribution volatile,less volatile nozzle height under the factors of velocity distribution,and it is concluded that the optimal combination.The numerical simulation of the optimal combination shows that the heat transfer intensity is higher and the wall heat transfer is more uniform,indicating that it can meet the requirements of heat transfer analysis during cooling process and have certain guiding significance for actual industrial production.