The Impact of Periodic Vibration in Vertical Direction on the Development of Double-Diffusive Convection of a Liquid Binary Alloy during the Unidirectional Solidification Process
Solidification of binary solutions is employed in industry very often.Casting of binary alloys is one of them.In the past,one of the main studies focused on how to eliminate or weaken double-diffusive convection during solidification because double-diffusive convection was the main reason to cause poor material quality in the final ingots.The purpose of this study is to investigate the periodic vibration in the vertical direction on the development of double-diffusive convection during solidification.A hyper-eutectic binary solution (NH4Cl-H2O) was adopted as the test sample in this study and it was put into an enclosure cooled from the bottom,known as unidirectional solidification (UDS) process,to investigate the heat and mass transport phenomena during solidification.The experiments conducted in this study included flow visualization by shadowgraph,measurement of channel size and channel distribution,transient temperature distribution,and movement of the solid/mush and liquid/mush interfaces.Experimental results show that increasing the vibrating frequency does not give any significant suppression effect on the formation of the plume-type double-diffusive convection.However the increase of vibrating amplitude can effectively suppress formation of the plume-type double-diffusive convection as well as channel number and channel size.
Double-diffusive convection Hyper-eutectic binary solution Liquid binary alloys Periodic vibration Unidirectional solidification (UDS)
Shih Y-C Ye J-S Chiu C-C Chang S-L
Department of Energy and Refrigerating Air-Conditioning Engineering National Taipei University of Technology,Taipei 106,Taiwan,R.O.C
国际会议
西安
英文
1-7
2012-08-26（万方平台首次上网日期，不代表论文的发表时间）