Constrained Fast Rheological System Thin Layer Of Melt Flow Field And Temperature Field Of Study

The paper's background come from metal melt of suppling casting strips that thickness ratio wideth (H/L) is very small and fluid volume's temperature field is uniform very much for fast solidification roll casting. A scientific cavity constraining must be designed in order to earring out those target, thus this paper studing core scientific problem may be oriented to the constraining fast flow veriation system thin gauge melt fluid field and temperature field studied. The main subjects of the dissertation are shown as following:1) The three dimension fluid field and temperature field mathematical model of constrainting thin gauge melt for appling tip cavity melt flow was developed.2) The water modeling similarity criteria of constrainting thin gauge melt for appling tip cavity melt flow was developed.3) Theory analysis, numerical simulation and water modeling had shown: based on the cavity of big wideth ratio thickness and veriating transverse section, the constrainting thin gauge flowing melt flowing has turbulent and flow direction eddy. The turbulent intensity increse with the increasing of fluid volume, and the melt flow was quasi-laminer in tip exit.4) The general constrainting concept was produce. The theory calcalation and numerical simulation had shown: It is revealed that the structure constrainting that is cavity structure or the power constrainting that is cavity entrance distribution velocity, was changed to change distribution resistance for improving uniform of tip cavity exit melt distribution velocity and temperature is practicable.5) The numerical simulation of affecting cavity exit melt velocity and temperature through different entrance velocity variation forms and different entrance distribution velocity had shown: It is revealed that the flow distribution on-line for improving tip cavity fluid field and temperature field is practicable.6) The numerical simulation of affecting cavity fluid field and temperature field through the structure constrainting design perameters had shown: The most effective method for obtaining uniform melt distribution velocity and temperature of cavity exit is that sides were parallel, slight divergent or slight convergent,extend cavity length, reduced spacer scale, and with the increase of wax length retio spacer length (Ij/b) value, the cavity exit melt distribution velocity became more and more homogeneous. The water modeling experiment had tested: with the increase of wax length retio spacer length (li/b) value, the cavity exit melt distribution velocity become more and more homogeneous.7) The tip cavity was design that the cavity exit melt velocity and temperature can meet the need of thin gauge-high speed casting technology.