Obiettivo
1. The problem of balancing flow in a 3-D flow path has been approached with the development of a viscous flow model. This has been extensively validated by the members of the consortium with considerable reported success.
2. The previous model was initially based on Hele-Shaw flow in which the effects of side walls are neglected. A non-isothermal duct flow model has been developed which augments the non-isothermal Hele-Shaw mathematical model.
3. The viscous flow approximation is limited to balancing of flow at the exit of the die. This project is concerned with die swell which is due to the viscoelasticity of the material. A viscoelastic flow analysis has been developed utilising a KBKZ constitutive equation. This compares favourably with other systems which are more CPU intensive.
A complex 3-D shape would be very difficult to analyse in a reasonable CPU time. If the simulated shapes are simplified i.e. rods and slits, with suitable interpolation based on a series of ellipses approximating the general shape, a complex 2-D shape can be modelled. This model utilises a medial axis developer with a rolling ball utilised modelling the shape and thickness of the die exit. This has formed a major aspect of the general mathematical model and plays an important part in the calculation of die swell. Together with the visco elastic flow model this forms an extensive capability for the prediction of die swell. This facility has been incorporated with the die swell predictive model.
5. The models for viscous and viscoelastic flow require certain material characteristics. Twenty one materials have been characterised for both types of analyses.
6. An experimental rig was built to measure die swell on various shapes. Unfortunately the lasers were inoperative which limited the accuracy of the measurements. However, using appropriate methods predictions of die swell can be made using both empirical and theoretical databases.
Campo scientifico
- natural sciencescomputer and information sciencesdatabases
- engineering and technologyelectrical engineering, electronic engineering, information engineeringelectronic engineeringcomputer hardwarecomputer processors
- natural sciencesphysical sciencesopticslaser physics
- natural sciencesmathematicsapplied mathematicsmathematical model
Argomento(i)
Data not availableInvito a presentare proposte
Data not availableMeccanismo di finanziamento
CSC - Cost-sharing contractsCoordinatore
SY4 4NR Shrewsbury
Regno Unito