Numerical study on melt rheology of ABS using capillary rheometer
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Date
2016-06
Authors
Nurliyana Azreen Azhar
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Abstract
A numerical study on melt rheology of Acrylonitrile Butadiene Styrene (ABS) using capillary rheometer was carried out. The aim of the study was to observe and understand the behaviour of the flow of shear thinning fluids through capillary rheometer. Two dimensional simulation of polymer rheology in a capillary rheometer was used. FLUENT 15.0 software was used in the simulation to verify the viscosity model (Cross model). The effects of variation in process parameters such as temperature, plunger head and transfer speed on its rheology were studied. Temperature was found to have prominent influences on the viscosity of the ABS melt. Whereas, plunger head displacement was displayed on the flow pattern when it moved at constant transfer speed and constant temperature. There was some effect on the flow pattern of ABS melt for the flat head. Velocity profile were observed and it was discovered that “dome-like” flow was gained instead of “plug-like” flow that was expected for most polymer melts. Mostly previous researchers conducted an experimental about polymer fluid to determine rheological behaviour but most of them did not do the simulation analysis. Besides that, the methodology method also influenced the rheology result. A lot of parameters had to be considered to study about flow of the fluid behaviour. The simulation results are in good conformity and the strength of FLUENT 15.0 in handling capillary rheometer problems is proved to be excellent.