TY - JOUR
TI - Isothermal Gas assisted displacement of a polystyrene melt
LA - eng
PB - Hexagon Holding ApS
AU - Eriksson, Torbjörn Gerhard
AU - Rasmussen, Henrik K.
JF - Pps07 Ea
SP - 1
EP - 7
PY - 2007
AB - Isothermal gas displacements of a polystyrene melt (shaped as circular cylinder with a radius of 2.5mm) placed inside a circular steel annulus were performed. A flow valve ensures a constant flow rate and rotational symmetric flow during the displacement. The experiments show an increase in the steady fractional coverage above a Newtonian level at very low Deborah numbers. At higher Deborah numbers, where the melt behaves as an entangled melt system, the steady fractional coverage decreases. The fractional coverage is the fraction of melt left in the cylinder during steady displacement. Numerical finite element simulations show quantitative agreement within experimental error for Deborah numbers 0.3