Three-dimensional presentation of extensional flow data

摘要: Abstract A proposal has been made by Ferguson and Hudson (Eur. Polym. J., 29 (1993) 141–147; J. Non-Newtonian Fluid Mech., 52 (1994) 121–135) that three-dimensional representation of extensional flow data can be used to resolve apparent disagreements among the results from a variety experiments. theoretical investigation procedure, which involves plotting transient viscosity against strain time is carried out in this paper. We then seek draw some conclusions about validity limitations approach. The method does not work for purely viscous non-newtonian liquids or simple (co-rotational upper convected) Maxwell models. However, failure lie close unique surface (for any particular material) most marked situations where our models are least reliable. More work, both experimental theoretical, required.