Abstract: A planar elongational viscosity measuring method and apparatus which can advance analysis of planar elongational viscosities for high-viscosity and low-viscosity fluids. As a bomb-shell like bob 2 is pushed into a container 6, a non-Newtonian fluid 9 reaches a planar elongation state in a side space G, counterforce F applied to the bomb-shell like bob 2 at this time is measured, planar elongation stress ? is calculated using the counterforce F and conditions input by a user based on push-up force, the counterforce F, and the horizontal cross-sectional area of the side space G, and the planar elongation stress is divided by a planar elongation speed ??, thereby acquiring a planar elongational viscosity ?PE.

Abstract: There is provided a fluid analysis method and its device which are capable of easily analyzing a normal stress difference of a low-viscosity fluid in addition to that of a high-viscosity fluid. A shearing fluidity is applied to a non-Newtonian fluid within a lateral-side gap by pushing a cylindrical bob into a container. At that time, reactive force applied to the cylindrical bob is measured. Then, by practicing an arithmetic process in a given form using the reactive force and each of conditions input by a user, the normal stress difference of the low-viscosity non-Newtonian fluid which is hard to form in a solid state can be certainly determined. Thus, with respect to the low-viscosity non-Newtonian fluid in addition to the high-viscosity non-Newtonian fluid, the normal stress difference can be easily analyzed.

Abstract: A planar elongational viscosity measuring method and apparatus which can advance analysis of planar elongational viscosities for high-viscosity and low-viscosity fluids. As a bomb-shell like bob 2 is pushed into a container 6, a non-Newtonian fluid 9 reaches a planar elongation state in a side space G, counterforce F applied to the bomb-shell like bob 2 at this time is measured, planar elongation stress ? is calculated using the counterforce F and conditions input by a user based on push-up force, the counterforce F, and the horizontal cross-sectional area of the side space G, and the planar elongation stress is divided by a planar elongation speed ??, thereby acquiring a planar elongational viscosity ?PE.