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A measurement technique for the first normal stress difference using a conventional rheometer with a concentric cylinder flow cell is examined. The conventional rheometer, which can control the up and down speeds of an inner cylinder of the concentric cylinder flow cell and can also measure the thrust force, is used in this technique. The other additional instruments or the optional devices are not required. The inner cylinder is pushed down with a constant velocity into the sample filled in the cup. The resistant force acting on the inner cylinder is measured during this motion. The resistant force is caused by the buoyancy, the shear stress acting on the side surface of the inner cylinder and the pressure acting on the top and bottom of the inner cylinder. The buoyancy and the shear stress can be calculated based on the shape of the inner cylinder and the moving velocity. If the inlet and outlet pressure drop can be ignored, the pressure caused by the first normal stress difference can be evaluated from the thrust force and the shear viscosity.

nihon reoroji gakkaishi/nihon reorojī gakkaishi

Evaluation of First Normal Stress Difference from Resistant Force Acting on Inner Cylinder of Concentric Cylinder Flow Cell Descending with a Constant Speed