저농도 점탄성유체의 유변학적 특성연구 = A Study on the Rheological Characteristics of Low Density Viscoelastic Fluid

다국어 초록 (Multilingual Abstract)

Both two laser beams and a digital timer system were used to accurately measure the terminal velocity of a falling ball in the viscometer. In this study, the apparent viscosity and the characteristic relaxation time of the aqueous polyacrylamide Seperan AP-273 solution using the falling ball viscometer were determined. The characteristic relaxation time increased as the polyacrylamide concentration increased. In the Powell-Eyring model, the largest characteristic time was predicted among the tested rheological models. The PIV system was employed to visualize the flow phoenmena around balls.