Shear viscosity of a highly concentrated suspension consisting of an Engage 8407 matrix mixed with a Dechlorane plus 25 at 60 wt% was studied by using a plate-plate rheometer. The rheological characterization at various gap distances between two plates revealed no-slip of the suspension at the walls over a broad range of shear stresses in rotational flows. The apparent shear viscosity behavior of highly concentrated suspensions at high wall shear stress was investigated, and the no-slip layer thickness was determined. It was concluded that the rheological characteristics of the highly concentrated suspensions could be corrected by no-slip effects at the walls.

평판-평판 레오미터를 이용하여 Engage 8407 기지재에 Dechlorane plus 25를 60 wt% 혼합한 고농축 현탁계의 전단 점도를 연구하였다. 평판-평판간 간격을 변화시켜가며 유변학적 특성을 분석한 결과, 회전흐름 시 넓은 범위의 전단응력에서 벽면에서의 no-slip이 밝혀졌다. 또한 높은 벽면 전단응력에서 고농축 현탁계의 겉보기 전단 점도거동을 조사하였으며 no-slip 층의 두께를 결정하였다. 벽면 no-slip 효과를 이용하여 고농축 현탁계의 유변학적 특성을 보정할 수 있으리라 사료된다.

Keywords: wall no-slip; highly concentrated suspensions; true viscosity; extended velocity; no-slip layer