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점소성 유체의 압착유동에 관한 연구: II. 유한요소 수치모사에 의한 항복경계면 조사

Squeeze Film Flow of Viscoplastic Fluids: II. Investigation of the Yield Surface by Finite Element Simulations

HWAHAK KONGHAK, August 1988, 26(4), 428-434(7), NONE
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Abstract

유한요소법에 의한 수치모사를 수행하여 점소성 유체의 압착유동장 내에서의 항복경계면의 존재 여부를 조사하였다. Bingham 유체의 경우, 압착유동이 지속되는 한 유동장 내에 항복경계면이 존재하지 않는다는 것이 밝혀졌으며, 근사식으로 상용된 bi-viscosity 모델의 경우에는 압착속도 및 γ(=μpγ) 값에 따라 기존에 제시된 여러 모양의 항복경계면이 모두 존재할 수 있음을 보였으나, Bingham 모델에 접근하게 되면 결국 항복경계면이 사라짐을 보였다.
The existence of the yield surface in the squeeze film flow of viscoplastic fluids was investigated by finite element simulations. In the case of Bingham fluid, the yield surface does not exist within the squeezing flow field as long as the squeezing process continues. When the bi-viscosity model is used as approximate constitutive equation of viscoplastic fluids, various shapes of the yield surfaces which have been proposed by previous researchers are observed depending on the squeezing speed and the value of γ(=μpr). But, eventually the yield surface disappears as the model approaches to Bingham model.

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