환형관내 굴착유체의 편심회전유동에 관한 수치해석적 연구

다국어 초록 (Multilingual Abstract)

The paper concerns numerical study of fully developed laminar flow of a Newtonian water and non-Newtonian fluids, 0.2% aqueous of sodium carboxymethyl cellulose(CMC) solution in eccentric annuli with combined bulk axial flow and inner cylinder rotation. Pressure losses and skin friction coefficients have been measured when the inner cylinder rotates at the speed of 0～200 rpm. A numerical analysis considered mainly the effects of annular eccentricity and inner cylinder rotation. The present analysis has demonstrated the importance of the drill pipe rotation and eccentricity. In eccentricity of 0.7 of a Newtonian water, the flow field is recirculation dominated and unexpected behavior is observed. it generates a strong rotation directed layer, that two opposing effects act to create two local peaks of the axial velocity. The influences of rotation, radius ratio and working fluid on the annular flow field are investigated.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 수치 해석
• 2.1 작동유체의 특성
• 2.2 수치해석적 방법
• 3. 해석결과 및 고찰
• 3.1 수치해석 결과
• 4. 결론
• 참고문헌

참고문헌 (Reference)

1 Taylor, G. I, "Stability of a Viscous Fluid Contained Between Two Rotating Cylinder" 223 : 289-343, 1923

2 Hwang, Y. K, "Helical flow Study on Non-Newtonian Fluid in an Inclined Annulus with Rotating Inner Cylinder" 1944-1949, 2002

3 Richard, E. W, "Helical Flow of Bentonite Slurries"

4 Pinho, F. T, "Flow of Non-Newtonian Fluids in A Pipes" 34 : 129-144, 1990

5 Nouri, J. M, "Flow of Newtonian and Non-Newtonian Fluids in a Concentric Annulus With Rotation of the Inner Cylinder" 116 : 821-827, 1994

6 Escudier, M. P, "Concentric annular flow with centerbody rotation of a Newtonian and a shear-thinning liquid, Int" 16 : 156-162, 1995