지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2014.1
- 수록면
- 177 - 183 (7page)
이용수
초록· 키워드
오류제보하기
The microstructures of suspensions of spherical particles under the torsional flow between two parallel plates are studied by using the optical microscopy and the small angle light scattering technique (SALS) along the velocity gradient direction. The particle diameter is 2.2 micrometer and the gap distance between two parallel plates is 200 micrometer. The dispersing media are glycerin, aqueous solution of 4% xanthan gum and 1500 ppm polyacrylamide solution in glycerin. The xanthan gum solution is strongly shear thinning with the shear thinning index of 0.2. The polyacrylamide solution behaves as a Boger fluid rheologically. The result shows that the microstructure observed in the wide gap experiment is qualitatively different from the microstructure observed in the monolayer experiments reported in the literature. In glycerin, a random structure is observed. In the shear thinning fluid, particles appear to be weakly chained and aligned along the vorticity direction below 100 s-1 and along the flow direction over $100s^{-1}$. In the Boger fluid, particles align along the vorticity direction and form short strings within the fluid. The alignment appears to be originated from the elastic effect rather than the shear thinning effect. A new flow pattern of the banded structure is occasionally observed for the Newtonian suspension which still shows a random microstructure of suspended particles. This flow pattern is always present in the shear thinning fluid while it is never present in the Boger fluid.
목차
등록된 정보가 없습니다.
참고문헌 (21)
참고문헌 신청
Brunn, P.O. / 1977 / The slow motion of a rigid particle in a second- order fluid / J. Fluid Mech 82:529~547
Gunes, D.Z. / 2008 / Flowinduced orientation of non-spherical particles: Effect of aspect ratio and medium rheology / J. Non-Newt. Fluid 155:39~50
Harlen, O.G. / 1993 / Simple shear flow of a suspension of fibers in a dilute polymer solution at high Deborah number / J. Fluid Mech 252:187~207
Jefri, M. A. / 1989 / Elastic and viscous effects on particle migration in plane-Poiseuille flow / J. Rheol 33:691~708
Kim, J. / 2008 / Numerical simulations of particle migration in suspension flows: Frame-invariant formulation of curvature-induced migration / J. Non-Newt.Fluid 150:162~176
Gunes, D.Z. / 2008 / Flowinduced orientation of non-spherical particles: Effect of aspect ratio and medium rheology / J. Non-Newt. Fluid 155:39~50
Harlen, O.G. / 1993 / Simple shear flow of a suspension of fibers in a dilute polymer solution at high Deborah number / J. Fluid Mech 252:187~207
Jefri, M. A. / 1989 / Elastic and viscous effects on particle migration in plane-Poiseuille flow / J. Rheol 33:691~708
Kim, J. / 2008 / Numerical simulations of particle migration in suspension flows: Frame-invariant formulation of curvature-induced migration / J. Non-Newt.Fluid 150:162~176
이 논문의 저자 정보
최근 본 자료
댓글(0)
0