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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국유체기계학회 International Journal of Fluid Machinery and Systems International Journal of Fluid Machinery and Systems Vol.14 No.2
- 발행연도
- 2021.6
- 수록면
- 150 - 160 (11page)
- DOI
- 10.5293/IJFMS.2021.14.2.150
이용수
초록· 키워드
오류제보하기
In this study, we analyze the flow characteristics of pulp suspensions in a sudden expansion channel, which is used as a tube bank in papermaking machines. Flow visualization using a light section method and measurements of time averaged and fluctuating fiber concentrations, C<SUB>a</SUB> and C’, and pressure were performed. The experiments were carried out on pulp suspensions with a bulk fiber concentration (C<SUB>s</SUB>) of 0 2.0 wt% in a channel with an expansion ratio of β = 2 at varied average velocities (U<SUB>a</SUB>) of 0.04-6.6 m/s. We examined the effect of flow velocity on the changes in concentration and pressure distributions along the channel axis The distribution of the pulp fiber concentration behind the sudden expansion significantly changes depending on the flow state in the upstream channel before the expansion. In particular, for low and moderate velocities, the flow field is characterized in the main flow region consisting of flocculated plug fibers and a recirculation region with a low concentration near the expansion corner by a type of streamline originated from the thin water layer in the upstream channel. The distribution of C<SUB>a</SUB> shows a tongue shaped structure in the central part of the cross section and C’ is large near the annulus streamline As the velocity is further increased, the flocculated fibers gradually disperse and the distributions of C<SUB>a</SUB> and C’ become almost uniform. In addition, the uniformity of fiber concentration does not change much in the section downstream from a distance 10 times the step height from the sudden expansion plane.
목차
Abstract
1. Introduction
2. Experimental Apparatus and Procedures
3. Results and Discussion
4. Conclusions
References
참고문헌 (32)
참고문헌 신청
The Japan Society of Mechanical Engineers / 1979 / JSME Data Handbook: Hydraulic Losses in Pipes and Ducts / The Japan Society of Mechanical Engineers
Yamazaki, H / 2006 / Removing Paper Machine Bottlenecks with Targeted Rebuilds: Recent Topics for Rebuilds of Headbox, Former and Press Sections / Japan Tappi Journal, 60(4):920~936
Takano, Y / 2015 / History and State-of-the-art Technology of Paper Machine Wet Section / Japan Tappi Journal 69(9):920~936
VerWeyst, B. E / 2002 / Fiber Suspensions in Complex Geometries: Flow/Orientation Coupling / The Canadian Journal of Chemical Engineering 80:1093~1106
Lin, J / 2011 / Fibre Orientation Distribution in Turbulent Fibre Suspensions Flowing through an Axisymmetric Contraction / The Canadian Journal of Chemical Engineering 89:1416~1425
Yamazaki, H / 2006 / Removing Paper Machine Bottlenecks with Targeted Rebuilds: Recent Topics for Rebuilds of Headbox, Former and Press Sections / Japan Tappi Journal, 60(4):920~936
Takano, Y / 2015 / History and State-of-the-art Technology of Paper Machine Wet Section / Japan Tappi Journal 69(9):920~936
VerWeyst, B. E / 2002 / Fiber Suspensions in Complex Geometries: Flow/Orientation Coupling / The Canadian Journal of Chemical Engineering 80:1093~1106
Lin, J / 2011 / Fibre Orientation Distribution in Turbulent Fibre Suspensions Flowing through an Axisymmetric Contraction / The Canadian Journal of Chemical Engineering 89:1416~1425
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