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논문 기본 정보

자료유형
학술저널
저자정보
Masaru Sumida (Kindai University)
저널정보
한국유체기계학회 International Journal of Fluid Machinery and Systems International Journal of Fluid Machinery and Systems Vol.14 No.2
발행연도
2021.6
수록면
176 - 182 (7page)
DOI
10.5293/IJFMS.2021.14.2.176

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초록· 키워드

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An experimental study was performed on the fiber-concentration distributions of wood pulp liquid flowing through a divergent tube at a divergence angle of θ = 12°.The study was conducted to verify the tube’s effectiveness for application to the tube banks of papermaking machines. Experiments were conducted at bulk pulp-fiber concentrations of C<SUB>s</SUB> = 0.2-0.6 wt% and inflow velocities of U<SUB>a</SUB> = 0.1-2 m/s. The flow in the horizontal plane that contained the tube axis was visualized using the light-section method. In addition, the distributions of the time-averaged and fluctuating fiber concentrations (C<SUB>a</SUB> and C’, respectively) were measured. We then investigated the effect of the average flow rate on the variations in the directions of flow of the concentration distributions. Ata low flow rate (U<SUB>a</SUB><0.3m/s), the fluid of the annular water layer formed in the upstream tube divided the flow into two in the divergent tube, and the C<SUB>a</SUB> and C’ distributions exhibited shapes that had considerable differences in the cross-section. When the flow velocity was increased to U<SUB>a</SUB> ≥ 0.5 m/s, the shape of the C<SUB>a</SUB> distribution flattened, and C’ reduced gradually in the flow direction. The results related to the non-uniformity of fiber concentration demonstrated that the divergent tube is suitable for use in a tube-bank channel of the headbox of a papermaking machine.

목차

Abstract
1. Introduction
2. Experimental Apparatus and Procedures
3. Results and Discussion
4. Conclusions
References

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