Flow of Dilute Polymer Solutions Through Curved Pipes : 2nd Report, Pressure Loss in 360°Bends
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概要
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Experiments on flows of water and dilute aqueous solutions of polyethylene oxide are carried out in the Reynolds number range of 10^3 to 5× 10^4. Concentration of polymer solutions is varied from 1ppm to 100ppm. The ratios of curvature radius to pipe radius, R/a, are 18.7, 34.3 and 47.3. Measured pressure distributions along a bend axis are classified in three types by their patterns. Flow property of each pattern is clarified by using the method of flow visualization. Drag reduction in a bend flow is smaller than that in a straight pipe flow. Pressure loss coefficients are correlated with the Reynolds number, the ratio of radius R/a and the Weissenberg number. The empirical formulas presented for the bend loss coefficient are useful from an engineering viewpoint.
- 一般社団法人日本機械学会の論文
著者
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TOMITA Yukio
Faculty of Education, Hokkaido University of Education
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Tomita Yukio
Faculty Of Science And Technology Science University Of Tokyo
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YOKOYAMA Toshio
Faculty of Science and Technology, Science University of Tokyo
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Yokoyama Toshio
Faculty Of Science And Technology Science University Of Tokyo
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