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Numerical Study on the Turbulent Flow in the $180^\circ$ Bends increasing Cross-sectional Aspect Ratio  

김원갑 (세종대학교 록히드마틴 항공우주연구소)
김철수 (원주대학 자동차 서비스)
최영돈 (고려대학교 기계공학과)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.16, no.9, 2004 , pp. 804-810 More about this Journal
Abstract
This paper reports the characteristics of the three dimensional turbulent flow by numerical method in the 180 degree bends with increasing cross-sectional area. Calculated pressure and velocity, Reynolds stress distributions are compared to the experimental data. Turbulence model employed are low Reynolds number $textsc{k}$-$\varepsilon$ model and algebraic stress model(ASM). The results show that the main vortex generated from the inlet part of the bend maintained to outlet of the bend and vortices are continually developed at the inner wall region. The distribution of turbulent kinetic energy along the bend are increase up to 120$^{\circ}$ because of increment of cross-sectional area. Secondary flow strength of the flow is lower about 60% than that of square duct flow.
Keywords
Duct flow; Reynolds stress; Turbulence model; Contravariant velocity component;
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[ Kim, W.K. ] / Ph.D thesis, KOREA University
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