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http://dx.doi.org/10.3795/KSME-B.2004.28.9.1058

A Study on the Axial Velocity Profile of Developing Laminar Flows in a Straight Duct Connected to a Square Curved Duct  

Sohn, Hyun-Chull (조선대학교 기계공학과)
Lee, Haeng-Nam (조선대학교 기계공학과)
Park, Gil-Moon (조선대학교 기계공학과)
Lee, Hong-Gu (동아인재대학 치기공과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.28, no.9, 2004 , pp. 1058-1065 More about this Journal
Abstract
In the present study, characteristics of steady state laminar flows of a straight duct connected to a 180$^{\circ}$ curved duct were examined in the entrance region through experimental and numerical analyses. For the analysis, the governing equations of laminar flows in the Cartesian coordinate system were applied. Flow characteristics such as velocity profiles, and secondary flows were investigated numerically and experimentally in a square cross-sectional straight duct by the PIV system and a CFD code(STAR CD). For the PIV measurement, working fluid produced from mosquito coils smoke. The experimental data were obtained at 9 points dividing the test sections by 400 mm. Experimental and numerical results can be summarized as follows. Critical Reynolds number, Recr which indicates transition from laminar steady flow to transition steady flow was 2,150. As Reynolds number, Re, was increased, dimensionless velocity profiles at the outer wall were increased due to the effect of the centrifugal force and the secondary flows. The intensity of a secondary flow became stronger at the inner wall rather than the outer wall regardless of Reynolds number.
Keywords
Laminar Flow; CFD; PIV; Square Cross Sectional; Curved Duct; Mosquito Coils Smoke;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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