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KMID : 0372919960170040515
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Journal of Biomedical Engineering Research
1996 Volume.17 No. 4 p.515 ~ p.524
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A Study on Characteristics of Unsteady Laminar Flows in Squaresectional 180° Curved Duct
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Abstract
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The flow characteristics of developing unsteady laminar flow in a square-sectional 180" curved duct are experimentally investigated by using laser doppler velocimerty (LDV) system with data acquisition and processing system of rotating machinery resolver(RMR) and PHASE software. The major flow characteristics of developing laminar pulsating flows are presented by mean velocity profilel velocity distribution of secondary flow, wall shear stress distributions, entrance lengths according to dimensionless angular frequency( ), velocity amplitude ratio(A ), and time-averaged Dean number(De ). The velocity profiles and wall shear stress distribution of laminar pulsating flow with dimensionlessangular frequency show the flow characteristics of the quasi-steady laminar flow in a curved duct. The developing region of laminar pulsatile flows in a square-sectional 180° curved duct is extended to the curved duct angle of approximately 120° under the present experimental condition.
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