Laser Doppler velocity measurements were performed on the entry flow of a strongly curved tube with the parabolic entry profile, in which a maximum curvature ratio, defined as the ratio of tube radius to the radius of curvature a/R, achieved is 1/2 . Both axial and secondary velocities were measured, describing the fairly complete flow field. Intensified curvature effects cause the secondary flow, and the maximum secondary flow velocity went up to 90% of the cross-sectional averaged axial velocity in the curved tube with a/R = 1.2. Due to this enhanced secondary flow, separation of secondary flow is found near the inner wall.
|Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
|Published - 1991 3月
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