Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/123718
Title: PRE-SET COUNTER-ROTATING STREAMWISE VORTICES IN WAVY CHANNEL
Authors: ALEXANDER CHRISTANTHO BUDIMAN
Keywords: Counter-rotating streamwise vortices, laminar boundary-layer flow, wavy channel, flow visualization, Particle Image Velocimetry, Hot-wire Anemometry
Issue Date: 15-Jan-2016
Source: ALEXANDER CHRISTANTHO BUDIMAN (2016-01-15). PRE-SET COUNTER-ROTATING STREAMWISE VORTICES IN WAVY CHANNEL. ScholarBank@NUS Repository.
Abstract: Development of counter-rotating streamwise vortices in rectangular channel with one-sided wavy surface has been experimentally investigated by means of smoke-wire flow visualization technique and Particle Image Velocimetry (PIV) as well as Hot-Wire Anemometry. The counter-rotating vortices are induced by a zig-zag pattern carved at the leading edge of the wavy surface in order to pre-set uniform size vortices so to prevent any difficulty and bias in studying its characteristics. The development of the most amplified disturbances can be attributed to the formation of mushroom-like structures across the spanwise plane. From the evaluation of the streamwise velocity profiles, turbulent intensity, and iso-shear contours, it is shown that the size and shapes of the vortex structures depend mainly on the Reynolds number, channel entrance geometry, and the channel gap. Compared to the parallel flat channel, the presence of wavy surface prevents the induced vortices to breakdown earlier.
URI: http://scholarbank.nus.edu.sg/handle/10635/123718
Appears in Collections:Ph.D Theses (Open)

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