Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/15745
Title: Generation of pre-set wavelength Gortler vortices
Authors: NEO CHEE TIONG, KELVIN
Keywords: perturbation needles, Görtler vortices, boundary layer,
Issue Date: 25-Dec-2006
Source: NEO CHEE TIONG, KELVIN (2006-12-25). Generation of pre-set wavelength Gortler vortices. ScholarBank@NUS Repository.
Abstract: The development of a??forceda?? wavelength G??rtler vortices in a laminar boundary layer flow generated over a concave test surface with 2.0 m radius of curvature has been investigated experimentally in the present study. Equally spaced finite length perturbation needles, instead of the conventional vertical wires, were used to pre-set the wavelengths of the vortices. Mean velocity measurements using a single hot-wire probe indicated that the new method is able to pre-set the wavelengths of G??rtler vortices for both free-stream velocities Ui?Y of 1.0 m/s and 3.0 m/s provided that the Reynolds Red, based on needle diameter and free-stream velocity, does not exceed a critical level. It was observed that the breakdown of vortices into turbulence occurred at a lower G??rtler number Gi?? for free-stream velocity Ui?Y of 3.0 m/s. The spanwise spacing between the needles was also varied to study the possible effects on the development of the G??rtler vortices.
URI: http://scholarbank.nus.edu.sg/handle/10635/15745
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