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|Title:||Study of the most Amplified Wavelength Gortler Vortices||Authors:||TANDIONO||Keywords:||Gorter vortices, Concave surface, Boundary layer flow, Flow instability, Wall shear stress, Hot-wire anemometer||Issue Date:||12-Aug-2009||Citation:||TANDIONO (2009-08-12). Study of the most Amplified Wavelength Gortler Vortices. ScholarBank@NUS Repository.||Abstract:||The characteristics of the boundary layer in the presence of the most amplified wavelength Gortler vortices were investigated. The vortex wavelengths were pre-set or forced by a series of vertical perturbation wires placed prior and perpendicular to the leading edge. The pre-set wavelengths were found to preserve downstream.All data of maximum disturbance amplitude, which is used to quantify the vortex growth rate, obtained from the same experimental set-up seem to lie on a single line when they are plotted against Gortler number, regardless of the values of free-stream velocity and concave surface radius of curvature. The secondary instability is initiated near the boundary layer edge when the flow is sufficiently nonlinear.The spanwise-averaged wall shear stress initially follows the Blasius curve at the linear region. Further downstream, it increases well above the local turbulent boundary layer value due to the nonlinear effect of Gortler instability and the secondary instability modes.||URI:||http://scholarbank.nus.edu.sg/handle/10635/16821|
|Appears in Collections:||Ph.D Theses (Open)|
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