Civil and Environmental Engineering Publications
Genetic algorithm based correlations for heat transfer calculation on concave surfaces
Document Type
Article
Publication Date
2009
Journal
APPLIED THERMAL ENGINEERING
Volume
29
Issue
17-18
First Page
3476
URL with Digital Object Identifier
https://doi.org/10.1016/j.applthermaleng.2009.05.025
Last Page
3481
Abstract
Laboratory experiments were carried out on a boundary layer over a concave wall subject to Gortler instability in the presence of forced wavelengths. Measurements of the local heat transfer along the concave wall permit calculation of the local Stanton number St for various axial positions x, nominal velocity U-n, the wavelength lambda and strength d(w) of the forced initial perturbations. The relation among these variables was constructed by a phenomenological argument in the form of classical power law correlations: St = a(Re-theta)(b) (x/R)(c) (lambda/theta)(d). Correlations constants are then derived by genetic algorithm methods. The calculated Stanton number is in good agreement with the experimental results. In this paper we propose correlations for the calculation of heat transfer on concave surfaces (such as gas turbine blade pressure side) where the flow is complex due to the presence of streamwise vortices. (C) 2009 Elsevier Ltd. All rights reserved.