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Proceedings of CHT-12. ICHMT International Symposium on Advances in Computational Heat Transfer.
July, 1-6, 2012, Bath, England

DOI: 10.1615/ICHMT.2012.CHT-12


ISBN: 978-1-56700-303-1

ISSN: 2578-5486

THE INFLUENCE OF SPANWISE WAVELENGTH OF GÖRTLER VORTICES IN HEAT TRANSFER

pages 575-590
DOI: 10.1615/ICHMT.2012.CHT-12.350
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RESUMO

The increase in heat transfer rates aiming efficient systems is one of the goals in convection heat transfer exchangers. The boundary layer over concave surfaces can be unstable to centrifugal forces, giving rise to Görtler vortices. These Vortices create two regions in the spanwise direction, the upwash and downwash regions. The downwash region is responsible to compress the boundary layer in the direction of the wall, increasing the heat transfer rate. The upwash region does the opposite. In the nonlinear development of the Görtler vortices it can be observed that the upwash region becomes narrow, and the average heat transfer rate is higher than that for a Blasius boundary layer. In the present paper it is analysed the influence of the Görtler vortices spanwise wavelength in the heat transfer. The paper is carried out by a Spatial Direct Numerical Simulation. The Navier-Stokes equation is written in vorticity-velocity formulation. The time integration is done via a classical 4th order Runge-Kutta method. The spatial derivatives are calculated using high-order compact finite difference and spectral methods. Three different wavelengths were analysed. The results shows that steady Görtler flow can increase the heat transfer rates to values above the turbulent values.

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