Abonnement à la biblothèque: Guest
Portail numérique Bibliothèque numérique eBooks Revues Références et comptes rendus Collections
Computational Thermal Sciences: An International Journal
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 0.7

ISSN Imprimer: 1940-2503
ISSN En ligne: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.2013006557
pages 389-400

INFLUENCE OF GOERTLER VORTICES SPANWISE WAVELENGTH ON HEAT TRANSFER RATES

Vinicius Malatesta
Laboratory of Applied Mathematics and Scientific Computing, Department of Applied Mathematics and Statistics, ICMC - University of Sao Paulo, Sao Carlos, Sao Paulo; Mobility Engineering Center, Federal University of Santa Catarina, Santa Catarina, Brazil
L. F. Souza
Laboratory of Applied Mathematics and Scientific Computing, Department of Applied Mathematics and Statistics, ICMC - University of Sao Paulo, Sao Carlos, Sao Paulo, Brazil
Joseph T. C. Liu
School of Engineering and Center of Fluid Mechanics, Brown University, Providence, RI

RÉSUMÉ

The boundary layer over concave surfaces can be unstable due to centrifugal forces, giving rise to Goertler vortices. These vortices create two regions in the spanwise direction−the upwash and downwash regions. The downwash region is responsible for compressing the boundary layer toward the wall, increasing the heat transfer rate. The upwash region does the opposite. In the nonlinear development of the Goertler vortices, it can be observed that the upwash region becomes narrow and the spanwise−average heat transfer rate is higher than that for a Blasius boundary layer. This paper analyzes the influence of the spanwise wavelength of the Goertler the heat transfer. The equation is written in vorticity-velocity formulation. The time integration is done via a classical fourth-order Runge-Kutta method. The spatial derivatives are calculated using high-order compact finite difference and spectral methods. Three different wavelengths are analyzed. The results show that steady Goertler flow can increase the heat transfer rates to values close to the values of turbulence, without the existence of a secondary instability. The geometry (and computation domain) are presented.


Articles with similar content:

THE INFLUENCE OF SPANWISE WAVELENGTH OF GÖRTLER VORTICES IN HEAT TRANSFER
ICHMT DIGITAL LIBRARY ONLINE, Vol.0, 2012, issue
Leandro F. de Souza, Joseph T. C. Liu, Vinicius Malatesta
Some effects of Görtler flow secondary instabilities in the heat transfer
ICHMT DIGITAL LIBRARY ONLINE, Vol.0, 2015, issue
Leandro F. de Souza, Vinicius Malatesta
HYDRODYNAMIC AND THERMAL ANALYSES IN A BOUNDARY LAYER FLOW OVER A CONCAVE/CONVEX PLATE
Second Thermal and Fluids Engineering Conference, Vol.26, 2017, issue
Leandro F. de Souza, Josuel Kruppa Rogenski, Larissa Ferreira Marques
THE EVOLUTION OF A SHEARED REGION BETWEEN TWO CONTINUOUSLY STRATIFIED LAYERS
TSFP DIGITAL LIBRARY ONLINE, Vol.6, 2009, issue
Hieu T. Pham, Sutanu Sarkar, Kyle A. Brucker
STABILIZATION OF SUBCRITICAL BYPASS TRANSITION IN THE LEADING-EDGE BOUNDARY LAYER BY SUCTION
TSFP DIGITAL LIBRARY ONLINE, Vol.8, 2013, issue
Leonhard Kleiser, Michael O. John, Dominik Obrist