Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 0-85295-345-3

International Heat Transfer Conference 10
August, 14-18, 1994, Brighton, UK

AN INTERFEROMETRIC AND NUMERICAL STUDY OF FREE AND MIXED CONVECTIVE HEAT TRANSFER FROM OPEN V-SHAPED CAVITY

Get access (open in a dialog) DOI: 10.1615/IHTC10.3410
pages 561-566

Abstrakt

Steady, laminar, free and mixed convective flows over an open V-shaped cavity situated in the bottom wall of a rectangular duct have been investigated numerically using a higher order finite difference technique, and experimentally by the use of a Mach-Zehnder interferometer. Results are presented for Prandtl number of 0.7. For the free convection, results are presented for Rayleigh number (defined as Ra = Gr × Pr where Gr = gβ(Tw - T)w3 /v2 and Pr = v/α) of 5.0×l05, and for the mixed convection, Reynolds number of 400 and Gr/Re2 up to 4.46 were considered. All dimensionless numbers were based on the aperture width, w, of the open V-shaped cavity. In the experimental study, the angle of inclination (or rotation about the z-axis) of the cavity was varied from 0° to 45°. Flow and temperature maps, velocity and temperature profiles, as well as the local and average heat transfer rates were presented. In free convection, no formation of secondary vortices was observed, however, secondary vortices were observed in mixed convection for the parameters covered in this study. The shear layer across the aperture of the V-shaped cavity in mixed convection caused a low velocity air region to form inside the cavity and this may be responsible for the lower average Nu in mixed than in free convection.