Calculation of vent losses in a parallel wall channel undergoing natural convection motion
Book
·
OSTI ID:509291
- Old Dominion Univ., Norfolk, VA (United States)
The natural convection heat transfer and ventilation characteristics of heated and vented parallel wall channels have been studied numerically. The flow is assumed to be laminar and steady, and the governing Navier-Stokes equations in two-dimension are solved by a finite volume formulation to calculate the chimney effect that draws cooler ambient air from the lower opening. The fluid dynamical and heat transfer characteristics of vented vertical channels are investigated for Rayleigh number ranging from 10{sup 3} to 10{sup 5}. The non-dimensional entrance and exit pressure losses, and mass flow rate are correlated with Rayleigh number. The results indicate that although inlet and exit losses coefficients may vary significantly with Rayleigh number, the total pressure loss coefficient is a weak function of Rayleigh number, showing only a broad minimum at Rayleigh number equal to 8,000 and 10,000 for aspect ratios 10 and 20 respectively. However, for the case with aspect ratio of five, the total pressure loss coefficient is a monotonically increasing function of Rayleigh number. The non-dimensional mass flow rate induced by chimney effect also shows a maximum value around the same value of Rayleigh number. The results, obtained from present procedure were compared with boundary layer as well as Oseen flow calculations of previous authors. Numerical experimentations also yielded important information regarding the placement of free pressure boundary. The results for present geometry indicate that the effect of free boundary location is negligible if it is placed at a distance of four times the width or greater. These flows have significant potential for applications in material processing, electronic equipment design, building heat transfer problems, thermo-syphon technology and solar collectors such as the Trombe Wall.
- OSTI ID:
- 509291
- Report Number(s):
- CONF-950828--; ISBN 0-7918-1702-4
- Country of Publication:
- United States
- Language:
- English
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