A new look at natural convection from isothermal vertical parallel plates
- Univ. of Akron, OH (United States). Dept. of Mechanical Engineering
Natural convection between isothermal plates is solved numerically by applying the full Navier-Stokes equations. The elliptic formulation allows separating the effect of the Rayleigh number, Ra, and the aspect ratio, L/B. Calculations are made on a wide range of the Rayleigh number and the aspect ratio, and the Nusselt number is provided as a function of both Ra and B/L. The conventional correlations in the literature presenting the Nusselt number in terms of a single parameter, RaB/L, have been found inaccurate. At a small value of RaB/L, multiple values of Nusselt number are obtained for different combinations of Ra and B/L. Previous results are found to be the special cases of the present study. A minimum Rayleigh number is also obtained above which a fully-developed flow is possible. To simulate the natural convective flow, the ambient pressure is given at the exit while the pressure at the entrance is related to the ambient pressure by the Bernoulli equation. Velocities at the entrance and exit are also solved from the Navier-Stokes equations.
- OSTI ID:
- 445535
- Report Number(s):
- CONF-961105-; ISBN 0-7918-1520-X; TRN: IM9713%%271
- Resource Relation:
- Conference: 1996 international mechanical engineering congress and exhibition, Atlanta, GA (United States), 17-22 Nov 1996; Other Information: PBD: 1996; Related Information: Is Part Of ASME Heat Transfer Division: Proceedings. Volume 2: Heat transfer in turbulent flows; Fundamentals of convection heat transfer; Fundamentals of natural convection in laminar and turbulent flows; Natural circulation; HTD-Volume 333; Wroblewski, D. [ed.] [Boston Univ., MA (United States)]; Anand, N.K. [ed.] [Texas A and M Univ., College Station, TX (United States)]; Pletcher, R. [ed.] [Iowa State Univ., Ames, IA (United States)] [and others]; PB: 396 p.
- Country of Publication:
- United States
- Language:
- English
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