A general correlation for laminar natural convection heat transfer from single horizontal cylinders in liquids and gases with all possible Prandtl numbers
- Kyoto Univ., Uji, Kyoto (Japan). Inst. of Atomic Energy
The natural convection heat transfer coefficients on single horizontal cylinders with uniform surface heat fluxes were derived numerically from the fundamental equations for laminar natural convection heat transfer by finite difference method without the boundary layer approximation for a wide range of Rayleigh numbers for the Prandtl numbers ranging from 0.005 to 3000. Based on the numerical solutions for the Prandtl numbers, a correlation which describes the numerical solutions of the average Nusselt numbers for the investigated Prandtl numbers within {+-}5 percent is presented. The average Nusselt numbers calculated from the correlation are compared with the experimental results for various fluids with the Prandtl numbers ranging from 0.005 to about 18000 obtained by the authors and by other workers: the authors` experimental results for various liquids such as water, ethanol, glycerin, liquid sodium, liquid nitrogen and liquid helium obtained under a wide range of bulk liquid temperatures and system pressures with a variety of cylinder diameters agree with the correlation within {+-}20 percent differences when the fluid properties are evaluated at the reference temperature.
- OSTI ID:
- 458420
- Report Number(s):
- CONF-951135-; ISBN 0-7918-1751-2; TRN: IM9717%%206
- Resource Relation:
- Conference: 1995 International mechanical engineering congress and exhibition, San Francisco, CA (United States), 12-17 Nov 1995; Other Information: PBD: 1995; Related Information: Is Part Of Proceedings of the ASME Heat Transfer Division. Volume 1: Benchmark problems of heat transfer analysis programs; High heat flux thermal management; Modeling of heat transfer in multi-phase systems; Natural and mixed convection; Numerical methods in heat exchanger design; HTD-Volume 317-1; Cochran, R.J.; Hogan, R.E. [eds.] [Sandia National Lab., Albuquerque, NM (United States). Engineering Sciences Center]; Khounsary, A.M. [ed.] [Argonne National Lab., IL (United States)] [and others]; PB: 484 p.
- Country of Publication:
- United States
- Language:
- English
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