Virag, Zdravko and Živić, Marija and Krizmanić, Severino (2011) Cooling of a sphere by natural convection - The applicability of the lumped capacitance method. = Cooling of a sphere by natural convection - The applicability of the lumped capacitance method. International Journal of Heat and Mass Transfer, 54 (11-12). pp. 2303-2309. ISSN 0017-9310. Vrsta rada: ["eprint_fieldopt_article_type_article" not defined]. Kvartili JCR: Q1 (2011). Točan broj autora: 3.
Full text not available from this repository.Abstract
Two approaches to predicting the sphere cooling process by laminar natural convection were compared in terms of the accuracy of the volume averaged sphere temperature and the heat transfer rate between the sphere and the surrounding fluid. The first approach is based on the formulation of conjugate heat transfer (heat conduction in the sphere and laminar natural convection in the fluid). The second approach includes the lumped capacity method based on the assumption that the temperature in the sphere is spatially uniform and on the Churchill correlation function. The solution to the problem depends on the Rayleigh number (Ra), the Biot number (Bi), the Prandtl number (Pr), and the sphere-to-fluid thermal diffusivity ratio (A). The lumped capacitance method gives fairly accurate results with respect to the conjugate heat transfer method (discrepancy in the volume averaged sphere temperature less than 5) when A · Bi/Ra0.452 < 0.05, for Bi < 0.15 and Pr > 1. © 2011 Published by Elsevier Ltd.
| Item Type: | Article (["eprint_fieldopt_article_type_article" not defined]) |
|---|---|
| Keywords (Croatian): | Biot number; Capacitance method; Conjugate heat transfer; Cooling process; Correlation function; Heat transfer rate; Laminar natural convection; Rayleigh number; Sphere temperature; Capacitance; Cooling; Fluids; Natural convection; Temperature measurement; Spheres |
| Subjects: | TECHNICAL SCIENCE |
| Divisions: | 1400 Department of fluid mechanics > 1410 Chair of computer fluid mechanics |
| Indexed in Web of Science: | Yes |
| Indexed in Current Contents: | Yes |
| Quartiles: | Q1 (2011) |
| Date Deposited: | 22 Apr 2015 07:54 |
| Last Modified: | 05 Jun 2017 11:02 |
| URI: | http://repozitorij.fsb.hr/id/eprint/3814 |
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