| Journal: | Journal of the Brazilian Society of Mechanical Sciences |
| Database: | PERIÓDICA |
| System number: | 000312025 |
| ISSN: | 0100-7386 |
| Authors: | Nieckele, Angela Ourivio1 Saboya, Francisco Eduardo Mourao2 |
| Institutions: | 1Pontificia Universidade Catolica do Rio de Janeiro, Departamento de Engenharia Mecanica, Rio de Janeiro. Brasil 2Universidade Federal Fluminense, Departamento de Engenharia Mecanica, Niteroi, Rio de Janeiro. Brasil |
| Year: | 2000 |
| Volumen: | 22 |
| Number: | 1 |
| Pages: | 119-132 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Analítico |
| English abstract | Experiments were performed to determine average heat transfer coefficients and friction factors for turbulent flow through annular ducts with pin fins. The measurements were carried out by means of a double-pipe heat exchanger. The total number of pins attached to the inner wall of the annular region was 560. The working fluids were air, flowing in the annular channel, and water through the inner circular tube. The average heat transfer coefficients of the pinned air-side were obtained from the experimental determination of the overall heat transfer coefficients of the heat exchanger and from the knowledge of the average heat transfer coefficients of the circular pipe (water-side), which could be found in the pertinent literature. To attain fully developed conditions, the heat exchanger was built with additional lengths before and after the test section. The inner circular duct of the heat exchanger and the pin fins were made of brass. Due to the high thermal conductivity of the brass, the small tube thickness and water temperature variation, the surface of the internal tube was practically isothermal. The external tube was made of an industrial plastic which was insulated from the environment by means of a glass wool batt. In this manner, the outer surface of the annular channel can be considered adiabatic. The results are presented in dimensionless forms, in terms of average Nusselt numbers and friction factors as functions of the flow Reynolds number, ranging from 13,000 to 80,000. The pin fin efficiency, which depends on the he |
| Disciplines: | Física y astronomía, Ingeniería |
| Keyword: | Termodinámica y física estadística, Ingeniería mecánica, Ingeniería química, Regiones anulares, Transferencia de calor, Caída de presión, Flujo, Turbulencia |
| Keyword: | Physics and astronomy, Engineering, Thermodynamics and statistical physics, Chemical engineering, Mechanical engineering, Annular regions, Heat transfer, Pressure drop, Flow, Turbulence |
| Full text: | Texto completo (Ver HTML) |
