Thermal Performance Assessment of Turbulent Tube Flow Through Wire Coil Turbulators
| Autor: | Pongjet Promvonge, Smith Eiamsa-ard, Vichan Kongkaitpaiboon |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Fluid Flow and Transfer Processes
Quantitative Biology::Biomolecules Materials science Convective heat transfer Turbulence Mechanical Engineering Heat transfer enhancement Physics::Medical Physics Thermodynamics Heat transfer coefficient Mechanics Condensed Matter Physics Turbulator Heat flux Electromagnetic coil Tube (fluid conveyance) |
| Zdroj: | Heat Transfer Engineering. 32:957-967 |
| ISSN: | 1521-0537 0145-7632 |
| DOI: | 10.1080/01457632.2011.556381 |
| Popis: | This paper presents characteristics of turbulent convective heat transfer in a tube fitted with wire coil turbulators. Two different wire coils are introduced: (1) with typical/uniform coil pitch ratio (CR) and (2) with periodically varying three-coil pitch ratio. Various uniform coil pitch ratios (CR = 4, 6, and 8) and two periodically varying coil pitch ratios, the D-coil (decreasing three-coil pitch ratio arrangement) and DI-coil (decreasing/increasing three-coil pitch ratio arrangement), are experimentally investigated in a uniform heat flux tube. The experiments are performed for turbulent flows with Reynolds numbers ranging between 4500 and 20,000. All of the experimental results are compared with those obtained from using the plain tube, while the thermal performance factor is evaluated under an equal pumping power constraint. The experimental results show that the use of the tube fitted with all wire coils leads to an advantage on the basis of heat transfer enhancement over the plain tube with no ... |
| Databáze: | OpenAIRE |
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