Heat Transfer Enhancement for Laminar Flow in Circular Tubes with Twisted-Tape Inserts
| Autor: | Yasser Aldali, K. Morad, Ibrahim Elbaba |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Fluid Flow and Transfer Processes
Natural convection Materials science Turbulence Mechanical Engineering Heat transfer enhancement education Aerospace Engineering Reynolds number Laminar flow Heat transfer coefficient Mechanics Condensed Matter Physics Nusselt number Physics::Fluid Dynamics symbols.namesake Space and Planetary Science symbols Fanning friction factor Computer Science::Formal Languages and Automata Theory |
| Zdroj: | Journal of Thermophysics and Heat Transfer. 29:805-811 |
| ISSN: | 1533-6808 0887-8722 |
| DOI: | 10.2514/1.t4534 |
| Popis: | This paper presents the results of a comprehensive study of heat transfer and pressure drop for the laminar flow of water in circular tubes with twisted-tape inserts. Three different twist ratios and tape thicknesses were considered. Experiments were performed for two different tube diameters with Reynolds numbers ranging from 500 to 2200 under constant-wall-temperature boundary condition. The fully developed Nusselt number and friction factor were found to be influenced by the twist ratio and the tape thickness-to-diameter ratio. The Nusselt number increases with a decreasing twist ratio, increasing tape thickness, and increasing Reynolds number; whereas the friction factor increases with an increasing twist ratio and tape thickness. Correlations for the Nusselt number and friction factor are developed for a tube with inserted-tape inserts. The present correlations consider the effects of the tape thickness-to-diameter ratio and the twist ratio on the Nusselt number and friction factor. The thermal-hydra... |
| Databáze: | OpenAIRE |
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