| Titre : | An experimental study into the evaporation heat transfer and flow characteristics of R-134a refrigerant flowing through corrugated tubes (2011) |
| Titre original : | Etude expérimentale sur le transfert de chaleur lors de l'évaporation et les caractéristiques d'écoulement du frigorigène R-134a en écoulement à l'intérieur de tubes ondulés |
| Auteurs : | Suriyan Laohalertdecha, Auteur ; Somchai Wongwises, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | International journal of refrigeration (Vol. 34 N° 1, Janvier 2011) |
| Article en page(s) : | pp. 280-291 |
| Note générale : | Génie Mécanique |
| Langues : | Anglais |
| Index. décimale : | 621.5 (Energie pneumatique. Machinerie et outils. Réfrigération) |
| Tags : | Two-phase flow Pressure Temperature R-134a Heat transfer enhancement Corrugated tube |
| Résumé : | The effects of corrugation pitch on the evaporation of R-134a flowing inside horizontal corrugated tubes are investigated. The test section is a tube-in-tube heat exchanger with refrigerant flowing in the inner tube and hot water flowing in the annulus. Smooth and corrugated tubes having similar inside diameters are used as the inner tube. Three corrugated tubes having a corrugation depth fixed at 1.5 mm and corrugation pitches of 5.08, 6.35 and 8.46 mm are examined. The data obtained from smooth tube are plotted and compared with the flow pattern map established by Censi et al. (2003) and Zurcher et al. (2002). The effects of average vapour quality, equivalent Reynolds number and corrugation pitch are discussed. The maximum ratios of heat transfer enhancement factor to pressure drop penalty factor (Nuc/Nus)/((ΔP/L)c/(ΔP/L)s) is approximately 1.2. |
| DEWEY : | 621.5 |
| ISSN : | 0140-7007 |
| En ligne : | http://www.sciencedirect.com/science/article/pii/S0140700710001581 |
