Heat transfer characteristics of impinging air jets under a fixed pumping power condition

✍ Scribed by Kyo Sung Choo; Sung Jin Kim

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 679 KB
• Volume: 53
• Category: Article
• ISSN: 0017-9310
• DOI: 10.1016/j.ijheatmasstransfer.2009.09.027

✦ Synopsis

Heat transfer characteristics of an impinging air jet are experimentally investigated under a fixed pumping power condition. The effects of dimensionless pumping power ðP Ã pump ¼ 1:4 Â 10 10 -6:7 Â 10 12 Þ on the Nusselt number are considered. The focus is on cases where the nozzle-to-plate spacing is equal to or less than one nozzle diameter (H/d 6 1.0). The results show that the Nusselt number is independent of the nozzle-to-plate spacing under fixed pumping power conditions, while the Nusselt number increases with decreasing the nozzle-to-plate spacing under fixed flow rate conditions. Based on the experimental results, new correlations for the stagnation and average Nusselt numbers of the impinging jet are developed as a function of the pumping power alone.