Heat transfer from a plate impinging swirl jet

✍ Scribed by Kadir Bilen; Kadir Bakirci; Sinan Yapici; Tahir Yavuz

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 472 KB
• Volume: 26
• Category: Article
• ISSN: 0363-907X
• DOI: 10.1002/er.785

✦ Synopsis

Heat transfer and #ow visualization experiments were conducted to investigate the performance of swirling and multi-channel impinging jets and compare the results with those of a multi-channel impinging jet (MCIJ) and conventional impinging jet (CIJ) for the present work at the same conditions. Swirling impinging jets (SIJs) employed the "xed blade lengths of 12.3 mm with four blades at the exit of the housing tube to divert the air #ow through four narrow channels with a desired swirl angle ( of 22.5, 41 and 503). The MCIJ jet had the same dimensions as the SIJs, except that the narrow channels in the solid insert were vertical ( "03). The local and surface average Nusselt numbers of MCIJ were generally higher than those of the CIJ and SIJs. The SIJs, however, demonstrated signi"cant improvement in radial uniformity of heat transfer compared to the MCIJ and CIJ. In the region of 2.7*X/D*0 for H/D"8 and Re"20 000, the average Nusselt number for the MCIJ was 11, 33, 72 and 98 per cent higher than that of the CIJ, "22.5, "41 and "503, respectively.