Heat transfer to impinging round jets with triangular tabs

✍ Scribed by N Gao; H Sun; D Ewing

• Book ID: 104135792
• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 526 KB
• Volume: 46
• Category: Article
• ISSN: 0017-9310
• DOI: 10.1016/s0017-9310(03)00034-6

✦ Synopsis

Experiments were performed to characterize the heat transfer enhancement produced by adding arrays of triangular tabs to the exit of turbulent round impinging jets issuing from a long pipe. For small nozzle-to-plate distances the local heat transfer was increased more than 25% in a series of distinct regions surrounding the impingement region. The largest increase in the average Nusselt number occurred for a nozzle-to-plate distance of approximately 4 diameter. In this case, the average Nusselt number was increased by 20% for the impingement region but only approximately 10% for the region with a radius of 3 jet diameters. Measurements of the velocity field were performed in free jets with tab arrays to investigate how the tabs modify the development of the flow.