Impingement Cooling by Multiple Asymmetric Orifice Jets

Autor:	C. Y. Zhang, Y. Y. Liu, T. I. Bhaiyat, S. W. Schekman, T. J. Lu, T. Kim
Rok vydání:	2022
Předmět:	Physics::Fluid Dynamics Mechanics of Materials Astrophysics::High Energy Astrophysical Phenomena Mechanical Engineering General Materials Science Condensed Matter Physics
Zdroj:	Journal of Heat Transfer. 144
ISSN:	1528-8943 0022-1481
DOI:	10.1115/1.4053330
Popis:	This study presents impingement cooling from a flat plate by multiple asymmetric jets. Such jets are discharged through blunt-edge inline orifice holes with a thickness-to-diameter ratio of t/Dj = 0.5 and a jet-to-jet spacing of T/Dj = 4.0, at the Reynolds number of 20,000. First, fluidic features are established both in free exit and with impingement, at varying short target spacing (e.g., H/Dj ≤ 4.0). Second, thermal characteristics of the jet impingement are elucidated. Results demonstrate that, due to a skewed incidence of the coolant stream upstream of concave orifice holes, the resulting multiple orifice jets are asymmetric and skewed relative to the orifice axis. These results mimic multiple fluidically inclined jets. However, asymmetric entrainment that takes place causes faster mixing with the surrounding fluid at rest as well as faster decay of momentum. This shows more effective cooling from a flat plate for the relatively short H/Dj range than conventional symmetric orifice and nozzle jets.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8649a73717d79b8d57077e075091d323 https://doi.org/10.1115/1.4053330 Zobrazit plný text záznamu