Abstract
Impinging jets are one of the most industrially essential techniques for cooling the gas turbine blades and electronic devices, drying glasses, anneal and so on. Usually, multiple jets are arranged for appropriate cooling, but they make complicated flow by interaction with each other at near the impingement surface. In the present study, complicated three-dimensional flow configuration of square arrayed circular impinging jets was revealed experimentally for referring to the effect on heat transfer performance. The flow field was measured by scanning stereoscopic particle image velocimetry to confirm the detailed spatial features of the jet interaction as changing nozzle-to-surface distance and jet-to-jet spacing. In this occasion, it is confirmed that the adjacent jets configure the distorted rings which surrounds jets. The large upward roll-up that is also indicated.
