Flow visualization and measurements in a two-dimensional two-impinging-jet flow

Abstract

This paper presents the results of an experimental study of the flowfield characteristics of the interaction of two two-dimensional jets impinging against a normal ground plane. The flowfield was observed visually using oil-flow patterns. Measurements of turbulence and averaged velocities in the flowfield were performed. Parameters included in this investigation were the distance from the ground plane and the jet relative strength. The response of the flowfield to the variation in these parameters has been characterized. Increasing the distance between the jet exit plane and the ground plate, the developed stagnation pressure in the upwash formation region exceeds those corresponding to the jet central streamline. It is found that, in a two-impinging-jet flow, the rate of jet decay is higher than that for a single jet.

An experimental investigation on the interaction of hydraulic jumps formed by two normal impinging circular liquid jets

“…The fountain, located midway between the nozzles, moves upward and spreads spatially by entraining the surrounding fluid (Saripalli 1983). Air entrained by the two jets causes a subatmospheric region between the two nozzles and there is an attraction between the two jets, causing their axes to curve and eventually merge, forming a single jet (Elbanna & Sabbagh 1989). If the upwash flow comes close to the free jet, a recirculation of the upwash flow can occur (Siclari et al 1981); this has been visualized experimentally by several investigators (Siclari et al 1997;Adarkar & Hall 1969).…”

Wall jets created by single and twin high pressure jet impingement

“…Firstly, the jets will tend to "attract" each other. Elbanna and Sabbagh* 22 ' comment on this feature for low pressure cases. Secondly, the circumferential variation of static pressure around each jet before impingement will create circumferential flows.…”

Jet‐Impingement Heat Transfer in Gas Turbine Systems

“…When L/D = 2, local maximum points between the jets can be observed, which come from upwash stagnation formed by the spent air. A flow visualization study on the interaction between two impinging jets was carried out by Elbanna and Sabbagh 39…”