Flow field measurements in confined and submerged jet impingement
- Univ. of Wisconsin, Milwaukee, WI (United States). Dept. of Mechanical Engineering
The flow field of an axisymmetric, confined and submerged turbulent jet impinging normally on a flat plate was studied experimentally using laser-Doppler velocimetry. Single jets of a perfluorinated dielectric liquid (FC-77) were used in the experiments, with nozzle diameters of 3.18 and 6.35 mm, and nozzle-to-target plate spacings of up to 4 jet diameters. The experiments were conducted for turbulent jet Reynolds numbers in the range of 8,500 to 2,300. Velocity measurements just downstream of the nozzle exit show an increase in volume flow rate of 10--26% relative to the volume flow rate at the exit due to entrainment of the surrounding fluid. Very near the target plate, a maximum in the radial velocity is observed to occur at a radial distance from the stagnation point of 1 nozzle diameter. The location where transition to turbulence is observed in the wall jet is shown to move radially outward for increasing nozzle-to-target plate spacing, and lies between 2d and 2.5d for all cases. The flow field characteristics of the confined and submerged jets in the present study are contrasted to those reported in the literature for free-surface jets and submerged but unconfined jets.
- OSTI ID:
- 445527
- Report Number(s):
- CONF-961105--; ISBN 0-7918-1520-X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Orifice and impingement flow fields in confined jet impingement
Effect of nozzle configuration on transport in the stagnation zone of axisymmetric, impinging free-surface liquid jets: Part 1-turbulent flow structure