Visualization of the flow field in a confined and submerged impinging jet

Conference · Tue Jul 01 04:00:00 EDT 1997

OSTI ID:20014365

Fitzgerald, J A; Garimella, S V

The high heat transfer rates that can be obtained through the use of jet impingement cooling have led to its use in a variety of applications, including paper drying, glass manufacturing, turbine-blade cooling, and electronics cooling. Here, the flow field of a normally impinging, axisymmetric, confined and submerged liquid kit is studied using flow visualization. The results are compared with computations and experimental measurements of the flow field, and are used to describe the position of the recirculating toroid in the outflow region which is characteristic of the confined flow field. Changes in the features of the recirculation pattern due to changes in Reynolds number, nozzle diameter and nozzle-to-target plate spacing are documented. Results are presented for nozzle diameters of 3.18, 6.35, and 12.7 mm, at jet Reynolds numbers in the range of 2,000 to 23,000, and nozzle-to-target plate spacings of 1, 2, 3, and 4 jet diameters. Up to three interacting vertical structures are observed in the confinement region at the smaller Reynolds numbers. The center of the primary recirculation pattern moves away from the centerline of the jet with an increase in Reynolds number, nozzle diameter, and nozzle-to-target plate spacing. As the recirculating toroid moves away from the jet axis, more of the ambient fluid is entrained into the confinement region.

• Research Organization: Univ. of Wisconsin, Milwaukee, WI (US)
• Sponsoring Organization: National Science Foundation
• OSTI ID: 20014365
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
COOLING
EXPERIMENTAL DATA
FLOW VISUALIZATION
FLUID FLOW
HEAT TRANSFER
IMPINGEMENT
JETS
NOZZLES