Accession Number:

ADA160326

Title:

Turbulent Noncondensing and Condensing Gas Jets in Liquids.

Descriptive Note:

Final rept. 15 Dec 84-31 Jul 85,

Corporate Author:

PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF MECHANICAL ENGINEERING

Report Date:

1985-08-01

Pagination or Media Count:

43.0

Abstract:

Gas injection into liquids is a fundamental multiphase flow which has several direct applications, e.g., stored chemical energy propulsion systems SCEPS, direct-contact condensers, gas dissolution systems, reservoir destratification systems and nuclear-reactoar pressure suppression systems. Stability of these flow is enhanced when an underexpanded jet is used therefore, the interaction of supersonic wave structures with liquids in turbulent flow is also an issue. The objective of this phase of the study was to develop test apparatus relating to underexpanded air jets in air and turbulent subsonic gas jets in liquids. The air-jet-in-air apparatus was assembled and flow visualization tests were completed using continuous and spark Schlieren photography. Test apparatus for gas injection in liquids was assembled. Tests were also undertaken to study injector stability. Test results showed that jet instability for subsonic adapted flow could be controlled by placing a screen across the jet exit and controlling gas release at the surface or the bath which can cause undesirable pressure fluctuations in the bath. For stable jets, the liquidgas interface is continous near the jet exit and its position is influenced by the degree of underexpansion. A bubble cloud was observed near the interface, and it is also probable that a drop cloud in present as well. Analysis of this flow for subsonic jet exit conditions was implemented using the locally homogeneous flow approximation of multiphase flow. Keywords Exhaust plumes Compressible turbulent jets.

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE