INVESTIGATION OF JET TRANSITION PHENOMENA.
Final rept. 1 Jun 67-31 May 68,
MARTIN MARIETTA CORP ORLANDO FLA ORLANDO DIV
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The experimental investigation examines jet phenomena, gaseous and liquid, in small submerged and bounded jets. Its general objectives are to acquire experimental data and to develop mathematical expressions for predicting the behavior of fluidic elements and designs. Data are presented for circular nozzles of 0.25 to 4.6 mm and square nozzles of 0.5 to 1.0 mm, observed by Schlieren and Birefringent flow techniques at low Reynolds numbers compatible with miniature fluidic designs. Good correlation between compressible and incompressible flow is obtained. Three principal nondimensional terms are used to evaluate and correlate experimental results. They are Reynolds number, transition number a relationship of nozzle diameter and length of laminar flow, and momentum number represented the interaction of two jets. Three sets of tests are described. One measures the transition from laminar flow to turbulence in single submerged jets. The second introduces a secondary jet flow to determine its effect upon transition and deflection of the primary jet. The third involves variations of nozzle geometry commonly used in fluidic elements sidewall divergence, sidewall setback and reinjection curvature. These geometries provide feedback paths and reflecting surfaces, allowing the jet to produce premature transition. Author
- Fluidics and Fluerics