Mechanical/Thermal Jet Surface Interactions in Paint Stripping Processes
Abstract
Several key accomplishments of this program are highlighted below: Experimental results for the two-phase flow were obtained on a full-scale production paint stripping system since this was the best way to assure that the relevant flow and system parameters were being considered. (1) Several key characteristics of two-phase nozzle flow have been characterized, including CO2 pellet sizing, distribution, velocity, sublimation and breakup. Initial results from a statistical analysis of this data is presented in the paper by Meade et al. (1997). The pellet breakup within the delivery system results in a reduction in the pellet size and an increase in number density. (2) Detailed flow visualization and surface static pressure distributions within a very high aspect ratio rectangular jet have been acquired. Pressure distributions were mapped both with and without CO2 pellets. Sublimation of the pellets within the delivery system results in the nozzle operating at a higher pressure ratio than the baseline air only case. Gaseous CO2 concentration levels were characterized at the nozzle exit. (3) Navier-Stokes simulations of internal nozzle flow were completed and estimates of particle trajectories were obtained by post-processing the steady-state flow solutions, using an analytical model for the particle drag. (4) Supporting diagnostic efforts led to the development of a new two-camera PIV technique and initial application to two-phase jet flow (Pothier et al., 1997). (5) To provide a suitable actuator for control of this class of particle laden flows, development of a novel piston-cylinder synthetic jet actuator capable of producing supersonic peak velocities was initiated. An isentropic model to predict the time-dependent pressure in the cylinder for use in optimizing the actuator design was formalized and validated.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 14, 1998
- Accession Number
- ADA352238
Entities
People
- A. Glezer
- C Rogers
- Diptiben Parekh
- L. Meade
- T. Crittenden
Organizations
- Phantom Works