The gas-only flow in a close-coupled, gas-metal atomizer is Studied to determine the influence of operational parameters on The structure of the flow field. A parametric study is conducted to determine the effects of jet exit pressure ratio, jet temperature ratio, and base mass-injection on the flows. Comparisons between Schlieren images and numerical results are found to be in good qualitative agreement; the numerical method predicted the experimental values of base pressure, however, only within 10-20% of the experimental values. Results from the pressure ratio study led to a description of the observed base-pressure behavior on the basis of the resulting jet structure. The temperature ratio results indicated that the industrial practice of gas-heating may be detrimental to the atomization process due to a global reduction of the momentum of the gas flow field . The flow fields obtained with base mass-injection exhibited flow structures similar to those seen in high-speed studies of the liquid metal disruption process. The introduction of mass to the base of the flow has little impact on the flow structure of the surrounding gas flow field.
Proceedings Title: 1998 Powder Metallurgy World Congress and Exhibition
Conference Dates: November 8-13, 1998
Conference Location: Granada,
Pub Type: Conferences
aspiration, atomization, base, flow, gas, metal, numerical, simulation