Steven H. Collicott, S. Zhang, and S. P. Schneider, "Quantitative Liquid Jet Instability Measurement System Using Asymmetric Magnification and Digital Image Processing," Experiments in Fluids, V. 16, No. 5, pp. 345-347. April 1994.

S. Zhang, S. P. Schneider and Steven H. Collicott, "Quantitative Molecular-Mixing Measurements Using Digital Image Processing of Absorption Images," Experiments in Fluids, V.19, No. 5, September, 1995, pp. 319-327.

Steven H. Collicott, Y. Chen, and S.D. Heister, "Cavitating Slot Flow: 2-D Modeling and Experiments", ILASS-Americas, May 19-22, 1996. 5 pages.

Mark Henry and Steven H. Collicott, "Internal Structure of Cavitating Slot Flow", ILASS-Americas, May 1997. 5 pages.

H. Li, P., K. Sanchez, and Steven H. Collicott, "Visualization of Cavitation in Low-Pressure Miniature Slot Flows," Institute for Liquid Atomization and Sprays-Americas, Sacremento, CA, May 1998. 5 pages.

R. Bunnell, C. Yen, S. D. Heister, and Steven H. Collicott, "Numerical Modeling of Cavitating Slot Flows," Institute for Liquid Atomization and Sprays-Americas, Sacramento, CA, May 1998. 5 pages.

Professor Collicott’s NSF CAREER award is clear and significant recognition of his achievements and promise in the field of spray orifice flows. Beginning August 1, 1995, this coveted award funds research to invent methods to view and quantify the cavitating flow within orifice flows. The motivation for these studies ranges from relatively low-pressure coatings sprays up to high-pressure fuel injectors for diesel engines. We have built an ingenious facility to image and measure these complex flows at true scale: the two-phase unsteady flow inside 0.008 inch diameter holes with up to 30,000 psi (2000 atmospheres) driving pressure. True scale and pressure conditions are required for the cavitating flows because there is no way to scale up these flows and retain all relevant thermodynamic and fluid dynamic properties. In another rig nearly four orders of magnitude distant (4 psi driving pressure) this research has also imaged cavitation inside even smaller orifices typical of ink-jet printers.

The measurements from these experiments coordinate with Professor Heister’s efforts to develop dependable computer models of small length-scale cavitation and spray orifice internal flows. Other measurements, such as in the flow passages leading to the orifices can surpass the state-of-the-art of numerical calculations by a sizable margin. These will build an empirical database presently unavailable to spray system designers.

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