Such a high-speed water jet is generally produced by high-pressure gas, a piezo actuator, a metallic spring, or a falling or accelerated weight. High-speed water-jet techniques are extremely useful in broad industrial fields, for example, the cutting of metallic boards, wooden boards, concrete blocks, vegetables, and human organs 1, 2, 3. In addition, some characteristics of the presented PJI are observed, namely, (1) a very rapid piston displacement within 0.1 ms after a powder explosion, (2) piston vibration only when a large amount of powder is used, and (3) a pulse jet flow with a temporal pulse width of 0.1 ms. This clearly shows that a high-speed liquid-jet ejection velocity can be estimated using the presented FDM when considering the variation in liquid density but neglecting the liquid viscosity. Our results indicate that the liquid-jet ejection velocity estimated by the FDM corresponds to that predicted by ANSYS/FLUENT for several different ignition-powder weights. Using the FDM, we consider the liquid density variation but neglect the effects of the liquid viscosity on the liquid ejection. ![]() In addition, we propose a fluid dynamic model (FDM) for estimating the high-speed liquid-jet ejection velocity based on the piston velocity. To reproduce the piston motion during the numerical simulation, the boundary-fitted coordinates and a moving boundary method are employed. To gather the input data applied during the numerical simulation, the piston motion is captured with a high-speed CMOS camera, and the velocity of the piston is measured using motion tracking software. We apply a two-dimensional numerical simulation with an axisymmetric approximation using the commercial software ANSYS/FLUENT. Herein, we investigate the liquid ejection mechanism and a technique for estimating the ejection velocity of a high-speed liquid jet using a pyro jet injector (PJI). McKissock married his college sweetheart, Jill, and is the proud father of Dean, Cole and Luke.The high-speed liquid-jet velocity achieved using an injector strongly depends on the piston motion, physical property of the liquid, and container shape of the injector. He returned to Active Duty and graduated from the US Army’s Advanced Education in General Dentistry Program followed by an Endodontic Residency at Fort Bragg.ĭr. In 2002, he earned a DMD degree from the University of Florida College of Dentistry where he graduated on the Dean’s List with several patient care awards as well as the Omicron Kappa Upsilon Dental Honor Society’s Ethics Award. ![]() ![]() He is a Brown University graduate and former Army Scout Helicopter Pilot for the 1st Infantry Division and Multinational Force Observers in Egypt. He served seven years as the Endodontic Instructor for the Advanced Education in General Dentistry Residency at Fort Carson. McKissock has been practicing dentistry for 19 years and is a Board-Certified Endodontist and Diplomate of the American Board of Endodontics. The Elevation team worked tirelessly throughout the pandemic to provide safe, emergent dental care with compassion and leading-edge technology.ĭr. Elevation Endodontics opened in March 2020 just before COVID restrictions were enforced. McKissock is proud to be part of the Colorado Springs dental community and is humbled to be recognized as one of its top endodontists.
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