Waterjet technology involves complex flow phenomena, which include supersonic, turbulent, compressible, and three-phase interactions. This book, by the editor and colleagues, distills three decades of R&D expertise from Flow Industries, Inc. and OMAX Corp., based in Kent, Washington, USA. Organized into 10 sections and 32 chapters, it blends physical experiments and limited computational fluid dynamics analyses as R&D methodologies. Through flow visualization and probe measurement, the book characterizes waterjet geometry, water-droplet and abrasive speeds, surface roughness and edge qualities of machined parts, and more. It showcases advancements in micro abrasive-waterjet technology, recognized as a 2016 R&D 100 Awards finalist and honored with the 2016 Tibbitts Award from the U.S. Small Business Administration.

Peter H.-T. Liu earned his doctorate from Colorado State University, USA, in 1972 and boasts a distinguished 50-year career in experimental fluid dynamics and waterjet technology. He joined Flow Research/Flow Industries, Inc. in 1973 and spearheaded his R&D efforts in experimental fluid dynamics, focusing on qualitative and quantitative flow visualization for both laboratory and field investigations. Research topics spanned from naval hydrodynamics, turbulence in homogeneous and stratified fluids, transport of pollution in complex terrain, to wake studies of wind turbines and aircraft. Under the mentorship of Dr John H. Olsen, he transitioned his research focus in 1995 to waterjet technology, leading to significant advancements and successful commercialization in waterjet micromachining. Dr Liu's extensive experience uniquely prepared him to tackle waterjet challenges, fostering collaborations with universities and research institutes, resulting in his numerous publications. Despite retiring from OMAX/Hypertherm in March 2022, he continues his R&D endeavors, currently focusing on precision micromachining, and is working on a second book detailing the history of waterjets.