Response of High-Pressure Micro Water Jets to Static and Dynamic Non-Uniform Electric Fields

[+] Author and Article Information
Yi Shi

Department of Mechanical Engineering, Northwestern University, Evanston, IL

Jian Cao

Department of Mechanical Engineering, Northwestern University, Evanston, IL

Kornel Ehmann

Department of Mechanical Engineering, Northwestern University, Evanston, IL

1Corresponding author.

ASME doi:10.1115/1.4039507 History: Received October 14, 2017; Revised February 26, 2018


The manipulation of the trajectory of high-pressure micro water jets has the potential to greatly improve the accuracy of water jet related manufacturing processes. An experimental study was conducted to understand the basic static and dynamic responses of high-pressure micro water jet systems in the presence of non-uniform electric fields. A single electrode was employed to create a non-uniform electric field to deflect a high-pressure micro water jet toward the electrode by the dielectrophoretic force generated. The water jet's motions were precisely recorded by a high-speed camera with a 20X magnification and the videos post-processed by a LabVIEW image processing program to acquire the deflections. The experiments revealed the fundamental relationships between three experimental parameters, i.e., voltage, pressure, and the distance between the water jet and the electrode and the deflection of the water jet in both non-uniform static and dynamic electric fields. In the latter case, electric signals at different frequencies were employed to experimentally investigate the jet's dynamic response, such as response time, frequency, and the stability of the water jet's motion. A first order system model was proposed to approximate the jet's response to dynamic input signals. The work can serve as the basis for the development of closed-loop control systems for manipulating the trajectory of high-pressure micro water jets.

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