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http://dx.doi.org/10.3795/KSME-B.2006.30.5.413

Experimental Analysis of Bubble Dynamics Induced by Pulsed-Laser Heating of Absorbing Liquid  

Jang Deok-Suk (포항공과대학교 대학원 기계공학과)
Hong Jong-Gan (포항공과대학교 대학원 기계공학과)
Choa Sung-Hoon (포항공과대학교 기계공학과)
Kim Dong-Sik (삼성 MEMS Lab.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.30, no.5, 2006 , pp. 413-421 More about this Journal
Abstract
The bubble dynamics induced by direct laser heating is experimentally analyzed as a first step to assess the technical feasibility of laser-based ink-jet technology. To understand the interaction between laser light and ink, the absorption spectrum is measured for various ink colors and concentrations. The hydrodynamics of laser-generated bubbles is examined by the laser-flash photography. When an Ar ion laser pulse (wavelength 488 nm) with an output power up to 600 mW is incident on the ink solution through a transparent window, a hemispherical bubble with a diameter up to ${\sim}100{\mu}m$ can be formed with a lifetime in a few tens of microsecond depending on the laser power and the focal-spot size. Parametric study has been performed to reveal the effect of laser pulse width, output power, ink concentration, and color on the bubble dynamics. The results show that the bubble generated by a laser pulse is largely similar to that produced by a thin-film heater. Consequently, the present work demonstrates the feasibility of developing a laser-actuated droplet generation mechanism for applications in ink-jet print heads. Furthermore, the results of this work indicate that the droplet generation frequency is likely to be further increased by optimizing the process parameters.
Keywords
Bubble Dynamics; Ink-jet Printer; Print Head; Pulsed-Laser Heating; Laser-Flash Photography;
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