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Si Bui Quang Tran,Doyoung Byun 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The electrohydrodynamic (EHD) spraying technique has been utilized in applications such as inkjet printing and mass spectrometry technologies. In this paper, the role of electrical potential signals in jetting and on the oscillation of the meniscus is evaluated. The jetting and meniscus oscillation behavior are experimentally investigated under ac voltage, ac voltage superimposed on dc voltage, and pulsed dc voltage. Based on this in-depth study of the meniscus behavior under various signals, the optimal signal is implemented to an EHD inkjet head for drop-on-demand operation. For applied ac voltage and ac voltage superimposed on dc voltage, the jetting phenomenon is a dynamic process due to sequential opposite sign signals. Jetting occurs at the end of the oscillation cycle, where the meniscus oscillates upward and arrives at its highest position.
Si Bui Quang Tran,Doyoung Byun(변도영),Vu Dat Nguyen,Tae Sam Kang(강태삼) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The electrohydrodynamic (EHD) spraying technique has been utilized in applications such as inkjet printing and mass spectrometry technologies. In this paper, the role of electrical potential signals in jetting and on the oscillation of the meniscus is evaluated. The jetting and meniscus oscillation behavior are experimentally investigated under ac voltage, ac voltage superimposed on dc voltage, and pulsed dc voltage. Based on this in-depth study of the meniscus behavior under various signals. the optimal signal is implemented to an EHD inkjet head for drop-on-demand operation. For applied ac voltage and ac voltage superimposed on dc voltage, the jetting phenomenon is a dynamic process due to sequential opposite sign signals. Jetting occurs at the end of the oscillation cycle, where the meniscus oscillates upward and arrives at its highest position.
Tran, Si Bui Quang,Byun, Doyoung,Nguyen, Vu Dat,Kang, Tae Sam Published by the American Physical Society through 2009 Physical review. E, Statistical, nonlinear, and so Vol.80 No.2
<P>The electrohydrodynamic (EHD) spraying technique has been utilized in applications such as inkjet printing and mass spectrometry technologies. In this paper, the role of electrical potential signals in jetting and on the oscillation of the meniscus is evaluated. The jetting and the meniscus oscillation behavior are experimentally investigated under ac voltage, ac voltage superimposed on dc voltage, and pulsed dc voltage. Based on this in-depth study of the meniscus behavior under various signals, the optimal signal is implemented to an EHD inkjet head for drop-on-demand operation. For applied ac voltage and ac voltage superimposed on dc voltage, the jetting phenomenon is a dynamic process due to sequential opposite sign signals. The jetting occurs at the end of the oscillation cycle, where the meniscus oscillates upward and arrives at its highest position.</P>
Quang Tran Si, Bui,Byun, Doyoung,Lee, Sukhan Elsevier 2007 Journal of aerosol science Vol.38 No.9
<P><B>Abstract</B></P><P>The interference effect on an array of electrospray emitters is analytically and experimentally investigated. An analytical model is presented to predict the behavior of the operating voltage with respect to emitter spacing in an array of emitters. The basic idea of these models is to superimpose the electric potential of individual emitters together in an array of emitters. If only one of the emitters operates and no liquid is supplied through the neighboring emitters, the potential required to form a stable cone-jet generally increases as the emitters move closer to each other due to electrical shielding. However, at very close spacing the required potential decreases. If all the emitters operate simultaneously, the operating voltage required for cone-jet spraying increases as the emitter spacing decreases; furthermore, there is no decrease in potential when the spacing is very close. The results of the analytical electrostatic interference model agree well with the experimental data.</P>
Optimal Design of Grooves on Roller Surface Considering Air Entrainment and Web Deflection
Bui Quang Tran Si,Doyoung Byun,Jae Woo Lee,Gu Pil Jung,Hee Su Kang 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
Web traction over rollers is known to deteriorate due to air entrainment at high web speeds. Air entrainment can become a significant problem in a web handling process line and the development of an air film between a roller and web may cause a reduction in traction. Because the air film may bring a velocity difference between the web and roller and guiding problems, it should be appropriately removed using grooves, which are carved on the surface of the roller. Here a 2 dimensional fluid-web simulation model is presented to design optimal grooved roller, which can reduce the effects of the air entrainment and improve web traction. Traction simulations for spirally grooved as well as circumferentially grooved rollers have been conducted and compare the efficiencies. The simulation model is based on classical plate and shell theory, the Reynolds’ equation, and asperity contact theory. The governing equations are solved in an iterative scheme using a finite difference method.