Results 51 to 60 of about 109 (96)
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A Study of PZT Valveless Micropump With Asymmetric Obstacles
Microsystem Technologies, 2009The results of a study on a new type of PZT valveless micropump with asymmetric obstacles are presented in this paper. The valveless micropump was made through a MEMS fabrication process by using simply only one photo mask. Asymmetric obstacles are used for the flow directing device instead of the diffuser/nozzle elements used in previous studies.
Horn-Jiunn Sheen, U Lei, Ching-Jiun Lee
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Optimization of valveless micropump for drug delivery
The 9th IEEE International Conference on Nano/Micro Engineered and Molecular Systems (NEMS), 2014With controlled drug delivery system, appropriate and effective amount of drug can be precisely delivered at appropriate time by a micropump. This is achieved with the use of diffuser and nozzle elements that eliminate the need for valve mechanism simplifying the micropump design and fabrication.
Jiaqi Wang, Kean C. Aw, Rajnish Sharma
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Analytical Model of Valveless Micropumps
Journal of Microelectromechanical Systems, 2009The flow driven by a valveless micropump with a single cylindrical pump chamber and two diffuser/nozzle elements is studied theoretically using a 1-D model. The pump cavity is driven at an angular frequency omega so that its volume oscillates with an amplitude V m. The presence of diffuser/nozzle elements with pressure-drop coefficients zeta+, zeta- (>
I. Eames, A. Azarbadegan, M. Zangeneh
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SPIE Proceedings, 2009
A new valveless micropump for controlling micro-flow rate was designed and fabricated using simple fabrication technology. The working principle of valveless micropump was analyzed based on Computational Fluid Dynamics (CFD) program ANSYS/Flotran.
S. M. Yuan, L. T. Yan, Q. Liu
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A new valveless micropump for controlling micro-flow rate was designed and fabricated using simple fabrication technology. The working principle of valveless micropump was analyzed based on Computational Fluid Dynamics (CFD) program ANSYS/Flotran.
S. M. Yuan, L. T. Yan, Q. Liu
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Study on geometry of valveless-micropump
2009 IEEE/ASME International Conference on Advanced Intelligent Mechatronics, 2009A gas-jet micro pump with novel cross-junction channel has been designed and fabricated using a Si micromachining process. The valveless micro pump is composed of a piezoelectric lead zirconate titanate (PZT) diaphragm actuator and fluidic network. The design of the valveless pump focuses on a cross-junction formed by the neck of the pump chamber and ...
V. T. Dau +3 more
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The development of a valveless piezoelectric micropump
2010 26th Annual IEEE Semiconductor Thermal Measurement and Management Symposium (SEMI-THERM), 2010Previous studies have indicated that the performance of the micropump is influenced by the driving voltage, frequency, valves, and pump chambers. In this study, an innovative one-side actuating valveless micropump is proposed and developed to actuate liquid in one direction with high flow rates and pump heads.
H. K. Ma, B. R. Chen
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Valveless impedance micropump with integrated magnetic diaphragm
Biomedical Microdevices, 2009This study presents a planar valveless impedance-based micropump for biomedical applications comprising a lower glass substrate patterned with a copper micro-coil, a microchannel, an upper glass cover plate, and a PDMS diaphragm with an electroplated magnet on its upper surface.
Chia-Yen, Lee, Zgen-Hui, Chen
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Numerical Study on the Performance of a Valveless Micropump
Volume 13: Nano-Manufacturing Technology; and Micro and Nano Systems, Parts A and B, 2008A valveless micropump based on electromagnetic actuation is numerically described. The pump is formed on one planar layer consisting of two inlet channels, a pump chamber, and an outlet channel whose depths are 0.3mm. The PDMS membrane enclosed on the top of the pump chamber can be periodically actuated by an electromagnetic actuator.
Thien X. Dinh, Yoshifumi Ogami
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Combination Rules for Multichamber Valveless Micropumps
Journal of Microelectromechanical Systems, 2013The general design rules indicate that when identical macroscale pumps (each with a maximum flowrate Qm, and maximum pressure drop ΔPmax) are combined in series, the maximum flowrate is Qm, but the maximum pressure drop becomes 2ΔPmax, while combined in parallel the maximum flowrate becomes 2Qm, and the maximum pressure is ΔPmax. In this paper, we test
Alireza Azarbadegan +4 more
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Valveless Micropumps with Dual Polyimide Diaphragms
Applied Mechanics and Materials, 2013Air-actuated valveless micropumps with dual polyimide (PI) diaphragms have been fabricated and characterized. A 5-μm-thick PI membrane was spin-coated on Si wafer, and released by Si ICP etching. The membrane was actuated by alternating air pressure of 10 kPa. The water flow-rate achieved 80 μl/min at the frequency of 1 Hz and 126 μl/min at 3Hz. Due to
Ryuta Ikoma +5 more
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