Theoretical and Experimental Performance of a High Frequency Micropump

2005 ◽  
Author(s):  
Aaron Astle ◽  
Luis P. Bernal ◽  
Hanseup Kim ◽  
Khalil Najafi ◽  
Peter D. Washabaugh
Keyword(s):  
High Frequency ◽  
Maximum Flow ◽  
Maximum Pressure ◽  
Experimental Characterization ◽  
Chemical Monitoring ◽  
Multi Stage ◽  
Micro Systems ◽  
The University ◽  
Theoretical Analyses

This paper details theoretical analyses and experimental characterization of high-frequency multi-stage micro pumps. The MEMS-fabricated micro pumps have been developed for use in a highly-integrated chemical monitoring system under development at the University of Michigan’s Wireless Integrated Micro-Systems center. Tests are reported on a 20x meso-scale 2-stage pump developed to validate the theoretical analyses. Detailed comparisons of the pump performance and unsteady pressure traces show that the theoretical analyses capture the main features of the flow in the pump. A MEMS-fabricated device has been developed and tested. The use of theoretical analyses for the design of the pump is described. This device produces A maximum flow of 1.1 ccm and a maximum pressure of 879 Pa.

Directional Pumping Performance of an Electrostatic Checkerboard Microvalve

2006 ◽  
Author(s):  
Hanseup Kim ◽  
Aaron A. Astle ◽  
Luis P. Bernal ◽  
Khalil Najafi ◽  
Peter D. Washabaugh
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Maximum Flow ◽  
Pressure Differential ◽  
Oscillatory Motion ◽  
Sinusoidal Signal ◽  
Maximum Pressure ◽  
Experimental Characterization ◽  
Gas Pumping

This paper reports experimental characterization of directional gas pumping generated by MEMS-fabricated checkerboard-type electrostatic microvalves. It is found that the oscillatory motion of the checkerboard microvalve membrane provides both the pumping and valve functions of a pump, namely: 1) to cause the volume displacement and, thus, compression and transfer of gas, and 2) to direct gas flow in one direction by closing and opening air paths in the proper sequence. Here, we describe the microvalve-only design, and report the pumping performance producing a maximum flow rate of 1.8 sccm and a maximum pressure differential of 3.0 kPa for five microvalves driven simultaneously with a sinusoidal signal of ± 100V amplitude at 5.5 kHz.

Characterization of a Radiantly Driven Multistage Knudsen Compressor

2003 ◽  
Author(s):  
M. Young ◽  
Y. L. Han ◽  
E. P. Muntz ◽  
G. Shiflett
Keyword(s):  
Steady State ◽  
Atmospheric Pressure ◽  
Maximum Flow ◽  
Performance Model ◽  
Experimental Results ◽  
Maximum Pressure ◽  
Flow Rates ◽  
Micro Scale ◽  
Knudsen Compressors

Knudsen Compressors are meso/micro scale gas compressors/pumps based on thermal transpiration or thermal creep. The design of radiantly driven Knudsen Compressors is discussed, along with a model that was developed to understand their performance. Experimental pumping performances for Knudsen Compressors with one, two, five, and fifteen stage, radiantly driven cascades are also discussed. Temperature measurements across the transpiration membranes, for various pressures of Nitrogen, were obtained and compared to those predicted by the performance model. The results agree with the model to within 15% consistently under predicting the measured hot side temperature of the transpiration membrane. The pump-down curves, steady-state maximum pressure differences, and maximum flow rates produced by a single stage Knudsen Compressor were obtained. A variety of configurations were studied at pressures from 500 mTorr to atmospheric pressure. The experimental results agreed with the performance model’s predictions to within 20%.

Numerical and experimental characterization of multi-stage Savonius rotors

Energy ◽  
2016 ◽  
Vol 114 ◽  
pp. 382-404 ◽  
Author(s):  
Sobhi Frikha ◽  
Zied Driss ◽  
Emna Ayadi ◽  
Zied Masmoudi ◽  
Mohamed Salah Abid
Keyword(s):  
Experimental Characterization ◽  
Multi Stage

Experimental characterization of fundamental and second harmonic beams for a high-frequency ultrasound transducer

2002 ◽  
Vol 28 (5) ◽  
pp. 635-646 ◽  
Author(s):  
Emmanuel W Cherin ◽  
Jens Kristian Poulsen ◽  
A.F.W van der Steen ◽  
Paul Lum ◽  
F.Stuart Foster
Keyword(s):  
High Frequency ◽  
Second Harmonic ◽  
Ultrasound Transducer ◽  
Experimental Characterization ◽  
High Frequency Ultrasound ◽  
Frequency Ultrasound

scholarly journals Experimental Characterization of the Coupling Stage of a Two-Stage Planetary Gearbox in Variable Operational Conditions

Machines ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 45 ◽  
Author(s):  
Claudia Aide González-Cruz ◽  
Marco Ceccarelli
Keyword(s):  
Internal Friction ◽  
Experimental Characterization ◽  
Two Stage ◽  
Friction Forces ◽  
Operational Conditions ◽  
Planetary Gearbox ◽  
Input Shaft ◽  
University Of Rome ◽  
The University

This paper presents an experimental characterization of a two-stage planetary gearbox (TSPG) designed at the Laboratory of Robot Mechatronics (LARM2) in the University of Rome Tor Vergata. The TSPG operates differentially as function of the attached load and the internal friction forces caused for the contact between gears. Experiments under varying load conditions are developed in order to analyze the usefulness of the gearbox to avoid excessive torques on its internal elements. The analysis of the dynamic torques is presented as an indicator of stability in the gearbox operation. The results show that the actuation of the second operation stage reduces the torques 57% in the output shaft and 65% in the input shaft. The efficiency of the gearbox is estimated as 40% in presence of high internal friction forces.

High-frequency experimental characterization of impedance bonds used in railway systems

2008 ◽  
Author(s):  
Eugenio Fedeli ◽  
Sergio A. Pignari ◽  
Giordano Spadacini
Keyword(s):  
High Frequency ◽  
Experimental Characterization ◽  
Railway Systems

Experimental Characterization of an EHD Ion-Drag Micropump for Cryogenic Micro-Pumping Applications

2007 ◽  
Author(s):  
P. Foroughi ◽  
S. Dessiatoun ◽  
A. Shooshtari ◽  
M. M. Ohadi
Keyword(s):  
Liquid Nitrogen ◽  
Pressure Head ◽  
Vital Role ◽  
Electrode Spacing ◽  
Electrode Pair ◽  
Generation Process ◽  
Experimental Characterization ◽  
Multi Stage ◽  
Probabilistic Nature

This paper presents a study on the characterization of a planar multi-stage electrohydrodynamic (EHD) ion-drag micropump for pumping of liquid nitrogen. Four designs of the pump — consisting of different emitter configurations (planar and saw-tooth), emitter-collector spacings (20 and 50 microns), and gaps between successive electrode pairs (80, 100 and 200 microns) — were tested at DC voltages ranging from 0 to 2.5 kV. The generated electric currents and static pressure heads were measured to characterize the pumping performance. After collecting and processing the data for the various designs, it was evident that the purity of the liquid plays a vital role in the repeatability of the pumping results. In all cases high-purity liquid nitrogen was used. The complex interaction between the liquid and the electrodes along with the probabilistic nature of the ion-generation process sometimes prohibited achieving the same pumping performance under identical voltage levels, thus purity of the nitrogen used was very important. The highest pressure head (30 Pa at 1700 V) was generated with a (50,100,s) design. The (50,100,s) stands for saw-tooth emitters and planar collectors, 50 μm inter-electrode spacing, and 100 μm electrode-pair spacing.

scholarly journals Simple, Compact, and Multiband Frequency Selective Surfaces Using Dissimilar Sierpinski Fractal Elements

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Clarissa de Lucena Nóbrega ◽  
Marcelo Ribeiro da Silva ◽  
Paulo Henrique da Fonseca Silva ◽  
Adaildo Gomes D’Assunção ◽  
Gláucio Lima Siqueira
Keyword(s):  
High Frequency ◽  
Design Methodology ◽  
Frequency Tuning ◽  
Microstrip Antennas ◽  
Frequency Selective Surfaces ◽  
Experimental Characterization ◽  
Spatial Filters ◽  
Frequency Responses ◽  
Frequency Selective

This paper presents a design methodology for frequency selective surfaces (FSSs) using metallic patches with dissimilar Sierpinski fractal elements. The transmission properties of the spatial filters are investigated for FSS structures composed of two alternately integrated dissimilar Sierpinski fractal elements, corresponding to fractal levelsk=1, 2, and 3. Two FSS prototypes are fabricated and measured in the range from 2 to 12 GHz to validate the proposed fractal designs. The FSSs with dissimilar Sierpinski fractal patch elements are printed on RT/Duroid 6202 high frequency laminate. The experimental characterization of the FSS prototypes is accomplished through two different measurement setups composed of commercial horns and elliptical monopole microstrip antennas. The obtained results confirm the compactness and multiband performance of the proposed FSS geometries, caused by the integration of dissimilar fractal element. In addition, the proposed FSSs exhibited frequency tuning ability on the multiband frequency responses. Agreement between simulated and measured results is reported.

scholarly journals Design and experimental characterization of a NiTi-based, high-frequency, centripetal peristaltic actuator

2015 ◽  
Vol 24 (3) ◽  
pp. 035008 ◽  
Author(s):  
E Borlandelli ◽  
D Scarselli ◽  
A Nespoli ◽  
D Rigamonti ◽  
P Bettini ◽  
...  
Keyword(s):  
High Frequency ◽  
Experimental Characterization
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