scholarly journals Performance Evaluation of a Resonant-integrated Pumping System

2018 ◽  
Vol 202 ◽  
pp. 02009
Author(s):  
Vincent Chieng-Chen Lee
Keyword(s):  
Performance Evaluation ◽  
Excitation Frequency ◽  
Pressure Head ◽  
Low Noise ◽  
Integrated System ◽  
Positive Outcomes ◽  
Pumping System ◽  
At Resonance ◽  
Impedance Pump ◽  
Maximum Amplification

Impedance pump is a simple valve-less pumping mechanism; it offers a low energy, low noise alternative at both macro- and micro-scale devices. It is also demonstrated to be a promising new technique for producing and amplifying net flow. There have been research studying the effects of series-connected impedance pump, where an increase in net flow is exhibited. In this study, an integrated system of conventional pump and impedance pump is introduced. This paper describes the performance evaluation of this integrated pumping system, with emphasis on the amount of amplification induced as a function of Womersley number (normalized excitation frequency) and normalized pressure head. Due to the nature of the resonant valve-less impedance pump, the integrated pumping system exhibits similar behaviour and characteristics as an impedance pump, such as the pulsatile nature of net flow. Results show positive outcomes where maximum amplification of 91.7% is demonstrated at resonance.

A new method of fluxgate signal extraction

2017 ◽  
Vol 2017 (45) ◽  
pp. 83-89
Author(s):  
A.A. Marusenkov ◽  
Keyword(s):  
High Frequency ◽  
Second Harmonic ◽  
Excitation Frequency ◽  
Low Noise ◽  
Measuring System ◽  
Signal Extraction ◽  
Fluxgate Magnetometer ◽  
New Approach ◽  
Average Value ◽  
The Time Domain

Using dedicated high-frequency measuring system the distribution of the Barkhausen jumps intensity along a reversal magnetization cycle was investigated for low noise fluxgate sensors of various core shapes. It is shown that Barkhausen (reversal magnetization) noise intensity is strongly inhomogeneous during an excitation cycle. In the traditional second harmonic fluxgate magnetometers the signals are extracted in the frequency domain, as a result, some average value of reversal magnetization noises is contributed to the output signals. In order to fit better the noise shape and minimize its transfer to the magnetometer output the new approach for demodulating signals of these sensors is proposed. The new demodulating method is based on information extraction in the time domain taking into account the statistical properties of cyclic reversal magnetization noises. This approach yields considerable reduction of the fluxgate magnetometer noise in comparison with demodulation of the signal filtered at the second harmonic of the excitation frequency.

Development of an Electrohydrodynamic Injection Micropump for Cryogenic Cooling

2003 ◽  
Author(s):  
J. Darabi ◽  
H. Wang
Keyword(s):  
Experimental Investigation ◽  
Liquid Nitrogen ◽  
Pressure Head ◽  
Cryogenic Cooling ◽  
Maximum Pressure ◽  
Base Length ◽  
Inhomogeneous Electric Field ◽  
Cooling Systems ◽  
Pumping System ◽  
Cryogenic Liquids

Cryogenic cooling has become a widely adopted technique to improve the performance of electronics and sensors. A potential application of an electrohydrodynamic (EHD) pumping system is its use in pumping fluids in cryogenic cooling systems. In this paper we present the results of a theoretical/experimental investigation to study the feasibility of using an EHD injection micropump for pumping liquid nitrogen. First, the mechanisms of charge transport and ionization phenomenon in cryogenic liquids are discussed. Next, the design and fabrication of an EHD injection micropump that employs an array of interdigitated saw-tooth/plane electrodes are described. Finally, experimental results and observations are presented. An asymmetric saw-tooth/plane geometry was designed to achieve strong inhomogeneous electric field. Each saw-tooth had a base length of 10 μm with a tip angle of 60°. The gap between emitter and collector electrodes was 20 μm and the distance between each stage (a pair of emitter and collector electrodes) from neighboring stage was 40 μm. The dimensions of the patterned area were 10 mm by 20 mm allowing approximately 300 stages to be fabricated along the length of the micropump. The maximum pressure head achieved by this micropump was 550 Pa and 205 Pa for HFE-7100 and liquid nitrogen, respectively.

HEMT for low-noise microwaves: CAD-oriented performance evaluation

1995 ◽  
Vol 43 (6) ◽  
pp. 1226-1229 ◽  
Author(s):  
G. Capponi ◽  
B. Di Maio ◽  
P. Livreri
Keyword(s):  
Performance Evaluation ◽  
Low Noise

Experimental Analysis of Impedance-Driven Reverse Flow Dynamics

2016 ◽  
Vol 819 ◽  
pp. 305-308
Author(s):  
V.C.C. Lee ◽  
Chang Hong Chai ◽  
Ming Chiat Law ◽  
S.K. Wee
Keyword(s):  
Experimental Analysis ◽  
Peak Flow ◽  
Reverse Flow ◽  
Excitation Frequency ◽  
Open Loop ◽  
Flow Dynamics ◽  
Driving Mechanism ◽  
Forward Peak ◽  
Dynamical Study ◽  
Impedance Pump

Impedance pump is a type of valveless pumping device, in which it utilizes a bio-inspired mechanism for pumping of fluid based on resonant wave interactions along a flexible media. By inducing a periodic asymmetrical compression on the flexible media will produce a unidirectional flow within the system. The impedance pump has many beneficial characteristics which make it an effective driving mechanism, especially for micro-fluidic systems. In addition, the wave-based mechanism through which pumping occurs infers many benefits in terms of simplicity of design and manufacturing. Adjustment of simple parameters such as the excitation frequency or compression location will reverse the direction of flow, providing a very versatile range of flow outputs. This paper describes the experimental analysis of such impedance-driven flow with emphasis on dynamical study of the reverse flow in open-loop environment. In this study, tapered section with converging steps is introduced at both ends of the flexible media to amplify the reverse flow. Study conducted shows that the reverse peak flow is rather significant with estimate of 23% lower than the forward peak flow. The flow dynamics on the other hand has shown to exhibit different characteristics as per the forward peak flow.

Microfluidic Pumping With Optically Induced Actuation of a Carbon Nanotube Membrane

2010 ◽  
Author(s):  
Joseph D. Duff ◽  
Stuart J. Williams ◽  
Balaji Panchapakesan
Keyword(s):  
Carbon Nanotubes ◽  
Low Cost ◽  
Fluid Motion ◽  
Pressure Head ◽  
Low Noise ◽  
Device Fabrication ◽  
Alternative Methods ◽  
Micro Pump ◽  
Photomechanical Actuation ◽  
Optically Induced

We present the design; fabrication and testing of a Polydimethylsiloxane (PDMS)-based microfluidic pump with optically induced membrane actuation. The thin membrane consists of a layer of PDMS (100 μm) and a layer of carbon nanotubes (190 nm). An applied infrared laser opto-mechanically activates the film of carbon nanotubes (CNT), leading to membrane deformation and subsequent fluid motion. Photomechanical actuation offers an alternative way to drive microfluidic devices and provides distinct advantages over alternative methods. The advantages include simplistic, low-cost device fabrication, Wireless actuation, remote controllability electrical–mechanical decoupling, low noise and the elimination of electrical circuits. The performance of this pump in terms of pressure head and flow rate is substantially high. In addition, the micro pump is self-priming and insensitive to particles and bubbles in the pumped media.

scholarly journals Evaluasi Kinerja Billingsystem Rawat Inap Menggunakan Kerangka Pieces

2016 ◽  
Vol 4 (1) ◽  
pp. 18
Author(s):  
Jihan Anfa ◽  
Djazuly Chalidyanto
Keyword(s):  
Performance Evaluation ◽  
Skills Training ◽  
Integrated System ◽  
Cross Sectional ◽  
Patient Dissatisfaction ◽  
Billing System ◽  
Standard Operating ◽  
Cross Sectional Design ◽  
It Training

The occurrence of patient dissatisfaction in Wiyung Sejahtera Hospital associated with the duration in providing the hospitalization bills information shows 90.26% in January to November 2014. This research aimed to analyze the knowledge, necessity of skills training and human resource needed related to billingsysteminevaluating the performance of billing system through user’s perspective by using PIECES Framework. This isdescriptive analytic studywith cross-sectional design. Information obtained from 57 respondents, which inputand verifies bills on the application billingsystem hospitalization. The result showed that the knowledge of billingsystemusers is good, the necessity of IT training is not fulfilled and user’s skills is not good. Billingsystemhospitalization performance evaluation using PIECES Framework results for all indicators are constraints; Performancemean 2,6667; Informationmean 2,8319; Economymean 2,6901; Controlmean 2,7544; Efficiency mean 2,7661 and Servicemean 2,8596. There is a strong correlation between training toward users knowledge about billingsystem. In order to improve the quality of service, it is urgently required to hospital itself providing training to users, developing into a fully package integrated system and arranging standard operating procedures.Keywords: billingsystemperformance, evaluation,PIECES framework

scholarly journals Performance Evaluation of Solar Photovoltaic Water Pumping System

2018 ◽  
Vol 7 (12) ◽  
pp. 2627-2632
Author(s):  
L. Aiswarya ◽  
K. Arunadevi ◽  
R. Lalitha ◽  
S. Vallalkannan
Keyword(s):  
Performance Evaluation ◽  
Solar Photovoltaic ◽  
Pumping System ◽  
Water Pumping
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