scholarly journals Characterization of Plasma Flow Through Magnetic Nozzles

1990 ◽  
Author(s):  
R.A. Gerwin ◽  
G.J. Marklin ◽  
A.G. Sgro ◽  
A.H. Glasser
Keyword(s):  
Plasma Flow ◽  
Flow Through ◽  
Magnetic Nozzles

scholarly journals Spectral Decomposition of the Flow and Characterization of the Sound Signals through Stenoses with Different Levels of Severity

2021 ◽  
Vol 8 (3) ◽  
pp. 41
Author(s):  
Fardin Khalili ◽  
Peshala T. Gamage ◽  
Amirtahà Taebi ◽  
Mark E. Johnson ◽  
Randal B. Roberts ◽  
...  
Keyword(s):  
Pressure Fluctuations ◽  
High Energy ◽  
Sound Sources ◽  
Severity Level ◽  
Non Invasive ◽  
Flow Through ◽  
Severity Of The Disease ◽  
Proper Orthogonal ◽  
Different Levels

Treatments of atherosclerosis depend on the severity of the disease at the diagnosis time. Non-invasive diagnosis techniques, capable of detecting stenosis at early stages, are essential to reduce associated costs and mortality rates. We used computational fluid dynamics and acoustics analysis to extensively investigate the sound sources arising from high-turbulent fluctuating flow through stenosis. The frequency spectral analysis and proper orthogonal decomposition unveiled the frequency contents of the fluctuations for different severities and decomposed the flow into several frequency bandwidths. Results showed that high-intensity turbulent pressure fluctuations appeared inside the stenosis for severities above 70%, concentrated at plaque surface, and immediately in the post-stenotic region. Analysis of these fluctuations with the progression of the stenosis indicated that (a) there was a distinct break frequency for each severity level, ranging from 40 to 230 Hz, (b) acoustic spatial-frequency maps demonstrated the variation of the frequency content with respect to the distance from the stenosis, and (c) high-energy, high-frequency fluctuations existed inside the stenosis only for severe cases. This information can be essential for predicting the severity level of progressive stenosis, comprehending the nature of the sound sources, and determining the location of the stenosis with respect to the point of measurements.

Characterization of the water flow through concrete based on parameter estimation from infiltration tests

2006 ◽  
Vol 36 (9) ◽  
pp. 1575-1582 ◽  
Author(s):  
Vicente Navarro ◽  
Ángel Yustres ◽  
Luís Cea ◽  
Miguel Candel ◽  
Ricardo Juncosa ◽  
...  
Keyword(s):  
Parameter Estimation ◽  
Water Flow ◽  
Flow Through ◽  
Infiltration Tests

Experimental characterization of single and two-phase flow through nickel foams

2009 ◽  
Vol 64 (19) ◽  
pp. 4186-4195 ◽  
Author(s):  
Odile Gerbaux ◽  
Thibaut Vercueil ◽  
Alain Memponteil ◽  
Bruno Bador
Keyword(s):  
Two Phase Flow ◽  
Phase Flow ◽  
Experimental Characterization ◽  
Two Phase ◽  
Nickel Foams ◽  
Flow Through

Plasma flow through a localized heat release region

1999 ◽  
Author(s):  
Sergey Surzhikov ◽  
Nikos Gatsonis
Keyword(s):  
Heat Release ◽  
Plasma Flow ◽  
Flow Through

In-vitro characterization of flow through mechanical heart valves

2006 ◽  
Vol 39 ◽  
pp. S306 ◽  
Author(s):  
L.P. Dasi ◽  
H. Simon ◽  
L. Ge ◽  
F. Sotiropoulos ◽  
A. Yoganathan
Keyword(s):  
Heart Valves ◽  
Mechanical Heart Valves ◽  
In Vitro Characterization ◽  
Flow Through

Characterization of cavitation in a flow-through exposure chamber by means of a resonant bubble detector

Ultrasonics ◽  
1984 ◽  
Vol 22 (5) ◽  
pp. 224-230 ◽  
Author(s):  
D.L. Miller ◽  
A.R. Williams ◽  
D.R. Gross
Keyword(s):  
Exposure Chamber ◽  
Flow Through

The Effect of Injection and Suction on the Interfacial Mass Transport Resistance in a Proton Exchange Membrane Fuel Cell Air Channel

2014 ◽  
Author(s):  
Mustafa Koz ◽  
Satish G. Kandlikar
Keyword(s):  
Proton Exchange Membrane ◽  
Numerical Study ◽  
Gas Diffusion ◽  
Proton Exchange ◽  
Channel Cross Section ◽  
Flow Through ◽  
Air Channel ◽  
Air Channels ◽  
Exchange Membrane

Proton exchange membrane fuel cells are efficient and environmentally friendly electrochemical engines. The present work focuses on air channels that bring the oxidant air into the cell. Characterization of the oxygen concentration drop from the channel to the gas diffusion layer (GDL)-channel interface is a need in the modeling community. This concentration drop is expressed with the non-dimensional Sherwood number (Sh). At the aforementioned interface, the air can have a non-zero velocity normal to the interface: injection of air to the channel and suction of air from the channel. A water droplet in the channel can constrict the channel cross section and lead to a flow through the GDL. In this numerical study, a rectangular air channel, GDL, and a stationary droplet on the GDL-channel interface are simulated to investigate the Sh under droplet induced injection/suction conditions. The simulations are conducted with a commercially available software package, COMSOL Multiphysics.

scholarly journals Preparation and Characterization of Perforated SERS Active Array for Particle Trapping and Sensitive Molecular Analysis

Biosensors ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 93 ◽  
Author(s):  
István Rigó ◽  
Miklós Veres ◽  
Tamás Váczi ◽  
Eszter Holczer ◽  
Orsolya Hakkel ◽  
...  
Keyword(s):  
Molecular Analysis ◽  
Silicon Surface ◽  
3D Structure ◽  
Raman Spectroscopic ◽  
Cell Trapping ◽  
Highly Sensitive ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Flow Through

A gold-coated array of flow-through inverse pyramids applicable as substrate for entrapment and immobilization of micro-objects and for surface enhanced Raman spectroscopic measurements was fabricated using bulk micromachining techniques from silicon. Surface morphology, optical reflectance, immobilization properties, and surface enhanced Raman amplification of the array were modelled and characterized. It was found that the special perforated periodic 3D structure can be used for parallel particle and cell trapping and highly sensitive molecular analysis of the immobilized objects.

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