Hydrodynamic Fluctuation Due to the Discontinuity of Flow Impedance

1983 ◽  
Vol 52 (2) ◽  
pp. 355-356 ◽  
Author(s):  
Tatsuyuki Kawakubo ◽  
Tsuneo Murata ◽  
Yoshimi Tsuchiya
Keyword(s):  
Flow Impedance ◽  
Hydrodynamic Fluctuation

Impedance eduction for uniform and multizone acoustic liners

2021 ◽  
pp. 1475472X2110238
Author(s):  
Michael G Jones ◽  
Douglas M Nark ◽  
Brian M Howerton
Keyword(s):  
Impedance Spectra ◽  
International Forum ◽  
Acoustic Liners ◽  
Prony Method ◽  
Research Challenges ◽  
Test Conditions ◽  
Acoustic Liner ◽  
Flow Impedance ◽  
Grazing Flow ◽  
Computationally Expensive

This paper presents results for five uniform and two multizone liners based on data acquired in the NASA Langley Grazing Flow Impedance Tube. Two methods, Prony and CHE, are used to educe the impedance spectra for each of these liners for many test conditions. The Prony method is efficient and generally provides accurate results for uniform liners, but is not well suited for multizone liners. The CHE method supports assessment of both uniform and multizone liners, but is much more computationally expensive. The results from these liners demonstrate the efficacy of both eduction methods, but also clearly demonstrate that sufficient attenuation is required to support accurate impedance eduction. For the liners considered in this study, the data indicate approximately 3 dB attenuation is needed for each zone of a multizone liner in order to ensure quality impedance eduction results. This study was conducted in response to two acoustic liner research challenges in support of a collaboration of multiple national laboratories under the International Forum for Aviation Research.

Viscosity of normal human blood under normothermic and hypothermic conditions

1964 ◽  
Vol 19 (1) ◽  
pp. 117-122 ◽  
Author(s):  
Peter W. Rand ◽  
Eleanor Lacombe ◽  
Hamilton E. Hunt ◽  
William H. Austin
Keyword(s):  
Blood Flow ◽  
Shear Rate ◽  
Heart Surgery ◽  
Blood Rheology ◽  
Normal Subjects ◽  
Future Studies ◽  
Flow Impedance ◽  
Normal Human ◽  
Technical Details ◽  
Normal Human Blood

Although blood viscosity varies in relation to shear rate, hematocrit, and temperature, equipment is now available with which it may be measured in respect to each of these variables. A simple, clinically practical technique for such measurement is presented. Blood from 60 normal subjects was adjusted to hematocrits 0, 20, 40, 60, and 80, and the viscosity-shear rate relationships measured at 37.0, 32.0, 27.0, and 22.0 C. The data obtained are presented as a reference for future studies using this method. Technical details are discussed and some deserving areas of application are considered. shear rate; cone-plate viscometer; hematocrit-viscosity relationships; blood, plasma; hematocrit; temperature; blood flow impedance; perfusion; shock; oliguria; dyspnea; coma; heart surgery; blood rheology; metabolism Submitted on May 31, 1963

scholarly journals Resistance Index of Cerebral Artery Blood Flow Impedance in Preterm Neonates.† 939

1998 ◽  
Vol 43 ◽  
pp. 162-162
Author(s):  
S Abbasi ◽  
J Anderson ◽  
G Agrons ◽  
R Dworanczyk ◽  
J Gerdes
Keyword(s):  
Blood Flow ◽  
Cerebral Artery ◽  
Resistance Index ◽  
Preterm Neonates ◽  
Artery Blood Flow ◽  
Flow Impedance

scholarly journals The effect of flow impedance on deposition of Cryptosporidium parvum oocysts with or without a vetiver buffer strip

2008 ◽  
Vol 40 (10) ◽  
pp. 2696-2698 ◽  
Author(s):  
Janet Hussein ◽  
Hossein Ghadiri ◽  
Mavourneen Lutton ◽  
Andrew Smolders ◽  
Peter Schneider
Keyword(s):  
Cryptosporidium Parvum ◽  
Buffer Strip ◽  
Flow Impedance ◽  
Cryptosporidium Parvum Oocysts

Real-time flow impedance evaluation method for ultra-fast early detection of aneurysmal diseases

2021 ◽  
Vol 64 ◽  
pp. 102256
Author(s):  
Yoke Rung Wong ◽  
Chi Wei Ong ◽  
Alyssa LiYu Toh ◽  
Einly Lim ◽  
Pei Ho ◽  
...  
Keyword(s):  
Early Detection ◽  
Real Time ◽  
Evaluation Method ◽  
Time Flow ◽  
Flow Impedance

Hydrodynamic fluctuation theories

1978 ◽  
Vol 19 (9) ◽  
pp. 1993-1999 ◽  
Author(s):  
Ronald Forrest Fox
Keyword(s):  
Hydrodynamic Fluctuation

scholarly journals Flow impedance in a uniform magnetically insulated transmission line

1999 ◽  
Vol 6 (12) ◽  
pp. 4791-4793 ◽  
Author(s):  
C. W. Mendel ◽  
D. B. Seidel
Keyword(s):  
Transmission Line ◽  
Flow Impedance
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