Infrared absorption imaging of 2D supersonic jet expansions: Free expansion, cluster formation, and shock wave patterns

2013 ◽  
Vol 139 (2) ◽  
pp. 024201 ◽  
Author(s):  
Julia Zischang ◽  
Martin A. Suhm
Keyword(s):  
Shock Wave ◽  
Infrared Absorption ◽  
Cluster Formation ◽  
Supersonic Jet ◽  
Free Expansion ◽  
Absorption Imaging ◽  
Wave Patterns

Infrared Absorption Imaging of Water Ingress Into the Encapsulation of (Opto-)Electronic Devices

2019 ◽  
Vol 9 (1) ◽  
pp. 252-258 ◽  
Author(s):  
Johannes Hepp ◽  
Andreas Vetter ◽  
Stefan Langner ◽  
Michael Woiton ◽  
Gordana Jovicic ◽  
...  
Keyword(s):  
Infrared Absorption ◽  
Electronic Devices ◽  
Water Ingress ◽  
Absorption Imaging

scholarly journals Approximate Analytical Models of Shock-Wave Structure at Steady Mach Reflection

Fluids ◽  
2021 ◽  
Vol 6 (9) ◽  
pp. 305
Author(s):  
Mikhail V. Chernyshov ◽  
Karina E. Savelova ◽  
Anna S. Kapralova
Keyword(s):  
Experimental Data ◽  
Shock Wave ◽  
Comparative Analysis ◽  
Analytical Model ◽  
Mach Reflection ◽  
Supersonic Jet ◽  
Wave Structure ◽  
Analytical Models ◽  
Analytical Prediction ◽  
Shock Wave Structure

In this study, we obtain the comparative analysis of methods of quick approximate analytical prediction of Mach shock height in planar steady supersonic flows (for example, in supersonic jet flow and in narrowing channel between two wedges), that are developed since the 1980s and being actively modernized now. A new analytical model based on flow averaging downstream curved Mach shock is proposed, which seems more accurate than preceding models, comparing with numerical and experimental data.

A24 Effect of Pressure Ratio for Hysteresis Phenomenon of Shock Wave in Axisymmetric Supersonic Jet

2008 ◽  
Vol 2008.61 (0) ◽  
pp. 17-18
Author(s):  
Tsuyoshi Yasunobu ◽  
Yumiko Otobe ◽  
Hideo Kashimura ◽  
Toshiaki Setoguchi
Keyword(s):  
Shock Wave ◽  
Pressure Ratio ◽  
Supersonic Jet ◽  
Hysteresis Phenomenon ◽  
Effect Of Pressure

scholarly journals Nanoscale infrared absorption imaging permits non-destructive intracellular photosensitizer localization for subcellular uptake analysis

RSC Advances ◽  
2013 ◽  
Vol 3 (33) ◽  
pp. 13789 ◽  
Author(s):  
Eamonn Kennedy ◽  
Rasoul Al-Majmaie ◽  
Mohamed Al-Rubeai ◽  
Dominic Zerulla ◽  
James H. Rice
Keyword(s):  
Infrared Absorption ◽  
Absorption Imaging ◽  
Non Destructive

Shock wave propagation in non-uniform gas mixtures

2011 ◽  
Vol 226 (2) ◽  
pp. 123-130
Author(s):  
J Falcovitz ◽  
O Igra ◽  
D Igra
Keyword(s):  
Shock Wave ◽  
Wave Propagation ◽  
Shock Tube ◽  
Mass Fraction ◽  
Molar Fraction ◽  
Gaseous Mixture ◽  
Linear Distribution ◽  
Wave Patterns ◽  
Driver Section ◽  
Shock Tube Experiment

We consider a classical shock tube with Helium-filled driver section, and a driven section filled with a He– Ar gaseous mixture of continuously varying composition. We simulate a shock tube experiment, where the driven section composition starts out with pure Ar and ends with pure He (denoted ‘ − ’), or vice versa (denoted ‘+’). The initial pressures are 2 and 0.01 MPa. Two alternate initial species compositions are assumed: ‘Molar fraction’ – a linear distribution of the molar fraction; ‘Mass Fraction’ – a linear distribution of the mass fraction. Wave patterns arising in every case are presented and discussed.

Experimental and theoretical study of shock wave propagation through double-bend ducts

2001 ◽  
Vol 437 ◽  
pp. 255-282 ◽  
Author(s):  
O. IGRA ◽  
X. WU ◽  
J. FALCOVITZ ◽  
T. MEGURO ◽  
K. TAKAYAMA ◽  
...  
Keyword(s):  
Shock Wave ◽  
Wave Attenuation ◽  
Wave Pattern ◽  
Complex Flow ◽  
Shock Wave Attenuation ◽  
Planar Shock ◽  
Wave Patterns ◽  
Planar Shock Wave ◽  
Flow Evolution ◽  
Interferometric Study

The complex flow and wave pattern following an initially planar shock wave transmitted through a double-bend duct is studied experimentally and theoretically/numerically. Several different double-bend duct geometries are investigated in order to assess their effects on the accompanying flow and shock wave attenuation while passing through these ducts. The effect of the duct wall roughness on the shock wave attenuation is also studied. The main flow diagnostic used in the experimental part is either an interferometric study or alternating shadow–schlieren diagnostics. The photos obtained provide a detailed description of the flow evolution inside the ducts investigated. Pressure measurements were also taken in some of the experiments. In the theoretical/numerical part the conservation equations for an inviscid, perfect gas were solved numerically. It is shown that the proposed physical model (Euler equations), which is solved by using the second-order-accurate, high-resolution GRP (generalized Riemann problem) scheme, can simulate such a complex, time-dependent process very accurately. Specifically, all wave patterns are numerically simulated throughout the entire interaction process. Excellent agreement is found between the numerical simulation and the experimental results. The efficiency of a double-bend duct in providing a shock wave attenuation is clearly demonstrated.

Near-infrared absorption imaging of dense scattering media by steady-state diffusion tomography

1993 ◽  
Author(s):  
Harry L. Graber ◽  
Jeng-Hua Chang ◽  
Jack Lubowsky ◽  
Raphael Aronson ◽  
Randall L. Barbour
Keyword(s):  
Steady State ◽  
Infrared Absorption ◽  
Near Infrared ◽  
Scattering Media ◽  
Absorption Imaging ◽  
State Diffusion ◽  
Steady State Diffusion
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