Characterization of the Near-Field Spray and Internal Flow of Single-Hole and Multi-Hole Sac Nozzles using Phase Contrast X-Ray Imaging and CFD

2011 ◽  
Vol 4 (1) ◽  
pp. 703-719 ◽  
Author(s):  
Ming-Chia Lai ◽  
Yi Zheng ◽  
Xing-Bin Xie ◽  
Seoksu Moon ◽  
Zunping Liu ◽  
...  
Keyword(s):  
Phase Contrast ◽  
Near Field ◽  
Internal Flow ◽  
X Ray ◽  
Single Hole ◽  
X Ray Imaging

Characterization of Internal flow and Spray of Multihole DI Gasoline Spray using X-ray Imaging and CFD

2011 ◽  
Author(s):  
Ming-Chia Lai ◽  
Yi Zheng ◽  
Mark Shost ◽  
Xingbin Xie ◽  
Atsushi Matsumoto ◽  
...  
Keyword(s):  
Internal Flow ◽  
X Ray ◽  
X Ray Imaging

The effect of transient needle lift on the internal flow and near-nozzle spray characteristics for modern GDI systems investigated by high-speed X-ray imaging

2021 ◽  
pp. 146808742098675 ◽  
Author(s):  
Dmitrii Mamaikin ◽  
Tobias Knorsch ◽  
Philipp Rogler ◽  
Jin Wang ◽  
Michael Wensing
Keyword(s):  
High Speed ◽  
Near Field ◽  
Internal Flow ◽  
Transient Behavior ◽  
Liquid Jet ◽  
Nozzle Flow ◽  
Spray Characteristics ◽  
X Ray ◽  
X Ray Imaging ◽  
Primary Breakup

The development of the injector nozzle is a dynamic area in regard of several technical aspects. At first, the internal flow influences the near-field spray characteristics via various phenomena such as cavitation and turbulence. However, these phenomena are not fully understood due to their extremely fast, complex and multiscale nature. Furthermore, it governs the spray targeting inside the combustion chamber. High-speed X-ray imaging of GDI injector nozzles is performed in this study. The experimental results presented are related to the internal flow and primary breakup of discharged liquid jets. The injectors used are equipped with nozzles made of aluminum which have been specially developed for these investigations to enhance optical accessibility. The visualization of the needle motion, in-nozzle flow and the primary breakup region provides several exciting observations. First, the needle lift tracking exhibits short overshooting right before the steady-state of the injection phase. This event leads to a short-term, however, significant change in the associated performance of the breakup. This phenomenon is found to be a consequence of the transient behavior of the in-nozzle flow. It is shown that under some circumstances hydraulic flip may occur during this overshooting period. The primary jet breakup region is visualized and evaluated by means of image processing. Thus, the transient behavior of liquid jet expansion is quantified in the vicinity of the nozzle. It is observed that the liquid jet direction deviates from the hole axis already at the nozzle outlet, which is caused by internal flow characteristics.

Quantitative characterization of edge enhancement in phase contrast x-ray imaging

2004 ◽  
Vol 31 (6) ◽  
pp. 1372-1383 ◽  
Author(s):  
P. Monnin ◽  
S. Bulling ◽  
J. Hoszowska ◽  
J.-F. Valley ◽  
R. Meuli ◽  
...  
Keyword(s):  
Phase Contrast ◽  
Edge Enhancement ◽  
Quantitative Characterization ◽  
X Ray ◽  
X Ray Imaging

scholarly journals Experience with Imaging by Using of Microfocus X-Ray Source

2010 ◽  
Vol 61 (5) ◽  
pp. 287-290 ◽  
Author(s):  
Zdenko Zápražný ◽  
Dušan Korytár ◽  
František Dubecký ◽  
Vladimír Áč ◽  
Zbigniew Stachura ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Phase Contrast ◽  
Ccd Camera ◽  
X Ray ◽  
X Ray Imaging ◽  
Radiation Sources ◽  
Set Up ◽  
High Level ◽  
Very High

Experience with Imaging by Using of Microfocus X-Ray SourceIn this paper we present the current work and experience with using microfocus x-ray generator and commercial CCD camera for x-ray imaging purpose. There is a need in laboratories for the development of imaging methods approaching synchrotron radiation sources, where the brilliance of radiation is on very high-level. Generally, there is no continuous access to synchrotron facilities. Several synchrotron radiation laboratories allocate the access via a proposal system. Thus the time for synchrotron radiation experiments seldom exceeds more than 1-2 weeks per year, which restricts its application to a few selected experiments. Even in future, the routine characterization of samples will be performed mainly at the experimenters home laboratories [10]. In this contribution we show that with the present set-up it is possible to achieve the spatial resolution down to μm and with the appropriate geometry a phase contrast images are observable.

scholarly journals Quantitative characterization of inertial confinement fusion capsules using phase contrast enhanced x-ray imaging

2005 ◽  
Vol 97 (6) ◽  
pp. 063103 ◽  
Author(s):  
B. J. Kozioziemski ◽  
J. A. Koch ◽  
A. Barty ◽  
H. E. Martz ◽  
Wah-Keat Lee ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Phase Contrast ◽  
Inertial Confinement ◽  
Quantitative Characterization ◽  
X Ray ◽  
X Ray Imaging ◽  
Contrast Enhanced ◽  
Confinement Fusion

The characterization of a phase contrast x-ray imaging prototype

2007 ◽  
Author(s):  
Molly Donovan ◽  
Da Zhang ◽  
Wei R. Chen ◽  
Hong Liu
Keyword(s):  
Phase Contrast ◽  
X Ray ◽  
X Ray Imaging

scholarly journals Principles of Different X-ray Phase-Contrast Imaging: A Review

2021 ◽  
Vol 11 (7) ◽  
pp. 2971
Author(s):  
Siwei Tao ◽  
Congxiao He ◽  
Xiang Hao ◽  
Cuifang Kuang ◽  
Xu Liu
Keyword(s):  
Biological Samples ◽  
Phase Contrast ◽  
Recent Progress ◽  
Phase Contrast Imaging ◽  
Contrast Imaging ◽  
X Ray ◽  
X Ray Imaging ◽  
Internal Structures ◽  
X Ray Absorption ◽  
Made In

Numerous advances have been made in X-ray technology in recent years. X-ray imaging plays an important role in the nondestructive exploration of the internal structures of objects. However, the contrast of X-ray absorption images remains low, especially for materials with low atomic numbers, such as biological samples. X-ray phase-contrast images have an intrinsically higher contrast than absorption images. In this review, the principles, milestones, and recent progress of X-ray phase-contrast imaging methods are demonstrated. In addition, prospective applications are presented.

scholarly journals Visualization Ability of Phase-Contrast Synchrotron-Based X-Ray Imaging Using an X-Ray Interferometer in Soft Tissue Tumors

2021 ◽  
Vol 20 ◽  
pp. 153303382110101
Author(s):  
Thet-Thet Lwin ◽  
Akio Yoneyama ◽  
Hiroko Maruyama ◽  
Tohoru Takeda
Keyword(s):  
Computed Tomography ◽  
Soft Tissue ◽  
Spatial Resolution ◽  
Phase Contrast ◽  
Soft Tissue Tumors ◽  
X Ray ◽  
3 Dimensional ◽  
Computed Tomography Images ◽  
X Ray Imaging ◽  
X Ray Computed

Phase-contrast synchrotron-based X-ray imaging using an X-ray interferometer provides high sensitivity and high spatial resolution, and it has the ability to depict the fine morphological structures of biological soft tissues, including tumors. In this study, we quantitatively compared phase-contrast synchrotron-based X-ray computed tomography images and images of histopathological hematoxylin-eosin-stained sections of spontaneously occurring rat testicular tumors that contained different types of cells. The absolute densities measured on the phase-contrast synchrotron-based X-ray computed tomography images correlated well with the densities of the nuclear chromatin in the histological images, thereby demonstrating the ability of phase-contrast synchrotron-based X-ray imaging using an X-ray interferometer to reliably identify the characteristics of cancer cells within solid soft tissue tumors. In addition, 3-dimensional synchrotron-based phase-contrast X-ray computed tomography enables screening for different structures within tumors, such as solid, cystic, and fibrous tissues, and blood clots, from any direction and with a spatial resolution down to 26 μm. Thus, phase-contrast synchrotron-based X-ray imaging using an X-ray interferometer shows potential for being useful in preclinical cancer research by providing the ability to depict the characteristics of tumor cells and by offering 3-dimensional information capabilities.

Multipixel characterization of imaging CZT detectors for hard x-ray imaging and spectroscopy

2004 ◽  
Author(s):  
Santosh V. Vadawale ◽  
Jae Sub Hong ◽  
Jonathan E. Grindlay ◽  
Peter Williams ◽  
Minhua Zhang ◽  
...  
Keyword(s):  
X Ray ◽  
X Ray Imaging ◽  
Imaging And Spectroscopy ◽  
Czt Detectors

A Microfocal Method for Phase-Contrast X-Ray Imaging

2009 ◽  
Vol 43 (4) ◽  
pp. 156-160
Author(s):  
N. N. Blinov ◽  
A. Yu. Vasil’ev ◽  
N. S. Serova ◽  
A. Yu. Gryaznov ◽  
N. N. Potrakhov
Keyword(s):  
Phase Contrast ◽  
X Ray ◽  
X Ray Imaging
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