3 edition of Improved visualization of flow field measurements found in the catalog.
Improved visualization of flow field measurements
1991 by National Aeronautics and Space Administration, For sale by the National Technical Information Service in [Washington, DC], [Springfield, Va .
Written in English
|Statement||Jeffrey Hilton Miles.|
|Series||NASA technical memorandum -- 103679.|
|Contributions||United States. National Aeronautics and Space Administration.|
|The Physical Object|
Results. Mean liver volume imaged was cm 3 ± and cm 3 ± at closed arc and open arc cone-beam CT, respectively. The coverage of open arc cone-beam CT was significantly higher compared with closed arc cone-beam CT (97% vs 86% of the MR imaging liver volume, P). In eight patients (53%), tumors were partially or completely outside the closed arc cone-beam CT field . Blood flow is a parameter used to diagnose vascular diseases based on flow speed, blood pressure, and vessel size. Different techniques have been developed to estimate the relative blood flow speed and to improve the visualization of deep blood vessels; one such technique is . Particle image velocimetry (PIV), also known as flow visualization, is an optical measurement technique used to obtain velocity in fluids, which can be employed experimentally to verify CFD-based predictions of flow field.
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Visualization of Flow Direction and Flow Contours Velocity Measurement by Particle Tracing Visualization of Velocity Profiles Visualization of Surface Flow References 3. Optical Flow Visualization Fluid Flow as a Refractive Index Field Visualization by Means of Light Deflection Interferometry Phase Contrast and Book Edition: 2.
Get this from a library. Improved visualization of flow field measurements. [Jeffrey H Miles; United States. National Aeronautics and Space Administration.]. Flow visualization evaluates certain properties of a flow field directly accessible to visual perception.
Organized into five chapters, this book first presents the methods that create a visible flow pattern that could be investigated by visual inspection, such as simple dye and density-sensitive visualization Edition: 1.
Improved visualization of flow field measurements - CORE. Flow field analysis is the key to design and improve a torque converter.
It is the principle test method to research flow field by using laser technique. Making use of Particle Image Velocimetry (PIV) technique tested the flow field of a torque converter.
Digital image processing and analysis were applied to obtain the velocity distribution of internal field. The random-dot pattern mask is replaced with a 2D cosine grid, and Fourier data processing scheme is introduced to reveal orthogonal gradients of the flow field. A preliminary demonstration of the technique has been performed in hypersonic shock tunnel (HST2) facility using a hemispherically shaped test model placed in the flow field at Mach Measurements of the air flow field in the freezer compartment of a its energy consumption can be reduced and its efficiency improved through optimization of the air flow fields inside the compartments.
a commercial unit was equipped with two specially constructed insulated windows which enabled clear visualization of the flow field. Static pressures experiments and flow visualization experiments are performed for the different angles of attack, Reynolds numbers and turbulence intensities, Improved visualization of flow field measurements book.
Table 6 shows the experimental conditions of static pressures measurements and flow visualization experiments (see Fig. Download: Download high-res image (98KB). An improved smoke-wire flow visualization technique using a large capacitor as the power source was proposed.
Electric current discharged from capacitors was used to heat a fine metal wire suspended in the flow field. The oil droplets attached to the wire were vaporized and smoke filaments followed the flow motions.
Intraoperative semi-automated coregistration of 3D intraoperative ultrasound with preoperative rDSA combines the advantages of ultrasound, namely speed, non-invasiveness and visualization beyond the visible field, with an improved anatomical interpretation of the coregistered 3D-US images.
Analysis of vortical flow field related to aero-acoustic sound in an air conditioning system by wall pressure measurement and CFD (1st report, resonance in a duct) Part II: Phase-averaged stereoscopic PIV flow field measurements. Ocean Engineering, Vol. Bringing Topology-Based Flow Visualization to the Application Domain.
Single shot, time-averaged PLIF images of NO and OH were obtained to give flow visualization. Quantitative interpretation was limited by collision quenching.
The errors associated with OH concentration measurements have been assessed . An improved temperature imaging technique  is based on the use of two lasers and two CCD cameras.
The first two of these planes allows for a view of the entire flow field, including the area near the ports. The 11 mm plane allows for visualization of the body as deep into the device as possible before the diaphragm blocks the laser light plane for a significant amount of the cycle.
This is the 2nd edition of the book, Flow Visualization: Techniques and Examples, which was published by Imperial College Press in Many of the chapters have been revised and updated to take into consideration recent changes in a number of flow visualization and measurement techniques, including an updated high quality flow gallery.
In thermal fluid sciences, the understanding of the physical thermal/flow processes can be greatly improved if the flow pattern of interest can be visually observed. In light of this, we produce the following visualization-based courseware as supplement to the teaching of the fluid mechanics.
Whole-field flow measurement and visualization. *In addition to qualitative observations, under certain conditions it is possible to make quantitative measurements from flow visualization data as well.
For example, a measurement of the distance between streamlines in a 2-D incompressible flow provides information on velocity ratios in the flowfield. Information Visualization is the major revision of a classic work on information visualization.
This book explores the art and science of why we see objects the way we do. Based on the science of perception and vision, the author presents the key principles at work for a wide range of applications - resulting in visualization of improved clarity, utility, and persuasiveness.5/5(1).
A key feature of PIV is that it is a quantitative method of flow field mapping where numerous instantaneous velocity vectors within the measurement region can be determined simultaneously.
In contrast, to map the velocity field using point measurement techniques would require that the probe is traversed across the measurement region, which is time consuming and there is a.
Therefore, in addition to Pitot pressure measurements of jet flow fields, rainbow schlieren techniques   are for the first time applied to the free jets issued from the conventional and improved nozzles for quantitative visualization of flow fields at high spatial resolution, and they will enable some progress in the understanding of the.
An Internet Book on Fluid Dynamics Introduction to Flow Visualization Flow visualization is frequently a very important (and sometimes essential) component of a ﬂuid ﬂow experiment. It is particularly important during the process of interpreting other ﬂuid measurements.
Experimental flow visualization is a starting point for flow visualization using computer graphics. The process of computer visualization is described in. Flow visualization is an experimental technique of examining and studying patterns of flow when a fluid flows over or inside an object under study.
American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA Insects in flight: Direct visualization and flow measurements Article Literature Review (PDF Available) in Bioinspiration & Biomimetics 1(4):S January with Reads.
The schlieren technique is an optical method used for flow visualization and has been successfully used for detecting shock waves in supersonic flow or for visualizing turbulent flow .It is also a great tool for heat transfer measurement .However, for micro-scale flow fields the background noise in the schlieren image increases and contrast decreases such that density gradients are.
Visualization and laser measurements on the flow field and sand movement on sand dunes with porous fences Article in Experiments in Fluids 52(4) April with 22 Reads. Flow visualization is an approach focuses on methods to get information from the flow field datasets either in 2 or 3 dimensional.
Researchers have presented many visualization techniques with. Measurements of the internal flow velocity distributions in a cross-flow fan were made by particle-tracking velocimetry (PTV). The flow paths (pathlines) were photographed using a digital camera and analyzed using a computer program developed by Tsurusaki and Urata () in order to obtain the velocity distributions.
Obtaining high quality flow visualization results is, in many ways, more of an art than a science, and experience plays a key deciding role. The depth and breadth of the material will make this book invaluable to readers of all levels of experience in the field.
However, flow visualization has been successfully attempted on other, larger, flying animals. InKokshaysky () identified flows that resembled vortex rings behind birds in slow forward flight, and Spedding produced a series of papers on the wakes of kestrels, jackdaws and pigeons (Speddinga, b, Spedding et al ).
Visualization of Fields and the Divergence and Curl. A three-dimensional vector field A (r) is specified by three components that are, individually, functions of position. It is difficult enough to plot a single scalar function in three dimensions; a plot of three is even more difficult and hence less useful for visualization purposes.
Keywords: Scientific Visualization, volume rendering, flow visualization ABSTRACT As simulations have migrated towards three -dimensions, new tools for examining the resulting complex datasets have been required. Much progress has been achieved in the area of scientific visualization towards this goal.
Visualization and measurement of the velocity field behind the meniscus of the CD-flow. An example of an image of a CD-flow of water in a glass microchannel obtained using SDDOCT technique is.
Hemorheological alterations in the majority of metabolic diseases are always connected with blood rheology disturbances, such as the increase of blood and plasma viscosity, cell aggregation enhancement, and reduction of the red blood cells (RBCs) deformability. Thus, the visualizations and measurements of blood cells deformability flowing in microfluidic devices (point-of-care devices) can.
Flow field measurements inside blowers indicate very complex flow patterns. A detailed flow visualization study was conducted on an actual HVAC fan module operated in water under dynamically similar conditions as those in air with the purpose of studying the complex flow patterns in order to improve the aerodynamic performance of the fan/scroll.
Flometrics conducted a flow visualization test of solution being injected into a simulated artery. The test system consists of a pump capable of simulating pulsatile velocity profiles in the vena cava, a Gemini infusion pump, a peristaltic withdrawal pump, an insertion type flow.
measurement of flow structures induced by a bubbly plume using visualization piv and image measurement Posted By Ken FollettPublic Library TEXT ID e Online PDF Ebook Epub Library presented studies employing fbgs for two phase flow detection in microchannels 19 as an anemometer with a silver coated fbg 20 and for the measurement of flow the rate and.
The present study investigates bubbly two-phase flow in a hydraulic jump using a flow visualization technique. Bubbly two-phase flow is encountered in many engineering problems; however, mainly because of experimental difficulties, little is known on the internal structure of these flows, although such knowledge is clearly essential to a thorough understanding of the mass transfer between the.
Sinha, M., Katz, J., and Meneveau, C. (Novem ). "Quantitative Visualization of the Flow in a Centrifugal Pump With Diffuser Vanes—II: Addressing Passage-Averaged and Large-Eddy Simulation Modeling Issues in Turbomachinery Flows.".
Data visualization is an interdisciplinary field that deals with the graphic representation of is a particularly efficient way of communicating when the data is numerous as for example a Time an academic point of view, this representation can be considered as a mapping between the original data (usually numerical) and graphic elements (for example, lines or points in a chart).
The Flow Visualization Lab is the realization of this axiom in regard to fluid flow. Air is a "watery fluid" and the flow of water, which is more easily visualized than the flow of air, maybe used to learn a great deal about the basic mechanisms involved in both media.
The principal equipment in this lab is a 45 cm x 45 cm test section water.Visuals are now being used as vital planning tools instead of being a byproduct of the design process.
VISUALIZATION TOOLS Key Factors in Determining What Tools Are Used The foundation of most computerized visualization tools is CADD data.
CADD data can be derived from a variety of sources, such as survey data and field measurements.Variables and parameters required to characterize soil water flow and solute transport are often measured at different spatial scales from those for which they are needed.
This poses a problem since results from field and laboratory measurements at one spatial scale are not necessarily valid for application at another. Herein lies a challenge that vadose zone hydrologists are faced with. For.