Relevant bibliographies by topics / Velocity on the wall

Academic literature on the topic 'Velocity on the wall'

Author: Grafiati
Published: 30 May 2022
Last updated: 31 May 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Contents

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Velocity on the wall.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Velocity on the wall"

1

Mizuno, Yoshinori, and Javier Jiménez. "Wall turbulence without walls." Journal of Fluid Mechanics 723 (April 16, 2013): 429–55. http://dx.doi.org/10.1017/jfm.2013.137.

Full text
Abstract:
AbstractWe perform direct numerical simulations of turbulent channels whose inner layer is replaced by an off-wall boundary condition synthesized from a rescaled interior flow plane. The boundary condition is applied within the logarithmic layer, and mimics the linear dependence of the length scales of the velocity fluctuations with respect to the distance to the wall. The logarithmic profile of the mean streamwise velocity is recovered, but only if the virtual wall is shifted to a position different from the location assumed by the boundary condition. In those shifted coordinates, most flow properties are within 5–10 % of full simulations, including the Kármán constant, the fluctuation intensities, the energy budgets and the velocity spectra and correlations. On the other hand, buffer-layer structures do not form, including the near-wall energy maximum, and the velocity fluctuation profiles are logarithmic, strongly suggesting that the logarithmic layer is essentially independent of the near-wall dynamics. The same agreement holds when the technique is applied to large-eddy simulations. The different errors are analysed, especially the reasons for the shifted origin, and remedies are proposed. It is also shown that the length rescaling is required for a stationary logarithmic-like layer. Otherwise, the flow evolves into a state resembling uniformly sheared turbulence.
APA, Harvard, Vancouver, ISO, and other styles
2

Kind, R. J., F. M. Yowakim, and S. A. Sjolander. "The Law of the Wall for Swirling Flow in Annular Ducts." Journal of Fluids Engineering 111, no. 2 (June 1, 1989): 160–64. http://dx.doi.org/10.1115/1.3243617.

Full text
Abstract:
Expressions for the logarithmic portion of the law of the wall are derived for the axial and tangential velocity components of swirling flow in annular ducts. These expressions involve new shear-velocity scales and curvature terms. They are shown to agree well with experiment over a substantial portion of the flow near both walls of an annulus. The resultant velocity data also agree with the law of the wall. The success of the proposed logarithmic expressions implies that the mixing-length model used in deriving them correctly describes flow-velocity behavior. This model indicates that the velocity gradient at any height y in the near-wall region is determined by the wall shear stress, not by the local shear stress. This suggests that the influence of wall shear stress is dominant and that it determines the near-wall wall flow even in flows with curvature and pressure gradient. A physical explanation is suggested for this.
APA, Harvard, Vancouver, ISO, and other styles
3

Ryu, Jisu, and Hyun-Woo Lee. "Current-induced domain wall motion: Domain wall velocity fluctuations." Journal of Applied Physics 105, no. 9 (May 2009): 093929. http://dx.doi.org/10.1063/1.3125522.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Laín, Santiago, and Andres D. Caballero. "Simulation of unsteady blood flow dynamics in the thoracic aorta." Ingeniería e Investigación 37, no. 3 (September 1, 2017): 92–101. http://dx.doi.org/10.15446/ing.investig.v37n3.59761.

Full text
Abstract:
In this work, blood flow dynamics was analyzed in a realistic thoracic aorta (TA) model under unsteady-state conditions via velocity contours, secondary flow, pressure and wall shear stress (WSS) distributions. Our results demonstrated that the primary flow velocity is skewed towards the inner wall of the ascending aorta; but this skewness shifts towards the posterior wall in the aortic arch and then towards the anterior-outer wall in the descending aorta. Within the three arch branches, the flow velocity is skewed to the distal walls with flow reversal along the proximal walls. Strong secondary flow motion is observed in the TA, especially at the inlet of the arch branches. WSS is highly dynamic, but was found to be the lowest along the proximal walls of the arch branches. Finally, pressure was found to be low along the inner aortic wall and in the proximal walls of the arch branches, and high around the three stagnation regions distal to the arch branches and along the outer wall of the ascending aorta.
APA, Harvard, Vancouver, ISO, and other styles
5

Seth, G. S., S. Sarkar, and O. D. Makinde. "Combined Free and Forced Convection Couette-Hartmann Flow in a Rotating Channel with Arbitrary Conducting Walls and Hall Effects." Journal of Mechanics 32, no. 5 (August 17, 2016): 613–29. http://dx.doi.org/10.1017/jmech.2016.70.

Full text
Abstract:
AbstractCombined free and forced convection Couette-Hartmann flow of a viscous, incompressible and electrically conducting fluid in rotating channel with arbitrary conducting walls in the presence of Hall current is investigated. Boundary conditions for magnetic field and expressions for shear stresses at the walls and mass flow rate are derived. Asymptotic analysis of solution for large values of rotation and magnetic parameters is performed to highlight nature of modified Ekmann and Hartmann boundary layers. Numerical solution of non-linear energy equation and rate of heat transfer at the walls are computed with the help of MATHEMATICA. It is found that velocity depends on wall conductance ratio of moving wall and on the sum of wall conductance ratios of both the walls of channel. There arises reverse flow in the secondary flow direction near central region of the channel due to thermal buoyancy force. Thermal buoyancy force, rotation, Hall current and wall conductance ratios resist primary fluid velocity whereas thermal buoyancy force and Hall current favor secondary fluid velocity in the region near lower wall of the channel. Magnetic field favors both the primary and secondary fluid velocities in the region near lower wall of the channel.
APA, Harvard, Vancouver, ISO, and other styles
6

Squire, D. T., N. Hutchins, C. Morrill-Winter, M. P. Schultz, J. C. Klewicki, and I. Marusic. "Applicability of Taylor’s hypothesis in rough- and smooth-wall boundary layers." Journal of Fluid Mechanics 812 (December 28, 2016): 398–417. http://dx.doi.org/10.1017/jfm.2016.832.

Full text
Abstract:
The spatial structure of smooth- and rough-wall boundary layers is examined spectrally at approximately matched friction Reynolds number ($\unicode[STIX]{x1D6FF}^{+}\approx 12\,000$). For each wall condition, temporal and true spatial descriptions of the same flow are available from hot-wire anemometry and high-spatial-range particle image velocimetry, respectively. The results show that over the resolved flow domain, which is limited to a streamwise length of twice the boundary layer thickness, true spatial spectra of smooth-wall streamwise and wall-normal velocity fluctuations agree, to within experimental uncertainty, with those obtained from time series using Taylor’s frozen turbulence hypothesis (Proc. R. Soc. Lond. A, vol. 164, 1938, pp. 476–490). The same applies for the streamwise velocity spectra on rough walls. For the wall-normal velocity spectra, however, clear differences are observed between the true spatial and temporally convected spectra. For the rough-wall spectra, a correction is derived to enable accurate prediction of wall-normal velocity length scales from measurements of their time scales, and the implications of this correction are considered. Potential violations to Taylor’s hypothesis in flows above perturbed walls may help to explain conflicting conclusions in the literature regarding the effect of near-wall modifications on outer-region flow. In this regard, all true spatial and corrected spectra presented here indicate structural similarity in the outer region of smooth- and rough-wall flows, providing evidence for Townsend’s wall-similarity hypothesis (The Structure of Turbulent Shear Flow, vol. 1, 1956).
APA, Harvard, Vancouver, ISO, and other styles
7

Papadopoulos, G., and M. V. O¨tu¨gen. "Separating and Reattaching Flow Structure in a Suddenly Expanding Rectangular Duct." Journal of Fluids Engineering 117, no. 1 (March 1, 1995): 17–23. http://dx.doi.org/10.1115/1.2816809.

Full text
Abstract:
The incompressible turbulent flow over a backward-facing step in a rectangular duct was investigated experimentally. The side wall effects on the core flow were determined by varying the aspect ratio (defined as the step span-to-height ratio) from 1 to 28. The Reynolds number, based on the step height and the oncoming free-stream velocity, was 26,500. Detailed velocity measurements were made, including the turbulent stresses, in a region which extended past the flow reattachment zone. Wall static pressure was also measured on both the step and flat walls. In addition, surface visualizations were obtained on all four walls surrounding the separated flow to supplement near-wall velocity measurements. The results show that the aspect ratio has an influence on both the velocity and wall pressure even for relatively large aspect ratios. For example, in the redevelopment region downstream of reattachment, the recovery pressure decreases with smaller aspect ratios. The three-dimensional side wall effects tend to slow down the relaxation downstream of reattachment for smaller aspect ratios as evidenced by the evolution of the velocity field. For the two smallest aspect ratios investigated, higher centerplane streamwise and transverse velocities were obtained which indicate a three-dimensional mean flow structure along the full span of the duct.
APA, Harvard, Vancouver, ISO, and other styles
8

Azatov, Aleksandr, and Miguel Vanvlasselaer. "Bubble wall velocity: heavy physics effects." Journal of Cosmology and Astroparticle Physics 2021, no. 01 (January 27, 2021): 058. http://dx.doi.org/10.1088/1475-7516/2021/01/058.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Rojas, J., J. H. Whitelaw, and M. Yianneskis. "Forced Convective Heat Transfer in Curved Diffusers." Journal of Heat Transfer 109, no. 4 (November 1, 1987): 866–71. http://dx.doi.org/10.1115/1.3248196.

Full text
Abstract:
Measurements of the velocity characteristics of the flows in two curved diffusers of rectangular cross section with C and S-shaped centerlines are presented and related to measurements of wall heat transfer coefficients along the heated flat walls of the ducts. The velocity results were obtained by laser-Doppler anemometry in a water tunnel and the heat transfer results by liquid crystal thermography in a wind tunnel. The thermographic technique allowed the rapid and inexpensive measurement of wall heat transfer coefficents along flat walls of arbitrary boundary shapes with an accuracy of about 5 percent. The results show that an increase in secondary flow velocities near the heated wall causes an increase in the local wall heat transfer coefficient, and quantify the variation for maximum secondary-flow velocities in a range from 1.5 to 17 percent of the bulk flow velocity.
APA, Harvard, Vancouver, ISO, and other styles
10

Kim, W. J., S. M. Seo, T. D. Lee, and K. J. Lee. "Oscillatory domain wall velocity of current-induced domain wall motion." Journal of Magnetism and Magnetic Materials 310, no. 2 (March 2007): 2032–34. http://dx.doi.org/10.1016/j.jmmm.2006.10.943.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Velocity on the wall"

1

Gresko, Lawrence Sebastian. "Characteristics of wall pressure and near-wall velocity in a flat plate turbulent boundary layer." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14373.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Österberg, Klas. "Vascular wall responses to bypass grafting : studies in mice /." Göteborg : Dept. of Molecular and Clinical Medicine, Vascular Surgery, Institute of Medicine, Sahlgrenska Academy at Göteborg University, 2008. http://hdl.handle.net/2077/9437.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Disotell, Kevin James. "A semi-empirical model of the wall-normal velocity induced by flow-shaping plasma actuators." Connect to resource, 2010. http://hdl.handle.net/1811/45413.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Hurst, Edward. "A numerical study of turbulent drag reduction using streamwise travelling waves of spanwise wall velocity." Thesis, University of Warwick, 2013. http://wrap.warwick.ac.uk/67161/.

Full text
Abstract:
A parallelisation of the fully-implicit fractional step based in-house DNS code was implemented. Utilising this, DNS of streamwise travelling waves of spanwise wall velocity in a turbulent channel flow were performed at Reτ = 200; 400; 800 and 1600, scaling the input parameters in wall units. Studying the drag reduction at varying Reynolds number showed that the maximum drag reduction decreased as Re was increased. The scaling with Reynolds number was dependent on the control parameters and therefore the optimal parameters changed with Re. An oscillation in the drag reduction over the forcing period was observed and associated with strong variations in the turbulent statistics, angling of the streaks and coherent structures, and the deterioration of the drag reduction. The conditionally averaged λ2 structures were found and behaved differently depending on the sign of the vorticity. This included a strong angling of the structure which rotated in agreement with the wall velocity, and this angle reduced over the half- period. The λ2 structures were moved away from the wall over the period, a feature also visible in the variation of the vorticity fluctuations. The relationship between the drag reduction and the extrema of the turbulent profiles were compared, and showed a good correlation between the maximum of the v rms profile and the DR achieved. This was seen to be independent of Reynolds number when the maximum v rms of the no control flow was subtracted. The variation of the power spent and net power saving with Reynolds number was also studied. The power spent scaled well with Reτ-0.16, and the net power saving scaled differently depending on the control parameters used. Although the maximum value was reduced as the Reynolds number increased.
APA, Harvard, Vancouver, ISO, and other styles
5

Köhler, Uwe. "3D phase contrast MRI : velocity-field visualisation and wall shear rate calculation in major arteries." Thesis, University of Edinburgh, 2000. http://hdl.handle.net/1842/22384.

Full text
Abstract:
Approximately half of all deaths in the developed world arise from cardiovascular disease, primarily caused by the deposition of atheroma within major arteries. It has been observed that atheroma is deposited preferentially in regions along the outer wall of bifurcations, and along the distal part of the inner wall of bends. These are regions associated with disturbances of the blood flow that display abnormal shear rate (spatial velocity gradient at the vessel wall). Thus, in order to facilitate clinical diagnoses, it is important to visualise the structure and haemodynamic properties of arteries and veins. Magnetic resonance imaging (MRI) is well suited for volume imaging and can be made sensitive to flow. Quantitative velocity measurements are possible using phase contrast (PC) MRI. The aim of this project was the provision of a method that provides information on wall shear rate vectors using MRI. To handle the large number of images acquired in PC MRI automated flow detection algorithms were developed. Three different algorithms were identified: one operating on magnitude MRI images only and two methods which additionally use the velocity information generated from in-vivo and in-vitro acquisitions. These algorithms are based on an edge detection method and were tested on phantoms. The post processing steps necessary to calculate wall shear stress involved the fit of smooth functions to the velocity data, the detection of walls and the calculation of the wall shear rate vector based on that information. Fitting a smooth function removed residual noise and allowed the calculation of spatial derivatives. The velocity data was satisfactorily described by a segmented fifth order polynomial fit. One method of vessel wall reconstruction was based on the fitted velocity field, while another one utilised the detected flow regions. Using the surface position and normals, the wall shear rate was calculated from the shear stress tensor. All post-processing steps were integrated in a purpose built program that enabled graphical user interactions. The calculated wall shear rate values were quantitatively verified with experiments on various phantoms and simulations, and qualitatively compared with computational fluid dynamics calculations. It is shown that a method to calculate reliably wall shear rate directly from time averaged PC MRI acquisitions has been established.
APA, Harvard, Vancouver, ISO, and other styles
6

Loth, Francis. "Velocity and wall shear measurements inside a vascular graft model under steady and pulsatile flow conditions." Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/15907.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Tamtomo, Kiono Berkah Fajar. "Study of wall velocity gradient and mass transfer on rotating cylinder and finned-cylinder in crossflow." Valenciennes, 2002. https://ged.uphf.fr/nuxeo/site/esupversions/2de35dda-200e-4237-8d4b-574007c70bf2.

Full text
Abstract:
Ce travail porte sur la mesure du frottement pariétal et du transfert de masse, sur un cylindre nu et sur un cylindre muni d'une ailette en rotation perpendiculairement à un écoulement, à l'aide de la méthode polarographique. Les mesures ont été réalisées pour différents nombres de Reynolds et pour différentes valeurs du paramètre α, représentant le rapport entre la vitesse périphérique du cylindre et celle de l'écoulement au loin. Une méthode inverse de transfert de masse a pemis la correction directe des signaux électrochimiques. Le frottement pariétal ainsi obtenu sur le cylindre tourne dans le sens inverse de l'écoulement moyen. La mesure du transfert de masse local autour du cylindre en rotation a permis d'établir une corrélation qui tient compte des effets combinés de la rotation du cylindre et de l'écoulement. Cette corrélation permet d'étendre celle établie dans le cas du transfert de chaleur à une gamme plus grande du nombre de Reynolds. La deuxième partie de ce travail concerne la mesure locale du frottement sur une ailette fixée au cylindre. Les valeurs locales élevées du frottement pariétal sur l'ailette sont interprétées à l'aide du modèle de tourbillon en "fer à cheval". On montre que pour les faibles valeurs de α, l'évolution du frottement instationnaire sur l'ailette est semblable à celle observée dans le cas stationnaire. Lorsque la vitesse de rotation su cylindre augmente, la distribution du frottement pariétal tend vers celle obtenue dans le cas du fluide au repos. L'analogie de Reynolds a permis d'atablir une corrélation entre le nombre de Reynolds de rotation et le nombre de Nusselt moyen calculé sur l'ailette
This works deals with the measurement of the wall shear stress and mass transfer around a rotating cylinder alone and a rotating finned cylinder in cross flow by using the polarographic method for different Reynolds numbers and different α (peripheral speed/streamwise velocity). An inverse mass transfer method permits to correct the electronical signal. The corrected wall hear stress around the rotating cylinder show the presence of complex structures, especially in the upstream moving wall region. The mass transfer measured on the rotating cylinder leads to a correlation that takes into account the combined effects of rotation and cross flow. The second part of this work concerns the local measurement of the wall shear stress on the fin fixed to the cylinder. The high values of the wall shear stress measured on the fin are attributed to "horseshoe" vortices. It is shown that for low values of α, the distribution of the unsteady wall shear stress on the fin is similar to that observed in the steady case. Whan the rotation speed increases, the distribution of the wall shear stress tends towards that obtained in fluid at rest. A correlation between the rotation Reynolds number and mean Nusselt number on the fin is proposed by using a Reynolds analogy
APA, Harvard, Vancouver, ISO, and other styles
8

Blake, James R. "On the assessment of blood velocity and wall shear rate in arteries with Doppler ultrasound : a validation study." Thesis, University of Edinburgh, 2008. http://hdl.handle.net/1842/4195.

Full text
Abstract:
Cardiovascular disease, mostly atherosclerosis, is responsible for one third of all deaths globally, rising to more than 50% in the Western World. Risk factors include smoking, diet, and familial history. Doppler ultrasound can provide estimates of blood velocity and wall shear rate. Clinically, maximum velocity is used to categorise patients for surgery, although Doppler velocity measurement is prone to errors and in need of validation. Wall shear stress—which can be derived from wall shear rate—plays a role in disease initiation and progression, although its clinical utility is unclear due to difficulties associated with its measurement. This thesis investigates the use of Doppler ultrasound as a tool to estimate blood velocity and wall shear rate. A simplified method for estimation of wall shear rate in healthy arteries is developed that uses spectral Doppler ultrasound. This method is based upon the theory of oscillatory flow in rigid pipes, requiring two measurements that are readily available with clinical ultrasound machines. This method is compared to a similar method based on colour flow imaging. The spectral Doppler method underestimated the theoretic value of wall shear rate by between 7 and 22%, with results varying between phantoms. Errors for the colour method were on average 35% greater. Test measurements from one healthy volunteer demonstrated that this method can be applied in-vivo. In more advanced stages of disease, peak velocity distal to a stenosis is of clinical interest and the simplified method for wall shear rate estimation is invalid. Steady flow in a series of simplified stenosis geometries was studied using a dual-beam Doppler system to obtain velocity vectors. These measurements were compared with data from an equivalent system that used particle image velocimetry (PIV) and was considered the gold standard. For Reynolds numbers at the stenosis throat of less than 800, flow remained laminar over the region studied, although distal flow separation did occur. For higher throat Reynolds numbers—corresponding to more severe stenoses or increased flow rates—asymmetric recirculation regions developed; the transition to turbulence occurred more proximally, with a corresponding reduction in stenotic jet and recirculation length. Qualitative agreement was observed in the velocity profile shapes measured using ultrasound and PIV at throat Reynolds numbers less than 800. Above this threshold the qualitative agreement between the velocity profiles became poorer as both downstream distance and the degree of stenosis increased. Peak axial velocity distal to the stenosis was underestimated, on average, by 15% in the ultrasound system. Estimation of shear rate remained difficult with both experimental techniques. Under a Newtonian approximation, the normalised wall shear stresses agree qualitatively. Under pulsatile flow conditions using an idealised flow waveform, superior qualitative agreement was observed in the velocity profiles at diastole than at systole. Similar to the steady flow behaviour, this agreement deteriorated with stenosis severity. The current generation of clinical ultrasound machines are capable of estimating the wall shear rate in healthy arteries. In the presence of significant arterial disease, errors in the peak velocity may result in mis-selection of patients for surgery, while estimation of the wall shear stress remains extremely problematic; particularly with identifying the wall location and measuring velocities close to the wall.
APA, Harvard, Vancouver, ISO, and other styles
9

Lunt, Tilmann. "Experimental investigation of the plasma-wall transition." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2008. http://dx.doi.org/10.18452/15837.

Full text
Abstract:
In der vorliegenden Arbeit wurde das Strömungsverhalten eines magnetisierten Argonplasmas beim Auftreffen auf eine neutralisierende Oberfläche untersucht. Mit Hilfe der Laserinduzierten Fluoreszenz wurde dazu nicht-invasiv die Geschwindigkeitsverteilung der Ionen mit einer Ortsauflösung von standardmäßig dz=0.5 mm als Funktion des Abstandes zur Oberfläche gemessen. Zwei Situationen wurden untersucht (a): praktisch das ganze Plasma strömt auf ein großes Target (Durchmesser 100 mm) und (b) die Größe des Targets ist wesentlich kleiner (Durchmesser 15 mm) als der Durchmesser der Plasmasäule. Unmittelbar vor der Oberfläche war in beiden Fällen die Strömungsgeschwindigkeit u mindestens so groß wie die Ionenschallgeschwindigkeit cs, genau wie von Bohm bereits 1949 vorhergesagt[]. Unter fusionsrelevanten Bedingungen ist dies die erste direkte Beobachtung des Bohmkriteriums. Bei Annäherung an die Oberfläche steigt die Machzahl M=u/cs von 0.5 auf 1 auf typischen Skalenlängen lambda_a=30 mm bzw. lambda_b=5 mm an. Um diese kurzen Längen erklären zu können wurden die Messdaten in (a) mit einem Stoß-Diffusionsmodell und im Falle von (b) mit dem Modell von Hutchinson[] verglichen. Eine gute Übereinstimmung in (a) wurde erzielt, wenn eine sehr niedrige Neutralgastemperatur von etwa 400 K angenommen wird. Die Messdaten in (b) werden sehr gut durch das Modell wiedergegeben, wenn ein Transportkoeffizient von D=20 m²/s angenommen wird. Ein derartig hoher Transport kann unmöglich allein durch Diffusion verursacht werden. Teilweise kann dieser Transport anhand der endlichen Gyroradien erklärt werden, vermutlich aber spielen auch zeitabhängige Phänomene, wie z.B. Driftwellen eine wichtige Rolle. Weiterhin wurde die Abhängigkeit von dem Winkel zwischen Flächennormalen und B-Feld untersucht. Die unmittelbar vor der Oberfläche auftretenden Überschallströmungen werden verhältnismäßig gut von dem Modell von Chodura[] beschrieben. Im Gegensatz dazu ist die Größe der Zone in der Machzahlen größer eins auftreten deutlich kleiner, als vom Modell vorhergesagt.
In the present work the streaming behavior of a magnetized argon plasma impinging on a neutralizing surface was investigated. For that purpose the ion velocity distribution was measured non-invasively as a function of the distance to the surface by means of Laser Induced Fluorescence. The spatial resolution was typically dz=0.5 mm. Two situations are investigated, (a): when practically the whole plasma streams onto a large target (diameter 100 mm), and (b): when the size of the target (diameter 15 mm) is significantly smaller than the diameter of the plasma column. In both cases the streaming velocity u was at least as high as the ion acoustic sound speed, as already predicted by Bohm in 1949. Under fusion relevant conditions this is the first direct observation of the Bohm criterion. Approaching the target surface the Mach number M=u/c_s increases from values of around 0.5 to 1 on typical scales of lambda_a=30 mm and lambda_b=5 mm, respectively. In order to explain these very short scale lengths the measured data were compared with a collisional-diffusive model in the case of (a) and with Hutchinson''s model[] in the case of (b). A good agreement was achieved in (a) by assuming a very low neutral gas temperature of about 400 K. In (b) the model fits the data excellently when the transport coefficient is chosen as high as D=20 m²/s. Such a high transport cannot be caused solely by diffusion. Partly it is explained by finite gyro-radii effects, but presumably time dependent phenomena, like drift waves, play an important role. In addition the dependence on the angle between surface normal and B-field was investigated. The supersonic fluxes found in the immediate vicinity of the surface are described fairly well by the model developed by Chodura[]. By contrast the size of the region, where Mach numbers greater one appear is significantly smaller than predicted.
APA, Harvard, Vancouver, ISO, and other styles
10

Bermuske, Mike, Lars Büttner, and Jürgen Czarske. "Measurement uncertainty budget of an interferometric flow velocity sensor." SPIE, 2017. https://tud.qucosa.de/id/qucosa%3A35151.

Full text
Abstract:
Flow rate measurements are a common topic for process monitoring in chemical engineering and food industry. To achieve the requested low uncertainties of 0:1% for flow rate measurements, a precise measurement of the shear layers of such flows is necessary. The Laser Doppler Velocimeter (LDV) is an established method for measuring local flow velocities. For exact estimation of the flow rate, the flow profile in the shear layer is of importance. For standard LDV the axial resolution and therefore the number of measurement points in the shear layer is defined by the length of the measurement volume. A decrease of this length is accompanied by a larger fringe distance variation along the measurement axis which results in a rise of the measurement uncertainty for the flow velocity (uncertainty relation between spatial resolution and velocity uncertainty). As a unique advantage, the laser Doppler profile sensor (LDV-PS) overcomes this problem by using two fan-like fringe systems to obtain the position of the measured particles along the measurement axis and therefore achieve a high spatial resolution while it still offers a low velocity uncertainty. With this technique, the flow rate can be estimated with one order of magnitude lower uncertainty, down to 0:05% statistical uncertainty.1 And flow profiles especially in film flows can be measured more accurately. The problem for this technique is, in contrast to laboratory setups where the system is quite stable, that for industrial applications the sensor needs a reliable and robust traceability to the SI units, meter and second. Small deviations in the calibration can, because of the highly position depending calibration function, cause large systematic errors in the measurement result. Therefore, a simple, stable and accurate tool is needed, that can easily be used in industrial surroundings to check or recalibrate the sensor. In this work, different calibration methods are presented and their in uences to the measurement uncertainty budget of the sensor is discussed. Finally, generated measurement results for the film flow of an impinging jet cleaning experiment are presented.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Velocity on the wall"

1

Rhodes, Stephen. The velocity of money: A novel of Wall Street. New York: W. Morrow and Co., 1997.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Rhodes, Stephen. The velocity of money: A novel of Wall Street. New York: W. Morrow and Co., 1997.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Pruett, C. David. On the wall-normal velocity of the compressible boundary-layer equations. Hampton, Va: Langley Research Center, 1991.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Johnson, D. A. A laser Doppler velocimeter approach for near-wall three-dimensional turbulence measurements. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1990.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Sandborn, Virgil A. Water flow measurements in a 180 degree turn-around duct. Fort Collins, Colo: Colorado State University, 1989.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Velocity. New York: Bantam Books, 2012.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

McCloy, Kristin. Velocity. New York: Random House, 1988.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Velocity. London: Scholastic, 2015.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Krygowski, Nancy. Velocity. Pittsburgh, PA: University of Pittsburgh Press, 2008.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Krygowski, Nancy. Velocity. Pittsburgh, Pa: University of Pittsburgh Press, 2007.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Velocity on the wall"

1

Drozdz, J., R. Erbel, and J. Zamorano. "Aortic Wall Velocity." In Atlas of Tissue Doppler Echocardiography — TDE, 115–31. Heidelberg: Steinkopff, 1995. http://dx.doi.org/10.1007/978-3-642-47067-7_12.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Nazarenko, Nelli N., and Anna G. Knyazeva. "Transfer of a Biological Fluid Through a Porous Wall of a Capillary." In Springer Tracts in Mechanical Engineering, 503–20. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60124-9_22.

Full text
Abstract:
AbstractThe treatise proposes a model of biological fluid transfer in a dedicated macropore with microporous walls. The distribution of concentrations and velocity studies in the capillary wall for two flow regimes—convective and diffusive. The largest impact on the redistribution of concentration between the capillary volume and its porous wall is made by Darcy number and correlation of diffusion coefficients and concentration expansion. The velocity in the interface vicinity increases with rising pressure in the capillary volume or under decreasing porosity or without consideration of the concentration expansion.
APA, Harvard, Vancouver, ISO, and other styles
3

Yang, Shuqing. "Wall-Normal Velocity, Turbulent Structures and Sediment Transport." In Advances in Water Resources and Hydraulic Engineering, 907–12. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89465-0_159.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Koothur, Vipin, and Baburaj A. Puthenveettil. "Velocity of Line Plumes on the Hot Plate in Turbulent Natural Convection." In Progress in Wall Turbulence 2, 181–90. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20388-1_16.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Naka, Yoshitsugu, Michel Stanislas, Jean-Marc Foucaut, Sebastien Coudert, and Jean-Philippe Laval. "Three-Dimensional Structure of Pressure–Velocity Correlations in a Turbulent Boundary Layer." In Progress in Wall Turbulence 2, 103–13. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20388-1_9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Nathan, P., and P. E. Hancock. "Near-wall velocity and wall shear stress correlations in a separating boundary layer." In Springer Proceedings in Physics, 939. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03085-7_237.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Sandham, N. D. "Instability Considerations for Velocity Streaks in Near-Wall Turbulence." In Advances in Turbulence VI, 47–50. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0297-8_12.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Priyadarshana, P. A., and J. C. Klewicki. "Reynolds Number Scaling of Wall Layer Velocity-Vorticity Products." In IUTAM Symposium on Reynolds Number Scaling in Turbulent Flow, 117–22. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-94-007-0997-3_20.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Eckelmann, Helmut. "The Structure near the Wall in Turbulent Shear Flow." In The Influence of Polymer Additives on Velocity and Temperature Fields, 209–21. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-82632-0_17.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Pirozzoli, Sergio. "On the Size of the Eddies in the Outer Turbulent Wall Layer: Evidence from Velocity Spectra." In Progress in Wall Turbulence 2, 3–15. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20388-1_1.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Velocity on the wall"

1

JOHN, P., and M. G. SCHMIDT. "BUBBLE WALL VELOCITY IN THE MSSM." In Proceedings of the SEWM2000 Meeting. WORLD SCIENTIFIC, 2001. http://dx.doi.org/10.1142/9789812799913_0036.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Kjelgard, Kristian G., Mathias Tommer, Tor S. Lande, Dag T. Wisland, Stig Stoa, Lars Gunnar Kloboe, and Thor Edvardsen. "Heart wall velocity sensing using pulsed radar." In 2017 IEEE Biomedical Circuits and Systems Conference (BioCAS). IEEE, 2017. http://dx.doi.org/10.1109/biocas.2017.8325157.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Subrahmanyam, Matthew, Brian J. Cantwell, and Juan J. Alonso. "A Universal Velocity Profile for Near-Wall Flows." In AIAA Scitech 2021 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2021. http://dx.doi.org/10.2514/6.2021-0061.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Corodeanu, S., H. Chiriac, N. Lupu, and T. A. Ovari. "Current controlled domain wall velocity in amorphous microwires." In 2017 IEEE International Magnetics Conference (INTERMAG). IEEE, 2017. http://dx.doi.org/10.1109/intmag.2017.8008020.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Ono, Seisui, Daichi Suzuki, Ken Sato, Toru Iwao, and Shinji Yamamoto. "Arc conductance and flow velocity affected by wall radius of wall-stabilized arc." In 2016 IEEE International Conference on Plasma Science (ICOPS). IEEE, 2016. http://dx.doi.org/10.1109/plasma.2016.7534121.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Morrison, Gerald L., Robert B. Winslow, and H. Davis Thames. "Phase Averaged Wall Shear Stress, Wall Pressure and Near Wall Velocity Field Measurements in a Whirling Annular Seal." In ASME 1995 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/95-gt-101.

Full text
Abstract:
The flow field inside a 50% eccentric whirling annular seal operating at a Reynolds number of 24,000 and a Taylor number of 6,600 has been measured using a 3-D laser Doppler anemometer system. Flush mount pressure and wall shear stress probes have been used to measure the stresses (normal and shear) along the length of the stator. The rotor was mounted eccentrically on the shaft so that the rotor orbit was circular and rotated at the same speed as the shaft (a whirl ratio of 1.0). This paper presents mean pressure, mean wall shear stress magnitude and mean wall shear stress direction distributions along the length of the seal. Phase averaged wall pressure and wall shear stress are presented along with phase averaged mean velocity and turbulence kinetic energy distributions located 0.16c from the stator wall where c is the seal clearance. The relationships between the velocity, turbulence, wall pressure and wall shear stress are very complex and do not follow simple bulk flow predictions.
APA, Harvard, Vancouver, ISO, and other styles
7

Kobayashi, T., H. Hayashi, Y. Fujiwara, and S. Shiomi. "Damping parameter and wall velocity of RE-TM films." In INTERMAG Asia 2005: Digest of the IEEE International Magnetics Conference. IEEE, 2005. http://dx.doi.org/10.1109/intmag.2005.1463555.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Hau, Winky L. W., Zhenyu Liu, Jan Korvink, Roland Zengerle, and Jens Ducree. "Near-wall velocity of suspended particles in microchannel flow." In 2008 IEEE 21st International Conference on Micro Electro Mechanical Systems. IEEE, 2008. http://dx.doi.org/10.1109/memsys.2008.4443736.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Friemel, B. H., K. R. Nightingale, L. N. Bohs, and G. E. Trahey. "Wall filtering challenges in two-dimensional vector velocity estimation." In 1993 IEEE Ultasonics Symposium. IEEE, 1993. http://dx.doi.org/10.1109/ultsym.1993.339632.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Stokely, Ernest M., and Malani Mandumula. "Estimation Of Heart Wall Velocity Using The Wigner Distribution." In 1989 Symposium on Visual Communications, Image Processing, and Intelligent Robotics Systems, edited by William A. Pearlman. SPIE, 1989. http://dx.doi.org/10.1117/12.970102.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Velocity on the wall"

1

Menikoff, Ralph, Christina A. Scovel, and Milton S. Shaw. Cylinder Test Wall Velocity: Experimental and Simulated Data. Office of Scientific and Technical Information (OSTI), May 2013. http://dx.doi.org/10.2172/1079963.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Arnold, P. One-loop fluctuation-dissipation formula for bubble-wall velocity. Office of Scientific and Technical Information (OSTI), June 1993. http://dx.doi.org/10.2172/10166314.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

De Ojeda, William, and Candace E. Wark. Instantaneous Velocity and Wall Pressure Features in a Turbulent Boundary Layer. Fort Belvoir, VA: Defense Technical Information Center, July 1997. http://dx.doi.org/10.21236/ada327973.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Salazar, D. V., D. J. Forliti, K. Kuzmich, and E. Coy. Near-Wall Velocity Field Measurements of a Very Low Momentum Flux Transverse Jet. Fort Belvoir, VA: Defense Technical Information Center, June 2014. http://dx.doi.org/10.21236/ada611589.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Keith, William L., and Bruce M. Abraham. The Influence of Convection Velocity on the Turbulent Wall Pressure Wavenumber-Frequency Spectrum. Fort Belvoir, VA: Defense Technical Information Center, April 1995. http://dx.doi.org/10.21236/ada300048.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Treat, Scott C., and John F. Foss. Near Wall Velocity and Vorticity Measurements, In A Very High R(theta) Turbulent Boundary Layer. Fort Belvoir, VA: Defense Technical Information Center, June 2006. http://dx.doi.org/10.21236/ada449849.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Krauss, T., and L. Meyer. Characteristics of turbulent velocity and temperature in a wall channel of a heated rod bundle. Office of Scientific and Technical Information (OSTI), September 1995. http://dx.doi.org/10.2172/107015.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Haering, S., R. Balakrishnan, and R. Kotamarthi. A computational study of turbulent separated flow over a wall-mounted cube at two different Reynolds numbers and incoming velocity profiles. Office of Scientific and Technical Information (OSTI), July 2021. http://dx.doi.org/10.2172/1810324.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Hopper, David R. Measurements of the Effects of Tunnel Wall Proximity on the Velocity Field Upstream of a Rod with Vortex Shedding in Low-Speed Flow. Fort Belvoir, VA: Defense Technical Information Center, April 2000. http://dx.doi.org/10.21236/ada380245.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Blanken, Annelies, Bafrin Abdulmajid, Eva van Geel, Joost Daams, Martin van der Esch, and Michael Nurmohamed. Effect of tumor necrosis factor inhibiting treatment on arterial stiffness and arterial wall thickness in rheumatoid arthritis patients: protocol for a systematic review and planned meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, January 2022. http://dx.doi.org/10.37766/inplasy2022.1.0131.

Full text
Abstract:
Review question / Objective: The aim of this systematic review is to evaluate the effect of TNF inhibiting treatment on arterial stiffness (as measured with pulse wave velocity and augmentation index) and arterial wall thickness (as measured with carotid intima media thickness) in rheumatoid arthritis patients. Condition being studied: Rheumatoid arthritis is a chronic autoimmune disorder, which affects approximately 1% of the population worldwide. Information sources: The following electronic databases will be searched for potentially eligible studies: EMBASE, MEDLINE, ClinicalTrials.gov and WHO International Clinical Trials Registry Platform. For the studies identified as eligible for inclusion, similarity tracking will be used to identify more potentially relevant articles with the ‘related article’ feature in PubMed. In addition, a citation search will be performed for included studies to identify articles that have cited them. Reference lists of the included studies and previous reviews on the subject will be searched for potentially relevant studies. ResearchGate profiles of top authors on the subject will be investigated to identify potentially relevant data points. For ongoing or finished studies that are potentially eligible, but without a publication, study authors will be contacted for information. When additional information is needed, study authors will be contacted as well.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Velocity on the wall' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography