Relevant bibliographies by topics / Congresses. Fluid dynamic measurements

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Congresses. Fluid dynamic measurements'

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Published: 4 June 2021
Last updated: 4 February 2022

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Journal articles on the topic "Congresses. Fluid dynamic measurements"

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Roodhart, L. P. "Fracturing Fluids: Fluid-Loss Measurements Under Dynamic Conditions." Society of Petroleum Engineers Journal 25, no. 05 (October 1, 1985): 629–36. http://dx.doi.org/10.2118/11900-pa.

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Abstract When filter-cake-building additives are used in fracturing fluids, the commonly applied static, 30-minute API filtration test is unsatisfactory, because in a dynamic situation (like fracturing) the formation of a thick filter cake will be inhibited by the shearing forces of the fracturing fluid. A dynamic, filter-cake-controlled, leakoff coefficient that is dependent on the shear rate and shear stress at the fracture face is, therefore, introduced. A test apparatus has been constructed in which the fluid leakoff is measured under conditions of temperature, rate of shear, duration of shear, and fluid-flow pattern as encountered under fracturing conditions. The effects of rock permeability, shear rate, and differential pressure on the permeability, shear rate, and differential pressure on the dynamic leakoff coefficient are presented for various, commonly used fracturing-fluid/fluid-loss-additive combinations. Introduction An important parameter in hydraulic fracturing design is the rate at which the fracturing fluid leaks into the formation. This parameter, known as fluid loss, not only determines the development of fracture length and width, but also governs the time required for a fracture to heal after the stimulation treatment has been terminated. The standard leakoff test is a static test, in which the effect of shear rate in the fracture on the viscosity of the fracturing fluid and on the filter-cake buildup is ignored. Dynamic vs. Static Tests The three stages in filter-cake buildup arespurt loss during initiation of the filter cake,buildup of filtercake thickness, during which time leakoff is proportional to the square root of time, andlimitation of filter-cake growth by erosion. In the standard API leakoff test, 1 the fracturing fluid, with or without leakoff additives, is forced through a disk of core material under a pressure differential of 1000 psi [7 MPa), and the flow rate of the filtrate is determined. In such a static test, the third stage-erosion of the filter cake-is absent. In a dynamic situation there is an equilibrium whereby flow along the filter cake limits the filter-cake thickness, and the leakoff rate becomes constant. The duration of each of these stages depends on the type of fluid, the type of additive, the rock permeability, and the test conditions. The differences between dynamic and static filtration tests are shown in Fig. 1, where the cumulative filtrate volume (measured in some experiments with the dynamic fluid-loss apparatus described below) is expressed as a function of time (Fig. la) and as a function of the square root of time (Fig. ]b), The shear rate at the surface of the disk is either static (O s -1 ), or 109 s -1 or 611 s -1. The curves indicate that the dynamic filtration velocities are higher than those measured in a static test and increase rapidly with increasing shear rate. This is in agreement with the observations made by Hall, who used an axially transfixed cylindrical core sample along which fracturing fluid was pumped, while the filtrate was collected from a bore through the center. Fig. la shows how the lines were drawn to fit the data: Vc = Vsp + A t + Bt, .........................(1) where Vc = cumulative volume per unit area, t = filtration time, Vsp= spurt loss, A = static leakoff component, andB = dynamic leakoff component. In static leakoff theory, B =0 and then A =2Cw, twice the static leakoff coefficient.-3 Each of the terms in Eq. 1 represents one of the stages in the leakoff process-spurt loss, buildup of filter cake, and erosion of filter cake. Analysis of the experimental data shows that the spurt loss, Vsp, and the static leakoff component, A, are independent of the shear rate, but the dynamic component, B, varies strongly with the shear rate (see Table 1). This means that, the higher the shear rate, the more the leakoff process is controlled by the third stage. process is controlled by the third stage. One model commonly used is based solely on square-root-of-time behavior with a constant spurt loss. Fig. 1 shows that little accuracy is lost by describing the leakoff with a single square-root-of-time equation: Vc = VsP + m t,...........................(2) where the dynamic leakoff coefficient. Cw = 1/2m, depends heavily on shear. and the spurt loss remains the same as in Eq. 1 and independent of the shear rate Table 2 shows that the error in C, that arises as a result of measuring under static conditions can be more than 100%. SPEJ P. 629
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Egger, H., T. Seitz, and C. Tropea. "Enhancement of flow measurements using fluid-dynamic constraints." Journal of Computational Physics 344 (September 2017): 558–74. http://dx.doi.org/10.1016/j.jcp.2017.04.080.

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Jaremkiewicz, Magdalena. "Reduction of dynamic error in measurements of transient fluid temperature." Archives of Thermodynamics 32, no. 4 (December 1, 2011): 55–66. http://dx.doi.org/10.2478/v10173-011-0031-3.

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Reduction of dynamic error in measurements of transient fluid temperatureUnder steady-state conditions when fluid temperature is constant, temperature measurement can be accomplished with high degree of accuracy owing to the absence of damping and time lag. However, when fluid temperature varies rapidly, for example, during start-up, appreciable differences occur between the actual and measured fluid temperature. These differences occur because it takes time for heat to transfer through the heavy thermometer pocket to the thermocouple. In this paper, a method for determinig transient fluid temperature based on the first-order thermometer model is presented. Fluid temperature is determined using a thermometer, which is suddenly immersed into boiling water. Next, the time constant is defined as a function of fluid velocity for four sheated thermocouples with different diameters. To demonstrate the applicability of the presented method to actual data where air velocity varies, the temperature of air is estimated based on measurements carried out by three thermocouples with different outer diameters. Lastly, the time constant is presented as a function of fluid velocity and outer diameter of thermocouple.
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Guibert, Clément, Jérôme Fresnais, Véronique Peyre, and Vincent Dupuis. "Magnetic fluid hyperthermia probed by both calorimetric and dynamic hysteresis measurements." Journal of Magnetism and Magnetic Materials 421 (January 2017): 384–92. http://dx.doi.org/10.1016/j.jmmm.2016.08.015.

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Dugyala, Venkateshwar Rao, Jyothi Sri Muthukuru, Ethayaraja Mani, and Madivala G. Basavaraj. "Role of electrostatic interactions in the adsorption kinetics of nanoparticles at fluid–fluid interfaces." Physical Chemistry Chemical Physics 18, no. 7 (2016): 5499–508. http://dx.doi.org/10.1039/c5cp05959c.

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Hua, Xiaoqing, Joelle Frechette, and Michael A. Bevan. "Nanoparticle adsorption dynamics at fluid interfaces." Soft Matter 14, no. 19 (2018): 3818–28. http://dx.doi.org/10.1039/c8sm00273h.

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Gensterblum, Yves, Amin Ghanizadeh, and Bernhard M. Krooss. "Gas permeability measurements on Australian subbituminous coals: Fluid dynamic and poroelastic aspects." Journal of Natural Gas Science and Engineering 19 (July 2014): 202–14. http://dx.doi.org/10.1016/j.jngse.2014.04.016.

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Thurow, Brian, Naibo Jiang, and Walter Lempert. "Review of ultra-high repetition rate laser diagnostics for fluid dynamic measurements." Measurement Science and Technology 24, no. 1 (October 29, 2012): 012002. http://dx.doi.org/10.1088/0957-0233/24/1/012002.

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Tosatti, Samuele, Rudolf Aeschlimann, Joseph Kakkassery, and Kathrine Lorenz. "Dynamic coefficient of friction measurements of contact lenses in tear-like fluid." Contact Lens and Anterior Eye 38 (February 2015): e29. http://dx.doi.org/10.1016/j.clae.2014.11.040.

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Boonsang, S., and W. Lertkittiwattanakul. "A flash photography method for the measurements of the fluid flow dynamic of a fluid dispensing system." Measurement 102 (May 2017): 57–63. http://dx.doi.org/10.1016/j.measurement.2017.01.050.

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Dissertations / Theses on the topic "Congresses. Fluid dynamic measurements"

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Or, Chun-ming, and 柯雋銘. "Flow development in the initial region of a submerged round jet in a moving environment." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B42664512.

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Or, Chun-ming. "Flow development in the initial region of a submerged round jet in a moving environment." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B42664512.

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Osorno, Andres. "Dynamic, In-Situ Pressure Measurements during CMP." Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7497.

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A rotational setup for measuring interfacial fluid pressure and temperature was successfully constructed. Interfacial fluid measurements were performed with various slurries, slurry flow rates, and pad topographies. It was experimentally determined that the pad topography has the biggest effect in pressure and temperature distribution. This was also confirmed by tilt experiments ran in a rotational environment. For all cases, the edge high conditioned pad displayed the most changes during the experiments. For an edge high conditioned pad, the fluid pressure was found to be mostly subambient reaching levels of up to 42 kPa at the center of the fixture, and dissipating towards the edges. The pressure maps appear to be almost center symmetric. The pressure was found to be positive during the first second of contact, and rapidly turn subambient. The Subambient pressures stabilize after about 5 seconds, and their suction force was found to slow the rotating platen significantly. Suction forces were confirmed by displacement observed during the tilt experiments. The fixtures center was sucked down into the pad up to 20 m, and tends to tilt towards the leading edge. Interfacial temperatures were also found to vary with pad geometry. The edge-high conditioned pad exhibited changes of up to 4 C, concentrated at the center. The relative position and shape of these temperature rises matches the results observed in the pressure experiments. Temperature takes a longer time to reach equilibrium, up to 30 seconds in most measurements.
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Kakade, Vinod. "Fluid Dynamic and Heat Transfer Measurements in Gas Turbine Pre-Swirl Cooling Systems." Thesis, University of Bath, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.503370.

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McCay, JoAnn Margaret 1962. "Fluid velocity measurement by processing images of neutrally-buoyant, phosphorescent tracer particles." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276607.

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A technique for measuring fluid velocities by means of neutrally-buoyant, phophorescent particles was investigated in a small-scale water jet facility. A nitrogen laser briefly illuminated the flow, exciting only those particles resident within the pulsed beam. The particles luminesce for a short while following excitation, during which time they also move with the flow. This creates a visible particle streak, the intensity of which decays along the direction of motion. A strobe illuminates the particles again a known time following the laser pulse. The magnitude and direction of a particle's velocity in the plane of view are deduced from an image of it streak captured by a video camera and recorded by a digital image processing system.
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Hobbs, Andrew M. "Design and optimization of a vortex particle separator for a hot mix asphalt plant using computational fluid dynamics." Thesis, Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-04192004-101304/unrestricted/hobbs%5Fandrew%5Fm%5F200312%5Fms.pdf.

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Guo, Jiuhao, and 郭九昊. "Velocity field measurement of a scroll vortex intake flow." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B48079881.

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A scroll vortex intake is a hydraulic structure that transfers water stably from one elevation to a lower one by generating a swirling vortex flow down a vertical drop- shaft. Scroll vortex intakes are applied widely in water supply, stormwater drainage and sewerage systems. For a good engineering design, a sufficiently large and stable air core needs to be maintained within the dropshaft. Although a number of the- oretical and experimental investigations have been conducted, the understanding and predictions of the vortex flow is still far from complete due to a lack of de- tailed velocity field and air core measurements. This study aims to achieve a better understanding of the scroll vortex intake flow. The hydraulic theory of scroll vortex intake is revisited and detailed measurements of air core and velocity field of the vortex flow is conducted. A 1:15 physical model of a scroll vortex intake has been designed according to dynamic Froude similitude and constructed. Experiments have been conducted to measure the head-discharge relation. Piezometric head and air core size are measured at the throat of the vortex flow. Velocity fields are measured using Laser Doppler Anemometry (LDA). The measurements show that the vortex flow in the chamber resembles a free vortex and the circulation is approximately equal to that at the inlet to chamber. The chamber flow is not affected by the bottom boundary effect at bottom above a depth of the order of the dropshaft diameter. The throat section of the vor- tex flow is located slightly below the chamber bottom and within the bellmouth at the entrance to dropshaft. For the vortex flow in and downstream of the bell- mouth, the tangential velocity distribution can be described by a Rankine vortex (combination of forced and free vortex); the transition from forced to free vortex occurs at around the middle of the vortex flow layer. The pressure is positive for all locations and all discharges. Due to viscous effect, the maximum circulation is found to be lower than the inlet circulation. Consistent with the free vortex theory, the vertical velocity in the dropshaft is approximately constant. By accounting for the loss of circulation between chamber inlet and the dropshaft, a new 1D theory is proposed. Unlike previous models, the new theory gives good predictions of head-discharge relation and minimum air core size without the need of physically unrealistic assumptions. This study has revealed the structure of a scroll vortex intake flow for the first time. Characteristic flow features of the scroll vortex intake have been elucidated. The findings have helped to explain and resolve the long-standing discrepancies between the theoretical predictions of three representative 1D hydraulic theories. The vortex flow measurements also provide a basis for the development of a new theory and the validation of 3D numerical models.
published_or_final_version
Civil Engineering
Master
Master of Philosophy
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8

Huang, Shengcheng, and 黃晟程. "Effect of ambient turbulence on mixing of a round jet in cross-flow." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/209493.

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Moorty, Shashi. "A parametric study of rigid body-viscous flow interaction." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26723.

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This thesis presents the numerical solution for two-dimensional incompressible viscous flow over a rigid bluff body which is elastically supported or alternately undergoing a specified harmonic oscillations. Solutions for the related associate flow in which the body is at rest in a two-dimensional incompressible time-dependent viscous flow have also been -obtained. This work is an extension of the work by Pattani [19] to include the effect of a steady far field flow on an oscillating body. The numerical model utilizes the finite element method based on a velocity-pressure primitive variable representation of the complete Navier-Stokes equations. Curved isoparametric elements with quadratic interpolation for velocities and bilinear interpolation for pressure are used. Nonlinear boundary conditions on the moving body are represented to the first order in the body amplitude parameter. The method of averaging is used to obtain the resulting periodic motion of the fluid. Three non-dimensional parameters are used to completely characterise the flow problem: the frequency Reynolds number Rω , the Reynolds number of steady flow Rℯ₁ and the Reynolds number for time-dependent flow Rℯ₂. Numerical results are obtained for a circular body, a square body and an equilateral triangular body. A parametric study is conducted for different values of the Reynolds numbers in the viscous flow regime. In all cases, results are obtained for streamlines, streaklines, added mass, added damping, added force and the drag coefficients. The limiting cases of steady flow over a fixed body and an oscillating body in a stationary fluid are checked with known results. Results for the associated flow are also obtained. The transformations derived, between the two associated flows are checked. Good agreement is obtained between the present results and other known results.
Applied Science, Faculty of
Civil Engineering, Department of
Graduate
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Mokhtarian, Farzad. "Fluid dynamics of airfoils with moving surface boundary-layer control." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/29026.

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The concept of moving surface boundary-layer control, as applied to the Joukowsky and NACA airfoils, is investigated through a planned experimental program complemented by theoretical and flow visualization studies. The moving surface was provided by one or two rotating cylinders located at the leading edge, the trailing edge, or the top surface of the airfoil. Three carefully designed two-dimensional models, which provided a wide range of single and twin cylinder configurations, were tested at a subcritical Reynolds number (Re = 4.62 x 10⁴ or Re — 2.31 x 10⁵) in a laminar-flow tunnel over a range of angles of attack and cylinder rotational speeds. The test results suggest that the concept is indeed quite promising and can provide a substantial increase in lift and a delay in stall. The leading-edge rotating cylinder effectively extends the lift curve without substantially affecting its slope. When used in conjunction with a second cylinder on the upper surface, further improvements in the maximum lift and stall angle are possible. The maximum coefficient of lift realized was around 2.22, approximately 2.6 times that of the base airfoil. The maximum delay in stall was to around 45°. In general, the performance improves with an increase in the ratio of cylinder surface speed (Uc) to the free stream speed (U). However, the additional benefit derived progressively diminishes with an increase in Uc/U and becomes virtually negligible for Uc/U > 5. There appears to be an optimum location for the leading-edge-cylinder. Tests with the cylinder at the upper side of the leading edge gave quite promising results. Although the CLmax obtained was a little lower than the two-cylinder configuration (1.95 against 2.22), it offers a major advantage in terms of mechanical simplicity. Performance of the leading-edge-cylinder also depends on its geometry. A scooped configuration appears to improve performance at lower values of Uc/U (Uc/U ≤ 1). However, at higher rates of rotation the free stream is insensitive to the cylinder geometry and there is no particular advantage in using the scooped geometry. A rotating trailing-edge-cylinder affects the airfoil characteristics in a fundamentally different manner. In contrast to the leading-edge-cylinder, it acts as a flap by shifting the CL vs. α plots to the left thus increasing the lift coefficient at smaller angles of attack before stall. For example, at α = 4°, it changed the lift coefficient from 0.35 to 1.5, an increase of 330%. Thus in conjunction with the leading-edge- cylinder, it can provide significant improvements in lift over the entire range of small to moderately high angles of incidence (α ≤ 18°). On the theoretical side, to start with, the simple conformal transformation approach is used to obtain a closed form potential-flow solution for the leading-edge-cylinder configuration. Though highly approximate, the solution does predict correct trends and can be used at a relatively small angle of attack. This is followed by an extensive numerical study of the problem using: • the surface singularity approach including wall confinement and separated flow effects; • a finite-difference boundary-layer scheme to account for viscous corrections; and • an iteration procedure to construct an equivalent airfoil, in accordance with the local displacement thickness of the boundary layer, and to arrive at an estimate for the pressure distribution. Effect of the cylinder is considered either through the concept of slip velocity or a pair of counter-rotating vortices located below the leading edge. This significantly improves the correlation. However, discrepancies between experimental and numerical results do remain. Although the numerical model generally predicts CLmax with a reasonable accuracy, the stall estimate is often off because of an error in the slope of the lift curve. This is partly attributed to the spanwise flow at the model during the wind tunnel tests due to gaps in the tunnel floor and ceiling required for the connections to the externally located model support and cylinder drive motor. However, the main reason is the complex character of the unsteady flow with separation and reattachment, resulting in a bubble, which the present numerical procedure does not model adequately. It is expected that better modelling of the cylinder rotation with the slip velocity depending on a dissipation function, rotation, and angle of attack should considerably improve the situation. Finally, a flow visualization study substantiates, rather spectacularly, effectiveness of the moving surface boundary-layer control and qualitatively confirms complex character of the flow as predicted by the experimental data.
Applied Science, Faculty of
Mechanical Engineering, Department of
Graduate
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Books on the topic "Congresses. Fluid dynamic measurements"

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AIAA Computational Fluid Dynamics Conference (11th 1993 Orlando, Fla.). 11th AIAA Computational Fluid Dynamics Conference: July 6-9, 1993, Orlando, Florida. New York: AIAA, 1993.

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AIAA Computational Fluid Dynamics Conference (14th 1999 Norfolk, Virginia). A collection of technical papers: 14th AIAA Computational Fluid Dynamics Conference, Norfolk, Virginia, 28 June-1 July 1999. Reston, Va: American Institute of Aeronautics and Astronautics, 1999.

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AIAA Computational Fluid Dynamics Conference (13th 1997 Snowmass Village, Co.). A collection of technical papers: 13th AIAA Computational Fluid Dynamics Conference ; Snowmass Village, CO, June 29-July 2, 1997. Reston, Va: American Institute of Aeronautics and Astronautics, 1997.

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Fluid Measurements and Instrumentation Forum (1991 Portland, Or.). Fluid Measurement[s] and Instrumentation Forum--1991: Presented at the first ASME/JSME Fluids Engineering Conference, Portland, Oregeon, June 23-27, 1991. New York, N.Y: American Society of Mechanical Engineers, 1991.

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Fluid Measurements and Instrumentation Forum. (4th 1989 University of California, San Diego). Fluid measurement and instrumentation forum--1989: Presented at the third Joint ASCE/ASME Mechanics Conference, University of California, San Diego, La Jolla, California, July 9-12, 1989. New York, N.Y: American Society of Mechanical Engineers, 1989.

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K, Maslov V., Silʹvestrov S. V, Trokhan A. M, NPO Vsesoi͡uznyĭ nauchno-issledovatelʹskiĭ institut fiziko-tekhnicheskikh i radiotekhnicheskikh izmereniĭ (Soviet Union), and Gosudarstvennyĭ metrologicheskiĭ t͡sentr gidroakusticheskikh izmereniĭ (Russia), eds. Problemy metrologii gidrofizicheskikh izmereniĭ: Tezisy dokladov nauchno-tekhnicheskoĭ konferent͡sii stran SNG. Moskva: NPO "VNIIFTRI", 1992.

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Toronto), Fluid Measurements and Instrumentation Forum (1990 University of. Fluid Measurement[s] and Instrumentation Forum--1990: Presented at the 1990 Spring Meeting of the Fluids Engineering Division held in conjunction with the 1990 Forum of the Canadian Society of Mechanical Engineers, University of Toronto, Toronto, Ontario, Canada, June 4-7, 1990. New York, N.Y: American Society of Mechanical Engineers, 1990.

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ASME/JSME, Fluids Engineering Conference (1st 1991 Portland Or ). Measuring and metering of unsteady flows, 1991: Presented at The First ASME-JSME Fluids Engineering Conference, Portland, Oregon, June 23-27, 1991. New York, N.Y: American Society of Mechanical Engineers, 1991.

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H, Richards P., ed. Optical measurements in fluid mechanics, 1985: Proceedings of the VI International Conference on Photon Correlation and other Techniques in Fluid Mechanics, held in Churchill College, Cambridge, 10-12 July 1985. Bristol: A. Hilger, 1985.

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Fluid, Measurements and Instrumentation Forum (1993 Washington D. C. ). Fluid Measurement and Instrumentation Forum, 1993: Presented at the Fluids Engineering Conference, Washington, D.C., June 20-24, 1993. New York, N.Y: American Society of Mechanical Engineers, 1993.

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Book chapters on the topic "Congresses. Fluid dynamic measurements"

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Leehey, Patrick. "Dynamic Wall Pressure Measurements." In Advances in Fluid Mechanics Measurements, 201–27. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-83787-6_5.

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Martinez-Botas, Ricardo F. "Mixed-flow Turbine: Steady and Unsteady Performance with Detailed Flow Measurements." In Thermo- and Fluid-dynamic Processes in Diesel Engines, 211–35. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-04925-9_12.

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Burkhardt, O., U. G. S. Dinata, and W. Nitsche. "Surface Fence with an Integrated, Piezoresistive Pressure Sensor for Measurements of Static and Dynamic Wall Shear Stress." In New Results in Numerical and Experimental Fluid Mechanics III, 411–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-540-45466-3_48.

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Barklage, Alexander, and Rolf Radespiel. "Interaction of Wake and Propulsive Jet Flow of a Generic Space Launcher." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 129–43. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_8.

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Abstract This work investigates the interaction of the afterbody flow with the propulsive jet flow on a generic space launcher equipped with two alternative nozzle concepts and different afterbody geometries. The flow phenomena are characterized by experimental measurements and numerical URANS and LES simulations. Investigations concern a configuration with a conventional truncated ideal contour nozzle and a configuration with an unconventional dual-bell nozzle. In order to attenuate the dynamic loads on the nozzle fairing, passive flow control devices at the base of the launcher main body are investigated on the configuration with TIC nozzle. The nozzle Reynolds number and the afterbody geometry are varied for the configuration with dual-bell nozzle. The results for integrated nozzles show a shift of the nozzle pressure ratio for transition from sea-level to altitude mode to significant lower levels. The afterbody geometry is varied including a reattaching and non-reattaching outer flow on the nozzle fairing. Investigations are performed at supersonic outer flow conditions with a Mach number of $$Ma_\infty =3$$. It turns out, that a reattachment of the outer flow on the nozzle fairing leads to an unstable nozzle operation.
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Brock, Fred V., and Scott J. Richardson. "Barometry." In Meteorological Measurement Systems. Oxford University Press, 2001. http://dx.doi.org/10.1093/oso/9780195134513.003.0004.

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The objective of barometry is to measure the static pressure exerted by the atmosphere. Static pressure is the force per unit area that would be exerted against any surface in the absence of air motion. It is an isotropic, scalar quantity. Dynamic pressure is the force per unit area due to air motion. It is a vector quantity, following the wind vector. This chapter is concerned with determining the static air pressure and doing so in the presence of air motion (wind) that requires special measurement techniques. The Earth’s atmosphere exerts a pressure on the surface of the Earth equal to the weight of a vertical column of air of unit cross-section. Since air is a fluid, this pressure, or force, is exerted equally in all directions. The static pressure at the surface is given by where g(z) = acceleration due to gravity at height z above sea level in ms-2, and ρ = density as a function of height, kg-3. The SI unit of pressure is the pascal, abbreviated as Pa. In meteorology, the preferred unit of pressure is the mb or the hPa (equivalent magnitude). Table 2-1 lists some conversion factors for units currently in use in pressure measurement and also for some units no longer favored. Standard sea level pressure in various units is shown in table 2-2. The last line of table 2-2 refers to the units of Ibf in-2,also called psi (pounds per square inch). Pressure measurements are often called absolute (psia), gauge (psig), or differential (psid). Absolute pressure is simply the total static pressure exerted by the gas (or fluid) and so the barometric pressure is also the absolute pressure. Gauge pressure is the pressure relative to ambient atmospheric pressure. Pressure in an automobile tire is measured relative to atmospheric pressure so it is gauge pressure, not absolute pressure. Differential pressure is the pressure relative to some other pressure. Gauge pressure is a special case of differential pressure. In addition to the static pressure there is a dynamic pressure exerted by wind flow.
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Conference papers on the topic "Congresses. Fluid dynamic measurements"

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Tindell, R. H. "Computational Fluid Dynamic Applications for Jet Propulsion System Integration." In ASME 1990 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1990. http://dx.doi.org/10.1115/90-gt-343.

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The impact of computational fluid dynamics (CFD) methods on the development of advanced aerospace vehicles is growing stronger year by year. Design engineers are now becoming familiar with CFD tools and are developing productive methods and techniques for their applications. This paper presents and discusses applications of CFD methods used at Grumman to design and predict the performance of propulsion system elements such as inlets and nozzles. The paper demonstrates techniques for applying various CFD codes and shows several interesting and unique results. A novel application of a supersonic Euler analysis of an inlet approach flow field, to clarify a wind tunnel-to-flight data conflict, is presented. In another example, calculations and measurements of low-speed inlet performance at angle of attack are compared. This is highlighted by employing a simplistic and low-cost computational model. More complex inlet flow phenomena at high angles of attack, calculated using an approach that combines a panel method with a Navier-Stokes (N-S) code, is also reviewed. The inlet fluid mechanics picture is rounded out by describing an N-S calculation and a comparison with test data of an offset diffuser having massively separated flow on one wall. Finally, the propulsion integration picture is completed by a discussion of the results of nozzle-afterbody calculations, using both a complete aircraft simulation in a N-S code, and a more economical calculation using an equivalent body of revolution technique.
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Bently, Donald E., Charles T. Hatch, and Wesley D. Franklin. "Cautions for Polar-Plot Balancing Using Measurements Taken Near Fluid-Lubricated Bearings." In ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1994. http://dx.doi.org/10.1115/94-gt-113.

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The influence of fluid dynamic forces in a fluid-lubricated bearing on the imbalance response of a flexible rotor is examined with respect to effects on polar-plot balancing. The results of an experiment clearly demonstrate a journal phase lag at the center of the bearing which approaches 90° relative to the response of a mid-span massive disk over a range of rotor speeds from well below to well above the first lateral bending mode natural frequency of the rotor. The experimental phase lag is nearly constant over the entire range of rotor speeds. The results of this experiment are found to be in good agreement with results from both an analytical 2-degree-of-freedom model and a finite element analysis. The analytical model reveals that the severity of the phase lag effect is related to the ratio of the Quadrature Dynamic and Direct Dynamic stiffnesses acting at the journal. Calibration-weight balancing is found to be unaffected by the phase lag problem. The authors conclude that, - unless this phase lag is taken into account, polar-plot balancing may be difficult when vibration data from a relatively flexible rotor are obtained very close to a fluid-lubricated bearing.
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Jokar, Amir. "Integration of Computational Fluid Dynamics and Experimentation in Undergraduate Fluid Mechanics." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15256.

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A combination of computational and experimental analyses with the conventional lectures and problem-solving in a fundamental course such as fluid mechanics can enhance students' learning enormously. This teaching model has been examined within the mechanical engineering curriculum at WSU Vancouver, and successful results have been obtained thus far. The goal in this course was first to seed concepts and theorems of fluid mechanics in general terms, followed by numerical solutions and hands-on experimentation on selective subjects. This would allow the students to gain a deep understanding of the contents within the course timeframe. For selective fluid problems with more complications, such as the flow in the entrance region of a pipe, a computational fluid dynamic (CFD) software known as FlowLab was used to obtain numerical solutions. The assigned computational projects could open the eyes of students to the world of CFD analysis in thermal/fluid systems design. The results of the numerical analysis were then compared to the theoretical and experimental results. For experimentation, the students were divided into groups to design experimental procedures, conduct experiments, collect and interpret data, and report the results in an appropriate format. The selective experiments were relevant to the course topics including Burdon pressure gauges, manometers, flow-rate measurements, pipe flow, and flow around immersed bodies in a water tunnel. The present study addresses the details, results, and advantages of such a multi-dimensional and more interactive learning model.
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Zeng, Jie, Liqiong Zhang, Larry Deaton, Emile Damisse, Jodie Hansing, and Chandra Pathak. "Flow Rating Improvement for Culverts and Spillways Using Hybrid of Field Flow Measurements and Computational Fluid Dynamic Simulations." In World Environmental and Water Resources Congress 2011. Reston, VA: American Society of Civil Engineers, 2011. http://dx.doi.org/10.1061/41173(414)224.

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Vance, John M., and Daniel Ying. "Experimental Measurements of Actively Controlled Bearing Damping With an Electrorheological Fluid." In ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-017.

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Selection criteria and design evaluations of several types of bearing dampers with active control for application to aircraft engines were described in a companion paper (Vance, Ying, and Nikolajsen, 1999). A disk type electrorheological (ER) damper was chosen for further study and testing. The results of the tests and the final conclusions of the study are described in this paper. Experimental results including stiffness and damping coefficients are presented for the ER bearing damper with two types of ER fluid, 350 CS and 10 CS (centistokes) viscosity. The vibration attenuation performance of the ER damper was measured on a rotordynamic test rig in the form of free vibration decay, rotor orbits, and runup unbalance responses. The results show that the ER fluid with lower viscosity has the better characteristics for rotordynamic applications. It was found that ER fluids produce both Coulomb and viscous damping. If only the damping is considered, the Coulomb type is less desirable, but with active control it can also achieve control of rotor stiffness as analyzed in Vance and San Andres (1999). A feedback control system was developed and applied to the ER damper with the objective of improving the overall rotordynamic performance of the rotor bearing system, considering both vibration amplitudes and dynamic bearing forces. A “bang-bang” (on and off) simple control logic was found to work better in practice than more sophisticated schemes. The measured runup responses of the rotor-bearing system with this control approximated the desired vibration response curves fairly well. The tests highlighted some of the practical considerations that would be important for aircraft engine applications, such as the ER fluid limitations, the electrical power supply requirements, the electrical insulation requirements, the nonlinear relationship between the voltage and the damping, and the relative benefits of active control. It is concluded that active control of bearing damping is probably not a practical improvement over the passive squeeze film dampers currently used in most aircraft gas turbine engines.
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Boyd, Lewis J., Andrew P. Roberts, Andrew P. S. Collett, D. Nigel Johnston, Derek G. Tilley, and Kevin A. Edge. "Prediction of Hydraulic Inertance Using Acoustic Measurements and CFD Modeling." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14272.

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Fluid inertia within passageways of hydraulic components is known to have a significant impact on their dynamic response and fluid-borne noise characteristics. This inertance is often hard to quantify either theoretically or experimentally due to the complex nature of component geometries, and because it is related to dynamic, not steady-state behaviour. Previous studies have used the secondary source method to determine the impedance, of which the inertance is an important parameter, of components such as positive displacement pumps and valves. A simple acoustic test for predicting the inertance of a component is proposed. The component must have a direct connection between inlet and outlet, and as such is directly applicable to valves and accumulators. Results were compared to theory for known components, including uniform pipes, and with predictions made using the commercial computational fluid dynamics (CFD) package ANSYS CFX, using the analogy of steady state flow through a porous passageway of identical geometry. In general, good agreement between acoustic measurements and CFD predictions was obtained for a number of ball valves, gate valves and an accumulator poppet valve.
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Kassab, Asmaa Sadek, Victor M. Ugaz, Maria D. King, and Yassin A. Hassan. "Dynamic Measurements of Micro-Meter Particle Detachment on Glass Surfaces." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-87786.

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This work presents a high resolution study of the condition under which a transient fluid flow causes spherical glass beads particles of 10–100 μm in size to detach from glass surfaces. The general approach is to conduct well-controlled experiments, to observe individual microparticle motion in short term resuspension, within a period up to 5s, and to focus on the basic detachment mechanisms of the resuspended particles to fully understand and quantify the behavior of particles immediately before liftoff. Particle tracking obtained from high-speed imaging of individual particle with 4000 frames/s, reveal three different types of motion: rolling/bouncing, immediate liftoff (where the particle showed immediate liftoff without any initial rolling/bouncing) and complex motion where particles travel with rolling/bouncing motion on the surface for a certain distance before liftoff. The longer it will take the particle to start its initial movement the more rapid is the liftoff once motion is initiated. The majority of particle trajectories from the glass substrate were parallel to the surface with complex motion, covering 25% of the total distance traveled in rolling/bouncing motion before liftoff. Additionally, Single layer detachment showed that the detachment percentage initially follow an exponentially increasing trend for a period of ∼ 1s, followed by a plateau phase for a period of 5s.
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Martelli, Francesca, Massimo Milani, Luca Montorsi, Guido Ligabue, and Pietro Torricelli. "Fluid-Structure Interaction of Blood Flow in Human Aorta Under Dynamic Conditions: A Numerical Approach." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87793.

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The paper proposes a numerical approach for the analysis of the blood flow in human aorta under real operating conditions. An ad-hoc procedure is developed for importing the aorta geometry from magnetic resonance imaging in order to have a patient based analysis. The aortic flow is simulated accounting for the dynamic behavior of the flow resulting from the heart pulse and for the non-Newtonian properties of blood. Fluid – structure analysis is carried out to address the mutual influence of the flow transient nature and the aorta walls’ deformation on the pressure flow field and tissue’s stresses. Finite element method approach is used for the structural analysis of the aorta walls which are assumed as a linear elastic isotropic material; nevertheless, different regions are introduced to account for the Young modulus variation from the ascending aorta to the common iliac arteries. Mesh morphing techniques are adopted to simulate the wall deformation and a two equation turbulence model is adopted to include the turbulence effects. The proposed numerical approach is validated against the measurements carried out on magnetic resonance imaging scanner and a good agreement is found in terms of aorta wall maximum and minimum deformation during the cardiac cycle. Therefore, the fluid-structure analysis can provide an important tool to extend the insight of the aortic system from magnetic resonance imaging techniques and improve the understanding of arteriosclerosis and the related phenomena as well as their dependence on flow structure and tissue stresses.
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Platte, Thomas. "Development of a Primary Dynamic Calibration Method for Pressure Sensors." In 19th International Congress of Metrology (CIM2019), edited by Sandrine Gazal. Les Ulis, France: EDP Sciences, 2019. http://dx.doi.org/10.1051/metrology/201927006.

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An increasing research activity in the field of dynamic calibration of pressure transducers can be recognized at some national metrology institutes. As an example the EMPIR project “development of measurement and calibration techniques for dynamic pressures and temperatures” can be named. Despite that efforts, no national reference standard for dynamic pressure calibration is available up to now. This makes the measurement of high fluctuating pressure signals difficult and unprecise. These dynamic pressure signals appears in aerospace applications, blast test and almost every fluidic circuit which employs discontinuous discharge elements. To address that topic the authors developed a sine calibration apparatus to measure the frequency response of pressure transducers with sufficient amplitudes up to 1.2 MPa. Due to the construction of the pressure generator frequencies up to 10 kHz can be reached. Furthermore a calibration technique was developed to calculate the pressure inside a chamber primarily. The fundamental idea is to calculate the pressure based on the displacement of a piston in a pistonphone device. To do so the author had to analyses the thermodynamic conditions inside the fluid filled chamber. The paper shows that the fundamental approach was confirmed by measurements.
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Kanda, Kensuke, and Ming Yang. "Measurements of Surface Effects on Bio-Fluids Flow in Micro-Channel by Using SPM." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59004.

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For the establishment of the design methodologies of micro fluidic chips, the essential analysis of the flow behavior on the micro-meter scale and surface interactions on the nano-scale has been investigated. The understanding of bio-fluid flow behavior in the micro-systems includes both the basic fluid dynamic problems and driving forces from the fields of application. Attention has been focused on the clarification of the surface effects on the solution of bio-molecular flow at micro-scale dimensions. Investigations of pressure drop measurements in bio-molecular flow together with measurements of biomolecular absorption and the lateral forces on various surfaces were carried out on both micro and nano scale. The results demonstrated a clear correlation between flow drag and bio molecular interaction with the surface. The validity is demonstrated of the evaluation method suggested in this paper.
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Reports on the topic "Congresses. Fluid dynamic measurements"

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Liu, D., and T. de Bruin. New technology for fluid dynamic measurements in gas-liquid-solid three-phase flow reactors. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/304508.

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Marboe, R. C., A. A. Fontaine, and T. Cawley. Instrumentation and Equipment Upgrades to Improve Acoustical and Fluid Dynamic Measurements in the Garfield Thomas Water Tunnel. Fort Belvoir, VA: Defense Technical Information Center, October 2003. http://dx.doi.org/10.21236/ada418897.

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