Relevant bibliographies by topics / Pulsed flow

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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 'Pulsed flow'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 March 2023

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Journal articles on the topic "Pulsed flow"

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Ho, Viet Luan, Robert M. Dorrell, Gareth M. Keevil, Robert E. Thomas, Alan D. Burns, Jaco H. Baas, and William D. McCaffrey. "Dynamics and deposition of sediment-bearing multi-pulsed flows and geological implication." Journal of Sedimentary Research 89, no. 11 (November 26, 2019): 1127–39. http://dx.doi.org/10.2110/jsr.2019.62.

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ABSTRACT Previous studies on dilute, multi-pulsed, subaqueous saline flows have demonstrated that pulses will inevitably advect forwards to merge with the flow front. On the assumption that pulse merging occurs in natural-scale turbidity currents, it was suggested that multi-pulsed turbidites that display vertical cycles of coarsening and fining would transition laterally to single-pulsed, normally graded turbidites beyond the point of pulse merging. In this study, experiments of dilute, single- and multi-pulsed sediment-bearing flows (turbidity currents) are conducted to test the linkages between downstream flow evolution and associated deposit structure. Experimental data confirm that pulse merging occurs in laboratory-scale turbidity currents. However, only a weak correspondence was seen between longitudinal variations in the internal flow dynamics and the vertical structure of deposits; multi-pulsed deposits were documented, but transitioned to single-pulsed deposits before the pulse merging point. This early transition is attributed to rapid sedimentation-related depletion of the coarser-grained suspended fraction in the laboratory setting, whose absence may have prevented the distal development of multi-pulsed deposits; this factor complicates estimation of the transition point in natural-scale turbidite systems.
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Zhao, Zi-Jie, Y. D. Cui, Jiun-Ming Li, Jian-Guo Zheng, and B. C. Khoo. "On the boundary flow using pulsed nanosecond DBD plasma actuators." Modern Physics Letters B 32, no. 12n13 (May 10, 2018): 1840035. http://dx.doi.org/10.1142/s0217984918400353.

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Our previous studies in quiescent air environment [Z. J. Zhao et al., AIAA J. 53(5) (2015) 1336; J. G. Zheng et al., Phys. Fluids 26(3) (2014) 036102] reveal experimentally and numerically that the shock wave generated by the nanosecond pulsed plasma is fundamentally a microblast wave. The shock-induced burst perturbations (overpressure and induced velocity) are found to be restricted to a very narrow region (about 1 mm) behind the shock front and last only for a few microseconds. These results indicate that the pulsed nanosecond dielectric barrier discharge (DBD) plasma actuator has stronger local effects in time and spatial domain. In this paper, we further investigate the effects of pulsed plasma on the boundary layer flow over a flat plate. The present investigation reveals that the nanosecond pulsed plasma actuator generates intense perturbations and tends to promote the laminar boundary over a flat plate to turbulent flow. The heat effect after the pulsed plasma discharge was observed in the external flow, lasting a few milliseconds for a single pulse and reaching a quasi-stable state for multi-pulses.
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Krueger, Paul S., Ali A. Moslemi, J. Tyler Nichols, Ian K. Bartol, and William J. Stewart. "Vortex Rings in Bio-Inspired and Biological Jet Propulsion." Advances in Science and Technology 58 (September 2008): 237–46. http://dx.doi.org/10.4028/www.scientific.net/ast.58.237.

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Pulsed-jets are commonly used for aquatic propulsion, such as squid and jellyfish locomotion. The sudden ejection of a jet with each pulse engenders the formation of a vortex ring through the roll-up of the jet shear layer. If the pulse is too long, the vortex ring will stop forming and the remainder of the pulse is ejected as a trailing jet. Recent results from mechanical pulsedjets have demonstrated that vortex rings lead to thrust augmentation through the acceleration of additional ambient fluid. This benefit is most pronounced for short pulses without trailing jets. Simulating vehicle motion by introducing background co-flow surrounding the jet has shown that vortex ring formation can be interrupted, but only if the co-flow is sufficiently fast. Recent in situ measurements on squid have captured vortical flows similar to those observed in the laboratory, suggesting thrust augmentation may play a role in their swimming performance. Likewise, recent measurements with a mechanical self-propelled pulsed-jet vehicle (“robosquid”) have shown a cruise-speed advantage obtained by pulsing.
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Su, Zhi, Haohua Zong, Hua Liang, Jun Li, and Xiancong Chen. "Characteristics of a dielectric barrier discharge plasma actuator driven by pulsed-DC high voltage." Journal of Physics D: Applied Physics 55, no. 7 (November 12, 2021): 075203. http://dx.doi.org/10.1088/1361-6463/ac30bc.

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Abstract Dielectric barrier discharge using pulsed-DC high voltage (pulsed-DC DBD) have been proven to be capable of effectively reducing skin friction drag in turbulent boundary layers with limited power consumption, thus producing significant net power savings. In this work, the characteristics of pulsed-DC DBD, including power consumption, induced flow structure, thermal effect, and body force, are investigated sequentially. Both the power consumption and pressure waves produced by pulsed-DC DBD are similar to that of DBD using nanosecond pulses (ns-DBD), whereas the wall-bounded jet structure resembles that of DBD using sinusoidal high voltage (ac-DBD). A curved wall jet is induced at a small pulse width, which turns into a straight one due to the combined effect of momentum and thermal addition when the pulse width increases. With increasing pulse width, the induced body force goes up while the thermal effect weakens. Although pulse frequency has no impact on the wall-bounded jet topology, the body force increases with pulse frequency because of the enhanced energy entrainment. With these results, four parameters that affect the performance of pulsed-DC DBD are extracted, including the pulse leading edge, pulse width, frequency, and amplitude, which lays the foundation for the optimization of pulsed-DC DBD.
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Pakhomov, M. A., and V. I. Terekhov. "RANS Simulation of the Effect of Pulse Form on Fluid Flow and Convective Heat Transfer in an Intermittent Round Jet Impingement." Energies 13, no. 15 (August 4, 2020): 4025. http://dx.doi.org/10.3390/en13154025.

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The of effect pulse form (rectangular, sinusoidal and triangular) on the fluid flow and heat transfer of an intermittent jet impingement was studied numerically. It was shown in a non-steady-state jet, both an increase and decrease in heat transfer are possible compared with steady-state jet for all investigated pulse forms. For small distances between the pipe edge and obstacle (H/D ≤ 6) in the pulsed jet, heat transfer around the stagnation point increases with increasing pulse frequency, while for H/D > 8 an increase in frequency causes a heat transfer decrease. A growth in the Reynolds number causes a decrease in heat transfer, and data for all frequencies approach the steady-state flow regime. The numerical model is compared with the experimental results. Satisfactory agreement on the influence of the form and frequency of pulses on heat transfer for the pulsed jet on the obstacle surface is obtained.
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Pratomo, Hariyo P. S., and Klaus Bremhorst. "Velocity Statistics of a Fully Pulsed Round Jet in Streamwise Direction." Applied Mechanics and Materials 534 (February 2014): 117–23. http://dx.doi.org/10.4028/www.scientific.net/amm.534.117.

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In this paper, statistical quantities of a fully pulsed round jet along the jet centerline are reported. A range of the Reynolds (1.5 x 104 < Re < 4 x 104) and Strouhal (0.0064 < St < 0.0076) numbers is used to generate the jet. Physically this unsteady jet produces a series of distinct pulses due to the excitations. The mechanically excitations lead to the appearance of pulse dominated and high turbulence steady jet region in which their existence is of a strong dependence on the level of the controlled parameters. After the pulse merging completes the pulsed jet alters to a self-preserving steady jet with a significantly higher turbulence intensity. Under a constant mass flow rate the pulsed jet tends to be more fluctuating at a less intense pulsation thus permitting the endurance of the normalized periodic component and a more rapid velocity decay in the pulse-dominated region.
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Zhao, Heqian, Huaizhong Shi, Zhongwei Huang, Zhenliang Chen, Ziang Gu, and Fei Gao. "Mechanism of Cuttings Removing at the Bottom Hole by Pulsed Jet." Energies 15, no. 9 (May 3, 2022): 3329. http://dx.doi.org/10.3390/en15093329.

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Vibration drilling technology induced by hydraulic pulse can assist the bit in breaking rock at deep formation. Simultaneously, the pulsed jet generated by the hydraulic pulse promotes removal of the cuttings from the bottom hole. Nowadays, the cuttings removal mechanism of the pulsed jet is not clear, which causes cuttings to accumulate at the bottom hole and increases the risk of repeated cutting. In this paper, a pressure-flow rate fluctuation model is established to analyze the fluctuation characteristics of the pulsed jet at the bottom hole. Based on the model, the effects of displacement, well depth, drilling fluid viscosity, and flow area of the pulsed jet tool on the feature of instantaneous flow at the bottom hole are discussed. The results show that the pulsed jet causes flow rate and pressure to fluctuate at the bottom hole. When the displacement changes from 20 L/s to 40 L/s in a 2000 m well, the pulsed jet generates a flow rate fluctuation of 4–9 L/s and pressure fluctuation of 0.1–0.5 MPa at the bottom hole. With the flow area of the tool increasing from 2 cm2 to 4 cm2, the amplitude of flow rate fluctuation decreases by 72.5%, and the amplitude of pressure fluctuation decreases by more than 60%. Combined with the fluctuation feature of the flow field and the water jet attenuation law at the bottom hole, the force acting on the cuttings under the pulsed jet is derived. It is found that flow rate fluctuation improves the mechanical state of cuttings and is beneficial for cuttings tumbled off the bottom hole. This research provides theoretical guidance for pulsed jet cuttings cleaning at the bottom hole.
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Heath, Martha E., and Susan Bleck GIBBS. "High-voltage pulsed galvanic stimulation: effects of frequency of current on blood flow in the human calf muscle." Clinical Science 82, no. 6 (June 1, 1992): 607–13. http://dx.doi.org/10.1042/cs0820607.

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1. Twelve healthy subjects received high-voltage pulsed galvanic stimulation (115–475V d.c.) delivered in separate treatments of 2, 32 and 128 pulses/s for 10 min at the subject's maximum tolerable voltage while calf muscle blood flow was measured by non-invasive Whitney strain-gauge venous occlusion plethysmography. 2. The high-voltage pulsed galvanic stimulation was administered with negative polarity by an intermittent mode of 30 s on, 30 s off. Measurements of calf muscle blood flow were made during each 30 s period when the stimulus was off. The effect of one 30 s maximum isometric contraction of the calf muscles on blood flow was used as a standard for evaluating the effectiveness of high-voltage pulsed galvanic stimulation on calf muscle blood flow. 3. Significant (paired t-tests; P < 0.05) increases in calf muscle blood flow over the preceding baseline levels occurred for the isometric contraction (322%) and for frequencies of 2 pulses/s (33.5%) and 128 pulses/s (13.36%), but not for a frequency of 32 pulses at which calf muscle blood flow increased in only six of 12 subjects. The mean increases in calf muscle blood flow at 2 and 128 pulses/s represented 11.63% and 4.0%, respectively, of that resulting from the isometric contraction. 4. A clear positive correlation between voltage level and the magnitude of increase in calf muscle blood flow was demonstrated but differed for each frequency used. 5. It is concluded that high-voltage pulsed galvanic stimulation results in a measurable increase in calf muscle blood flow when it is applied at frequencies of 2 or 128 pulses/s on intermittent mode and at maximum tolerable voltages, but the magnitude of the increase in blood flow is small compared with that stimulated by a maximal isometric contraction.
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Stessel, Richard Ian. "Controlling Pulsed Incompressible Flow." Journal of Energy Engineering 118, no. 1 (April 1992): 1–17. http://dx.doi.org/10.1061/(asce)0733-9402(1992)118:1(1).

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Legallais, C., Ph Morinière, A. Fournier, and M. Y. Jaffrin. "PULSED FLOW CASCADE FILTRATION." ASAIO Journal 42, no. 2 (March 1996): 1. http://dx.doi.org/10.1097/00002480-199603000-00003.

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Dissertations / Theses on the topic "Pulsed flow"

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Kumar, Pankaj. "Chaos in Pulsed Laminar Flow." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/39260.

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Fluid mixing is a challenging problem in laminar flow systems. Chaotic advection can play an important role in enhancing mixing in such flow. In this thesis, different approaches are used to enhance fluid mixing in two laminar flow systems. In the first system, chaos is generated in a flow between two closely spaced parallel circular plates by pulsed operation of fluid extraction and reinjection through singularities in the domain. A singularity through which fluid is injected (or extracted) is called a source (or a sink). In a bounded domain, one source and one sink with equal strength operate together as a source-sink pair to conserve the fluid volume. Fluid flow between two closely spaced parallel plates is modeled as Hele-Shaw flow with the depth averaged velocity proportional to the gradient of the pressure. So, with the depth-averaged velocity, the flow between the parallel plates can effectively be modeled as two-dimensional potential flow. This thesis discusses pulsed source-sink systems with two source-sink pairs operating alternately to generate zig-zag trajectories of fluid particles in the domain. For reinjection purpose, fluid extracted through a sink-type singularity can either be relocated to a source-type one, or the same sink-type singularity can be activated as a source to reinject it without relocation. Relocation of fluid can be accomplished using either â first out first inâ or â last out first inâ scheme. Both relocation methods add delay to the pulse time of the system. This thesis analyzes mixing in pulsed source-sink systems both with and without fluid relocation. It is shown that a pulsed source-sink system with â first out first inâ scheme generates comparatively complex fluid flow than pulsed source-sink systems with â last out first inâ scheme. It is also shown that a pulsed source-sink system without fluid relocation can generate complex fluid flow. In the second system, mixing and transport is analyzed in a two-dimensional Stokes flow system. Appropriate periodic motions of three rods or periodic points in a two-dimensional flow are determined using the Thurston-Nielsen Classification Theorem (TNCT), which also predicts a lower bound on the complexity generated in the fluid flow. This thesis extends the TNCT -based framework by demonstrating that, in a perturbed system with no lower order fixed points, almost invariant sets are natural objects on which to apply the TNCT. In addition, a method is presented to compute line stretching by tracking appropriate motion of finite size rods. This method accounts for the effect of the rod size in computing the complexity generated in the fluid flow. The last section verifies the existence of almost invariant sets in a two-dimensional flow at finite Reynolds number. The almost invariant set structures move with appropriate periodic motion validating the application of the TNCT to predict a lower bound on the complexity generated in the fluid flow.
Ph. D.
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Finnigan, Sean Matthew. "Pulsed flow ultrafiltration in baffled tubular membranes." Thesis, University of Bath, 1990. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254875.

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Weeks, Colin. "Pulsed-flow microreactor studies of propene (Amm)oxidation." Thesis, University of Reading, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266799.

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McCarthy, Larry K. "Steady Flow and Pulsed Performance Trends of High Concentration DMFCs." Thesis, Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10434.

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Direct Methanol Fuel Cells (DMFCs) are a promising source of energy due to their potentially high energy density, facilitated fuel delivery and storage, and precluded fuel processing. However, DMFCs have several challenges which need to be resolved before they can replace existing energy sources. Some of the challenges include lower power density, relatively high cost, and uncertain reliability. These issues are all promoted, at least in part, by the methanol crossover phenomenon, wherein membrane permeability allows the undesirable species transport of methanol from anode to cathode. This phenomenon also causes the requirement of dilute fuel mixtures, which is undesirable from an energy density viewpoint. Steady flow polarization curves were first analyzed at various concentrations. An optimal concentration range was found wherein both methanol crossover and concentration losses were effectively minimized. During the study of transient phenomena, the fuel was first temporarily discontinued. It was found that a significant cell potential enhancement occurred due to anodic fuel concentration reduction and thus depleting the reactant crossover. The percentage voltage increase was considerably greater at higher concentrations. Based on the fuel discontinuation, a hydraulic pulsing operation was developed and tested. During some of these continuous pulsing schemes, fuel discontinuation did not result in an instantaneous cell potential enhancement mainly due to the internal inertia of the membrane. Nonetheless, a significant cell potential and fuel efficiency enhancement was observed. In addition, the pulse of both fuel and current density resulted in a significant power density increase.
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Castera, Philippe. "Energy coupling mechanisms in pulsed surface discharges for flow control." Thesis, Châtenay-Malabry, Ecole centrale de Paris, 2015. http://www.theses.fr/2015ECAP0041/document.

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Ce travail s'intéresse aux effets mécaniques créés par les décharges de surface et à leur efficacité comme actionneur. Une géométrie particulière d'électrodes permet de créer de manière pulsée un filament linéaire de plasma et de le chauffer très rapidement par effet Joule (à raison de plusieurs Joules en moins d'une microseconde). Ce chauffage rapide entraîne la formation d'ondes de choc qui peuvent interagir avec l'écoulement ambiant.Nous étudions le comportement électrique de la décharge de surface afin d'évaluer l'énergie déposée dans le filament de plasma par effet Joule. Pour ce faire, nous réalisons une étude paramétrique sur la configuration du circuit et nous déterminons les principaux paramètres qui pilotent la dynamique de la décharge. Différents modèles de résistance sont utilisés dans un code de simulation du circuit électrique, et leurs prédictions du courant et du dépôt d'énergie sont confrontées aux mesures expérimentales.Des mesures spectroscopiques dans différentes configurations de circuit donnent accès à certaines propriétés de la décharge comme la densité électronique, qui atteint des valeurs de 2x1018 cm-3. Le rayon du canal est également mesuré par imagerie rapide. Les ondes de chocs créées par la décharge de surface sont visualisées en imagerie Schlieren pour plusieurs configurations de circuit. Ces ondes de chocs créent une impulsion proportionnelle à l'énergie déposée dans la décharge. Nos développons un modèle de choc pour décrire la trajectoire du choc et pour calculer l'impulsion communiquée par la décharge de surface. Le modèle est en bon accord avec les mesures expérimentales et la décharge de surface a une efficacité mécanique de 0.12mNs/J pour notre configuration d'étude. Nous terminons cette étude en comparant cet actionneur potentiel avec d'autres actionneurs courants et proposons plusieurs pistes pour de futurs travaux
In this study, we investigate the mechanical effects generated by pulsed surface discharges and their efficiency as an actuator. Using a specific electrode configuration, it is possible to create a short-lived, pulsed, rectilinear plasma channel and to heat it up rapidly (several Joules in less than a microsecond) through Joule heating. This fast energy deposition causes the formation of shock waves that can then interact with the surrounding flow.We study the electrical behavior of the pulsed surface discharge to assess the energy deposited in the plasma channel through Joule heating. To do so, we perform a parametric study on the circuit configuration and identify the main parameters driving the discharge dynamics. Several resistance models are implemented in a numerical description of the electrical circuit and their predictions of the current and deposited energy are compared with experimental measurements.Spectroscopic measurements in different circuit configurations give access to some of the plasma properties such as the electron number density that can reach values up to 2x1018 cm-3. Fast imaging also gives insight into the plasma channel radius. The shock waves generated by the pulsed surface discharge in different circuit configurations are visualized through Schlieren imaging. These shock waves generate an impulse that increases linearly with the energy deposited in the discharge. We develop a shock model to describe the shock trajectory and to compute the impulse imparted by the pulsed surface discharge. The model is in good agreement with our measurements and the pulsed surface discharge is found to have a mechanical efficiency of 0.12 mNs/J for our setup configuration. We conclude this study by comparing the proposed pulsed surface discharge actuator with other common designs and offer some directions for future studies
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Nishihara, Munetake. "Low-temperature supersonic flow control using repetitively pulsed MHD force." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1164748794.

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Baluti, Silviu Ioan. "Experimental characterization of flow dynamics of pulsed-chemical vapour deposition." Thesis, University of Canterbury. Mechanical Engineering, 2005. http://hdl.handle.net/10092/6593.

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This research is a study of the precursor mass transport, the first variable that affects the film deposition rate, uniformity, coverage, and microstructure of resulted films on substrates inside Chemical Vapour Deposition (CVD) reactors. The Pulsed-CVD reactant flow field uniformities in pulse flow were compared to equivalent steady flow regimes. For mass limited transport CVD processes this represents an important matter, as precursor flux increase leads directly to increased deposition rates. The objective of the research was to develop design relations and define operational parameter ranges to achieve flow field uniformity through experimental investigations. Metered gaseous N2 reactant quantities were injected at equal time intervals into the continuously evacuated reactor. The resulting reactor pressure cycle crosses all the three pressure flow regimes, from viscous, to transition and finally to molecular flow. Nondimensional flow parameters for this unique pulse pressure flow regime were developed from first principles and were studied for relation to design and operation of Pulsed-CVD equipment and processes. Because of the reactor low pressures and non-steady conditions, temperature induced buoyancy driven flows have low effect on the flow field dynamics of the gaseous N2 flow (low Grashof number). Thus this research into pulsed pressure flow field uniformity was conducted for isothermal reactor conditions, without the heater powered. For the reactor flow field uniformity determination, the naphthalene sublimation technique has been employed. This method is usually employed in viscous flow for the determination of the convective heat transfer coefficient through the heat and mass transfer analogy. In this research a method was developed to use the sublimation rate of several samples placed at different locations in the reactor volume to measure the relative convective and pressure conditions, and thus the uniformity of the reactor flow field. xvii Experiments have been run by subsequently varying the pulsing cycle length, the reactor pressure (implicitly the injected reactant mass), and the deposition substrate geometry. The rest of the deposition variables have been kept constant. The experimental results show that cycle time greater than or equal to four times the reactor molecular time constant lead to best pulse flow uniformities, and that for these cycle times the 3D flow field uniformities in pulse flow regimes are always better than in equivalent steady flow ones. Comparable uniformities in both flows between stacked wafer substrates have been determined, with slightly better uniformities in pulse flow than in equivalent steady flow experiments. In order to determine the steady flow field uniformities inside the experimental reactor, as well as when varying its geometrical characteristics, the gas flow was simulated using the finite volume Computational Fluid Dynamics (CFD) method and the commercial software Fluent 6.1. Design and process parameters are proposed, and the reactor pressure is analytically modelled for the pulse flow regime.
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Xu, Ling An. "Pulsed ultrasound cross correlation flowmeter for two component flow measurement." Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277230.

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Rattray, P. "Pulsed flow and time-resolved dielectric spectroscopy of electrorheological fluids." Thesis, Cranfield University, 1994. http://dspace.lib.cranfield.ac.uk/handle/1826/10508.

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Research has been undertaken into the dielectric and rheological properties of electrorheological (ER) fluids. The fluids studied were based on acene-quinone radical polymers made within the department dispersed in silicone oil. A commercial poly(1ithium methacrylate) dispersion was also examined. As a means of probing the underlying mechanisms of the E phenomenon, the permittivity of the fluids was measured from 12 Hz to 100 kHz under both static and dynamic conditions. Results indicated that a interfacial polarization process was taking place. A series of visual observations were made of fluids under different fielding patterns. A series of photographs were taken that illustrated the structure formation with elapsed time in a dilute fluid. Also photographs were taken of the final structure formed under different field conditions. .. To perform permittivity measurements of the fluid when a electric field was applied, a high voltage biasing unit was designed, built and proved. This allowed the application of a continuous DC electric field of up to 3 kVmm" and the permittivity to be measured from 150 H t 100 kl-Iz. Through a series of experiments it was found that the low frequency permittivity increased with increasing electric field. This result was partially explained by the Sillars model. The fluids were also subjected to shear rates from 1500 to 60 s". Flow modified permittivity resonances were found at the predicted frequencies. However, the resonant frequency did not move significantly under the application of a electric field. The structuring process was time resolved and a model was made to predict the sealing of the characteristic structuring time. The rheological response of the fluids when subjected t pulsed DC fields was examined and found to be dominated by a instrumentational effect. Al experimental procedures are given along with a comprehensive examination of the equipment. The results are discussed as they occur in terms of the models appropriate to that particular event.
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Fernelius, Mark H. "Effect of Full-Annular Pressure Pulses on Axial Turbine Performance." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/3825.

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Pulse detonation engines show potential to increase the efficiency of conventional gas turbine engines if used in place of the steady combustor. However, since the interaction of pressure pulses with the turbine is not yet well understood, a rig was built to compare steady flow with pulsing flow. Compressed air is used in place of combustion gases and pressure pulses are created by rotating a ball valve with a motor. This work accomplishes two main objectives that are different from previous research in this area. First, steady flow through an axial turbine is compared with full annular pulsed flow closely coupled with the turbine. Second, the error in turbine efficiency is approximately half the error of previous research comparing steady and pulsed flow through an axial turbine. The data shows that a turbine driven by full annular pressure pulses has operation curves that are similar in shape to steady state operation curves, but with a decrease in turbine performance that is dependent on pulsing frequency. It is demonstrated that the turbine pressure ratio increases with pulsed flow through the turbine and that this increase is less for higher pulsing frequencies. For 10 Hz operation the turbine pressure ratio increases by 0.14, for 20 Hz it increases by 0.12, and for 40 Hz it increases by 0.06. It is demonstrated that the peak turbine efficiency is lower for pulsed flow when compared with steady flow. The difference between steady and pulsed flow peak efficiency is less severe at higher pulsing frequencies. For 40 Hz operation the turbine efficiency decreases by 5 efficiency points, for 20 Hz it decreases by 9 points, and for 10 Hz it decreases by 11 points. It is demonstrated that the specific power at a given pressure ratio for pulsed flow is lower than that of steady flow and that the decrease in specific power is lower for higher pulsing frequencies. On average, the difference in specific power between steady and pulsed flow is 0.43 kJ/kg for 40 Hz, 1.40 kJ/kg for 20 Hz, and 1.91 kJ/kg for 10 Hz.
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Books on the topic "Pulsed flow"

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Wu, Kaiqiao. Dynamically Structured Flow in Pulsed Fluidised Beds. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-68752-6.

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Ward, Donald T. Flight validation of a pulsed smoke flow visualization system. Edwards, Calif: National Aeronautics and Space Administration, Dryden Flight Research Facility, 1993.

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Ward, Donald T. Flight validation of a pulsed smoke flow visualization system. Edwards, Calif: National Aeronautics and Space Administration, Dryden Flight Research Facility, 1993.

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Ward, Donald T. Flight validation of a pulsed smoke flow visualization system: Final report submitted to the NASA Ames-Dryden Flight Research Facility, Edwards, CA. [Washington, DC: National Aeronautics and Space Administration, 1993.

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Center, NASA Glenn Research, ed. Doppler global velocimetry at NASA Glenn Research Center: System discussion and results. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2003.

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Stanton, Bonita. Physics and technology of high current discharges in dense gas media and flows. Hauppauge, N.Y: Nova Science Publishers, 2009.

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1954-, Mount Jeffrey F., California Energy Commission. Public Interest Energy Research., and University of California, Davis. Center for Watershed Sciences., eds. Pulsed-flow effects on foothill yellow-legged frog (Rana boylii): Integration of empirical, experimental, and hydrodynamic modeling approaches : first-year progress report : PIER interim project report. [Sacramento, Calif.]: California Energy Commission, 2008.

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Lynch, E. D. Analysis of flow processes in the pulse detonation wave engine. Washington, D. C: American Institute of Aeronautics and Astronautics, 1994.

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Krishnan, Radhakrishnan, ed. Computational study of flow establishment in hypersonic pulse facilities. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, Institute for Computational Mechanics in Propulsion, 1995.

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Krishnan, Radhakrishnan, ed. Computational study of flow establishment in hypersonic pulse facilities. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, Institute for Computational Mechanics in Propulsion, 1995.

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Book chapters on the topic "Pulsed flow"

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Baum, E., C. G. Koop, V. A. Kulkerny, K. R. Magiawala, and J. Shwartz. "Density Homogeneity Control in Repetitively Pulsed Gas Lasers." In Gas Flow and Chemical Lasers, 2–14. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-71859-5_1.

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Waichman, K., D. Chuchem, and J. Stricker. "A Supersonic, Pulsed, Chain-Reaction-Pumped HF Laser." In Gas Flow and Chemical Lasers, 193–97. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-71859-5_30.

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Schall, W. O., W. Mayerhofer, and G. Spindler. "Flow Investigations of Pulsed Arc Discharge Recombination Lasers." In Gas Flow and Chemical Lasers, 44–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-71859-5_7.

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Peronneau, P., B. Diebold, J. P. Guglielmi, O. Lanusel, R. Bele, and J. Souquet. "Structure and performances of mono- and bidimensional pulsed Doppler systems." In Color Doppler Flow Imaging, 3–18. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4283-7_1.

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Dufresne, D. "Interaction of High-Energy Pulsed CO2 Laser with Material." In Gas Flow and Chemical Lasers, 348–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-71859-5_52.

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Autric, M., P. Vigliano, D. Dufresne, and Ph Bournot. "Atmospheric Propagation of Pulsed High-Power Laser Beam Increase in Energy Transmission Using a Precursor Pulse." In Gas Flow and Chemical Lasers, 390–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-71859-5_58.

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Wu, Yun, Min Jia, Hua Liang, Huimin Song, and Yinghong Li. "Nanosecond Pulsed Plasma Flow Control: Progress and Problems." In Nonlinear Systems and Complexity, 137–71. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-28764-5_5.

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Kudar, Karen L., and Peter W. Carpenter. "Numerical Investigation of a Micro-Valve Pulsed-Jet Actuator." In IUTAM Symposium on Flow Control and MEMS, 45–51. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6858-4_5.

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Aider, Jean-Luc, Fabien Harambat, Jean-Jacques Lasserre, Jean-Françcois Beaudouin, and Christophe Edouard. "Characterization of MEMS Pulsed Micro-Jets with Large Nozzles." In IUTAM Symposium on Flow Control and MEMS, 53–58. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6858-4_6.

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Stevenson, J. Geoffrey. "Color flow imaging and conventional two- dimensional pulsed Doppler echocardiography: selected observations and experience." In Color Doppler Flow Imaging, 83–105. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4283-7_7.

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Conference papers on the topic "Pulsed flow"

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Yagle, Patrick, Daniel Miller, Erich Bender, Brian Smith, and Peter Vermeulen. "A Computational Investigation of Pulsed Ejection (Invited)." In 1st Flow Control Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-3278.

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Crittenden, Tom. "Combustion Powered Pulsed Jet Actuators and Applications." In 4th Flow Control Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-4424.

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Abeysekera, Chamara, Arthur Suits, Ian Sims, Robert Field, Barratt Park, Lindsay Zack, Baptiste Joalland, James Oldham, and Kirill Prozument. "CHIRPED-PULSE FOURIER-TRANSFORM MICROWAVE/PULSED UNIFORM FLOW SPECTROMETER: THE LOW-TEMPERATURE, PULSED UNIFORM SUPERSONIC FLOW SYSTEM." In 69th International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2014. http://dx.doi.org/10.15278/isms.2014.mh02.

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Garnier, Eric, Marc Pruvost, Olivier Ducloux, Abdelkrim Talbi, Laeticia Gimeno, Philippe Pernod, R. Viard, A. Merlen, and V. Preobrazhensky. "Pulsed-Jet Micro-Actuators Evaluation for Flow Separation Control." In 4th Flow Control Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-4325.

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McManus, K., J. Magill, K. McManus, and J. Magill. "Airfoil performance enhancement using pulsed jet separation control." In 4th Shear Flow Control Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1997. http://dx.doi.org/10.2514/6.1997-1971.

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Salazar, M., S. Feng, J. Griego, and P. Reardon. "Assembly of Atlas Power Flow Channel." In 2005 IEEE Pulsed Power Conference. IEEE, 2005. http://dx.doi.org/10.1109/ppc.2005.300661.

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Stephen, Eric, Steve Mellinger, Tyler Weissinger, and Thomas McLaughlin. "Characterization of Corner Plasma Actuators for Pulsed Jet Production." In 6th AIAA Flow Control Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2012. http://dx.doi.org/10.2514/6.2012-3237.

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Scholz, Peter, Jens Ortmanns, Christian Kahler, and Rolf Radespiel. "Leading Edge Separation Control by Means of Pulsed Jet Actuators." In 3rd AIAA Flow Control Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2006. http://dx.doi.org/10.2514/6.2006-2850.

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Topolski, Magdalena, Nishul Arora, Mohd Ali, John Solomon, and Farrukh Alvi. "Experiments on Resonance Enhanced Pulsed Microjet Actuators in Supersonic Crossflow." In 6th AIAA Flow Control Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2012. http://dx.doi.org/10.2514/6.2012-2813.

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Johari, Hamid, and Gregory Rixon. "Evolution of a Pulsed Vortex Generator Jet in a Turbulent Boundary Layer." In 1st Flow Control Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-2834.

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Reports on the topic "Pulsed flow"

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Poggie, Jonathan. Numerical Modeling of Pulsed Electrical Discharges for High-Speed Flow Control. Fort Belvoir, VA: Defense Technical Information Center, February 2012. http://dx.doi.org/10.21236/ada558863.

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Williams, M. W., W. T. Pfeffer, and M. Knoll. Collaborative Experiment for Pulsed Radar Visualization of Water Flow Paths in Snow. Fort Belvoir, VA: Defense Technical Information Center, December 2000. http://dx.doi.org/10.21236/ada393212.

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Laity, George, Mark Johnston, Sonal Patel, and Michael Cuneo. Power Flow Spectroscopy Diagnostics & Platform Development at the Z Pulsed Power Facility. Office of Scientific and Technical Information (OSTI), October 2020. http://dx.doi.org/10.2172/1677519.

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Morrow, Katherine Elizabeth. Effects of pulsed and oscillatory flow on water vapor removal from a laboratory soil column. Final report, November 1993. Office of Scientific and Technical Information (OSTI), May 1993. http://dx.doi.org/10.2172/437709.

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Smith, G. V., and B. E. Lewis. Design of a pulsed-mode fluidic pump using a venturi-like reverse flow diverter. [With no packing glands, mechanical seals or moving parts]. Office of Scientific and Technical Information (OSTI), February 1987. http://dx.doi.org/10.2172/6806996.

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Kamai, Tamir, Gerard Kluitenberg, and Alon Ben-Gal. Development of heat-pulse sensors for measuring fluxes of water and solutes under the root zone. United States Department of Agriculture, January 2016. http://dx.doi.org/10.32747/2016.7604288.bard.

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The objectives defined for this study were to: (1) develop a heat-pulse sensor and a heat-transfer model for leaching measurement, and (2) conduct laboratory study of the sensor and the methodology to estimate leaching flux. In this study we investigated the feasibility for estimating leachate fluxes with a newly designed heat-pulse (HP) sensor, combining water flux density (WFD) with electrical conductivity (EC) measurements in the same sensor. Whereas previous studies used the conventional heat pulse sensor for these measurements, the focus here was to estimate WFD with a robust sensor, appropriate for field settings, having thick-walled large-diameter probes that would minimize their flexing during and after installation and reduce associated errors. The HP method for measuring WFD in one dimension is based on a three-rod arrangement, aligned in the direction of the flow (vertical for leaching). A heat pulse is released from a center rod and the temperature response is monitored with upstream (US) and downstream (DS) rods. Water moving through the soil caries heat with it, causing differences in temperature response at the US and DS locations. Appropriate theory (e.g., Ren et al., 2000) is then used to determine WFD from the differences in temperature response. In this study, we have constructed sensors with large probes and developed numerical and analytical solutions for approximating the measurement. One-dimensional flow experiments were conducted with WFD ranging between 50 and 700 cm per day. A numerical model was developed to mimic the measurements, and also served for the evaluation of the analytical solution. For estimation WFD, and analytical model was developed to approximate heat transfer in this setting. The analytical solution was based on the work of Knight et al. (2012) and Knight et al. (2016), which suggests that the finite properties of the rods can be captured to a large extent by assuming them to be cylindrical perfect conductors. We found that: (1) the sensor is sensitive for measuring WFD in the investigated range, (2) the numerical model well-represents the sensor measurement, and (2) the analytical approximation could be improved by accounting for water and heat flow divergence by the large rods.
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Riffe, Timothy, Kieron J. Barclay, Sebastian Klüsener, and Christina Bohk-Ewald. Boom, echo, pulse, flow: 385 years of Swedish births. Rostock: Max Planck Institute for Demographic Research, January 2019. http://dx.doi.org/10.4054/mpidr-wp-2019-002.

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KRISHNA, C. R., T. A. BUTCHER, and B. R. KAMATH. VARIABLE FIRING RATE OIL BURNER USING PULSE FUEL FLOW CONTROL. Office of Scientific and Technical Information (OSTI), October 2004. http://dx.doi.org/10.2172/15011382.

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Chang, Lang-Mann, and Stephen L. Howard. Influence of Pulse Length on Electrothermal Plasma Jet Impingement Flow. Fort Belvoir, VA: Defense Technical Information Center, December 2007. http://dx.doi.org/10.21236/ada476500.

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Griffin, John, Federico Nardari, and Rene Stulz. Daily Cross-Border Equity Flows: Pushed or Pulled? Cambridge, MA: National Bureau of Economic Research, June 2002. http://dx.doi.org/10.3386/w9000.

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