Bibliografías temáticas / Pulsatile flow

Literatura académica sobre el tema "Pulsatile flow"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 31 de enero de 2023

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Artículos de revistas sobre el tema "Pulsatile flow"

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Pier, Benoît y Peter J. Schmid. "Linear and nonlinear dynamics of pulsatile channel flow". Journal of Fluid Mechanics 815 (21 de febrero de 2017): 435–80. http://dx.doi.org/10.1017/jfm.2017.58.

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The dynamics of small-amplitude perturbations, as well as the regime of fully developed nonlinear propagating waves, is investigated for pulsatile channel flows. The time-periodic base flows are known analytically and completely determined by the Reynolds number $Re$ (based on the mean flow rate), the Womersley number $Wo$ (a dimensionless expression of the frequency) and the flow-rate waveform. This paper considers pulsatile flows with a single oscillating component and hence only three non-dimensional control parameters are present. Linear stability characteristics are obtained both by Floquet analyses and by linearized direct numerical simulations. In particular, the long-term growth or decay rates and the intracyclic modulation amplitudes are systematically computed. At large frequencies (mainly $Wo\geqslant 14$), increasing the amplitude of the oscillating component is found to have a stabilizing effect, while it is destabilizing at lower frequencies; strongest destabilization is found for $Wo\simeq 7$. Whether stable or unstable, perturbations may undergo large-amplitude intracyclic modulations; these intracyclic modulation amplitudes reach huge values at low pulsation frequencies. For linearly unstable configurations, the resulting saturated fully developed finite-amplitude solutions are computed by direct numerical simulations of the complete Navier–Stokes equations. Essentially two types of nonlinear dynamics have been identified: ‘cruising’ regimes for which nonlinearities are sustained throughout the entire pulsation cycle and which may be interpreted as modulated Tollmien–Schlichting waves, and ‘ballistic’ regimes that are propelled into a nonlinear phase before subsiding again to small amplitudes within every pulsation cycle. Cruising regimes are found to prevail for weak base-flow pulsation amplitudes, while ballistic regimes are selected at larger pulsation amplitudes; at larger pulsation frequencies, however, the ballistic regime may be bypassed due to the stabilizing effect of the base-flow pulsating component. By investigating extended regions of a multi-dimensional parameter space and considering both two-dimensional and three-dimensional perturbations, the linear and nonlinear dynamics are systematically explored and characterized.
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Feldmann, Daniel, Daniel Morón y Marc Avila. "Spatiotemporal Intermittency in Pulsatile Pipe Flow". Entropy 23, n.º 1 (30 de diciembre de 2020): 46. http://dx.doi.org/10.3390/e23010046.

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Despite its importance in cardiovascular diseases and engineering applications, turbulence in pulsatile pipe flow remains little comprehended. Important advances have been made in the recent years in understanding the transition to turbulence in such flows, but the question remains of how turbulence behaves once triggered. In this paper, we explore the spatiotemporal intermittency of turbulence in pulsatile pipe flows at fixed Reynolds and Womersley numbers (Re=2400, Wo=8) and different pulsation amplitudes. Direct numerical simulations (DNS) were performed according to two strategies. First, we performed DNS starting from a statistically steady pipe flow. Second, we performed DNS starting from the laminar Sexl–Womersley flow and disturbed with the optimal helical perturbation according to a non-modal stability analysis. Our results show that the optimal perturbation is unable to sustain turbulence after the first pulsation period. Spatiotemporally intermittent turbulence only survives for multiple periods if puffs are triggered. We find that puffs in pulsatile pipe flow do not only take advantage of the self-sustaining lift-up mechanism, but also of the intermittent stability of the mean velocity profile.
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Hindman, Bradley J., Franklin Dexter, Tom Smith y Johann Cutkomp. "Pulsatile Versus Nonpulsatile Flow". Anesthesiology 82, n.º 1 (1 de enero de 1995): 241–50. http://dx.doi.org/10.1097/00000542-199501000-00029.

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Background Although pulsatile and nonpulsatile cardiopulmonary bypass (CPB) do not differentially affect cerebral blood flow (CBF) or metabolism during hypothermia, studies suggest pulsatile CPB may result in greater CBF than nonpulsatile CPB under normothermic conditions. Consequently, nonpulsatile flow may contribute to poorer neurologic outcome observed in some studies of normothermic CPB. This study compared CBF and cerebral metabolic rate for oxygen (CMRO2) between pulsatile and nonpulsatile CPB at 37 degrees C. Methods In experiment A, 16 anesthetized New Zealand white rabbits were randomized to one of two pulsatile CPB groups based on pump systolic ejection period (100 and 140 ms, respectively). Each animal was perfused at 37 degrees C for 30 min at each of two pulse rates (150 and 250 pulse/min, respectively). This scheme created four different arterial pressure waveforms. At the end of each perfusion period, arterial pressure waveform, arterial and cerebral venous oxygen content, CBF (microspheres), and CMRO2 (Fick) were measured. In experiment B, 22 rabbits were randomized to pulsatile (100-ms ejection period, 250 pulse/min) or nonpulsatile CPB at 37 degrees C. At 30 and 60 min of CPB, physiologic measurements were made as before. Results In experiment A, CBF and CMRO2 were independent of ejection period and pulse rate. Thus, all four waveforms were physiologically equivalent. In experiment B, CBF did not differ between pulsatile and nonpulsatile CPB (72 +/- 6 vs. 77 +/- 9 ml.100 g-1.min-1, respectively (median +/- quartile deviation)). CMRO2 did not differ between pulsatile and nonpulsatile CPB (4.7 +/- 0.5 vs. 4.1 +/- 0.6 ml O2.100 g-1.min-1, respectively) and decreased slightly (0.4 +/- 0.4 ml O2.100 g-1.min-1) between measurements. Conclusions During CPB in rabbits at 37 degrees C, neither CBF nor CMRO2 is affected by arterial pulsation. The absence of pulsation per se is not responsible for the small decreases in CMRO2 observed during CPB.
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Kobayashi, N., S. Miyachi, T. Okamoto, K. Hattori, T. Kojima, K. Hattori, K. Nakai, S. Qian, H. Takeda y J. Yoshida. "Computer Simulation of Flow Dynamics in an Intracranial Aneurysm". Interventional Neuroradiology 10, n.º 1_suppl (marzo de 2004): 155–60. http://dx.doi.org/10.1177/15910199040100s127.

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Using a supercomputer, the authors studied the effect of vessel wall pulsation on flow dynamics with a three-dimensional model simulating both a rigid and pulsatile style. The design of the aneurysm models was set with a 5 mm dome diameter and a 1 or 3 mm orifice size to simulate a carotid-ophthalmic aneurysm. Flow dynamics were analyzed according to flow pattern, wall pressure and wall shear stress. The flow pattern in the aneurysm sac showed the great difference between rigid and pulsatile models particularly in the small-neck aneurysm model. The arterial wall tended to be exposed to a higher pressure peak in the pulsatile model than in the rigid one, especially at its bifurcation and curved regions. Sites of shear stress peak were found on the aneurysmal dome as well as at the distal end of the orifice in both rigid and pulsatile models. The effects of vessel-wall pulsation should be considered whenever evaluating conditions in and around an aneurysm.
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Grossi, Eugene A. y F. Gregory Baumann. "Pulsatile Flow". Annals of Thoracic Surgery 40, n.º 6 (diciembre de 1985): 638. http://dx.doi.org/10.1016/s0003-4975(10)60376-1.

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Minh, Chau Nguyen, Hassan Peerhossaini y Mojtaba Jarrahi. "Phototactic microswimmers in pulsatile flow: Toward a novel harvesting method". Biomicrofluidics 16, n.º 5 (septiembre de 2022): 054103. http://dx.doi.org/10.1063/5.0097580.

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Phototactic behavior is coupled with pulsatile flow features to reveal the advantages of pulsation for separating motile algae cells in a double Y-microchannel. The underlying mechanism is as follows: during half of the pulsation cycle, when the flow rate is low, the phototactic microswimmers are mainly redirected by the external stimulation (light); while, during the rest of the cycle, the flow effects become dominant and the microswimmers are driven toward the desired outlet. The results show that in the absence of light source, the pulsatile flow has no advantage over the steady flow for separation, and the microswimmers have no preference between the exit channels; the separation index (SI) is around 50%. However, when the light is on, SI increases to 65% and 75% in the steady and pulsatile flows, respectively. Although the experiments are conducted on the well-known model alga, Chlamydomonas reinhardtii, a numerical simulation based on a simple model demonstrates that the idea can be extended to other active particles stimulated by an attractive or repulsive external field. Thus, the potential applications can go beyond algae harvesting to the control and enhancement of separation processes without using any mechanical component or chemical substance.
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LIAO, WEI, T. S. LEE y H. T. LOW. "NUMERICAL STUDY OF PHYSIOLOGICAL TURBULENT FLOWS THROUGH STENOSED ARTERIES". International Journal of Modern Physics C 14, n.º 05 (junio de 2003): 635–59. http://dx.doi.org/10.1142/s0129183103004838.

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A detailed analysis on the characteristics of transitional turbulent flow over a bell-shape stenosis for a physiological pulsatile flow is presented. The comparison of the numerical solutions to three types of pulsatile flows, including a physiological flow, an equivalent pulsatile flow and a simple pulsatile flow, are made in this work. Then the effects of the Reynolds number, Womersley number and constriction ratio of stenosis on the pulsatile turbulent flow fields for the physiological flow are considered. The comparison of the three pulsatile flows shows that the flow characteristics cannot be properly estimated if an equivalent or simple pulsatile inflow is used instead of actual physiological one in the study of the pulsatile flows through arterial stenosis. The equivalent or simple pulsatile inflow can lead to higher disturbance intensity in the vicinity of the stenosis than the physiological inflow. For a physiological flow, the recirculation zones with high disturbance intensity occur mainly in the distal of the stenosis. The larger Reynolds number and severer constriction ratio may result in more complex flow field and cause some important flow variables to increase dramatically near stenosis. The higher Womersley number leads to a larger phase lag between the imposed flow rate changes and the final converged flow field in one cycle. The turbulence intensity decreases with the increase of Womersley number for the same Reynolds number.
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Valencia, Alvaro. "Pulsating Flow in a Channel With a Backward-Facing Step". Applied Mechanics Reviews 50, n.º 11S (1 de noviembre de 1997): S232—S236. http://dx.doi.org/10.1115/1.3101841.

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The incompressible laminar flow in a channel with a backward-facing step is studied for steady cases and for pulsating inlet flow conditions. For steady flows, the influrnce of the inlet velocity profile, the height of the step, and the Reynolds number on the reattachment length is investigated. A parabolic entrance profile was used for pulsating flow. It was found with amplitude of oscillation of one by Re = 100 that the primary vortex breakdown through one pulsatile cycle and the wall shear stress in the separation zone varied markedly with pulsating inlet flow.
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Mathie, RT, JB Desai y KM Taylor. "The effect of normothermic cardiopulmonary bypass on hepatic blood flow in the dog". Perfusion 1, n.º 4 (octubre de 1986): 245–53. http://dx.doi.org/10.1177/026765918600100403.

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Hepatic blood flow was investigated in two groups of eight anaesthetized dogs during and after one hour of either pulsatile or non-pulsatile cardiopulmonary bypass (CPB). Mean perfusion pressure was maintained at 60 mmHg. Hepatic arterial (HA) and portal venous (PV) blood flows were measured using electromagnetic flow probes, and hepatic O 2 consumption determined. The results demonstrate that: (a) pulsatile CPB reduces peripheral vascular resistance during and after perfusion, and more effectively preserves pump flow rate and cardiac output than non-pulsatile CPB; (b) total liver blood flow is sustained more effectively by pulsatile CPB than by non-pulsatile CPB due to relative preservation of both HA and PV flows; (c) hepatic O2 consumption is only marginally better preserved during and after pulsatile CPB than with non-pulsatile perfusion. We conclude that: (a) pulsatile CPB tends to maintain hepatic blood flow through a relative reduction in HA vascular resistance and an improvement in PV flow produced passively by a greater pump flow rate; (b) pulsatile CPB less effectively benefits hepatic O2 consumption because of poor O2 uptake from the hepatic PV blood supply.
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Jasikova, Darina, Michal Kotek, Frantisek Pochyly y Vaclav Kopecky. "Flow field velocity measurement of liquid interaction with rigid and flexible wall". EPJ Web of Conferences 213 (2019): 02031. http://dx.doi.org/10.1051/epjconf/201921302031.

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The motivation of this research was to determine the flow interactions on the pulsation and to express the influence on the flow character in the rigid and flexible tube. The character of Newtonian liquid was measured with the Particle Image Velocimetry method (PIV). Here, we used glass tube and Tygon tube for our comparison. We build the circuit equipped with membrane pump for generating pulsatile flow. The results were analysed over the pulse period sampled in 10 time steps. The fluid flow varied from Re 560 to Re 8800. The velocity profiles uncovered backward revers flows closed to the wall. These structures are prevailing close to flexible wall. The effect of interaction between pulsatile liquid flow and flexible wall was experimentally proved.
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Tesis sobre el tema "Pulsatile flow"

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Trabelsi, Faouzi. "Pulsatile flow in a conical tube". Thesis, University of Ottawa (Canada), 1993. http://hdl.handle.net/10393/6604.

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The present study of pulsatile flow in a conical tube, although fundamental in nature, may be used to determine blood flow characteristics in cannulae. For the experimental study, a transparent conical tube was connected to a mock circulation loop. Pulsatile flow was supplied by a pump ("artificial heart"), with controlled "pulse rate" and systolic time period ratio. Tests include flow visualization, pressure measurement with miniature piezo-resistive pressure transducers and velocity measurement with a two-component, frequency shifted, fibre optic, laser Doppler velocimeter. Flow visualization has revealed the formation of a high speed jet in the core of the conical tube during "diastole" as well as the appearance of separated and recirculating regions near the inclined wall. The formation of weak backflow ("regurgitation") was also observed during "systole", especially immediately upstream of the valve. Pressure variation in the tube was fairly complex, containing substantial fluctuations that are caused by the opening and closing of the valve. Measurements of the axial velocity along the centerline of the test section demonstrate an emerging downstream asymmetry of the "active" part of the velocity cycle, which is a clear indication of separation and recirculation in the conical tube. A large set of measurements have been analyzed in order to describe the detailed flow pattern during the cycle. Reverse flow took place at both the conical and the straight sections of the tube. However, in the conical section, the flow shows more unsteady and complex variation during the cycle. Also, the reverse flow near the wall region in the conical section occurred earlier in the diastolic phase, which is a clear indication of separation caused by the expansion. (Abstract shortened by UMI.)
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Ascough, John. "Pulsatile flow in curved elastic tubes". Thesis, Loughborough University, 1996. https://dspace.lboro.ac.uk/2134/32000.

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Wall shear stresses are thought to have an influence on the formation of deposits of blood fats on the linings of the arteries, in atherosclerosis. Measuring velocities close to an artery wall to determine wall shears is difficult in view of the thinness of the boundary layer. Analytical solutions are limited to simple geometries and numerical analyses of three-dimensional, unsteady blood flows are expensive in terms of computational time. In the present study, finite element analyses of blood flow in models representative of the human aorta are based on two-dimensional sections in order to reduce the computational requirement.
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Li, Hong-yu Graduate School of Biomedical Engineering Faculty of Engineering UNSW. "Mechanism studies for crossflow microfiltration with pulsatile flow". Awarded by:University of New South Wales. Graduate School of Biomedical Engineering, 1995. http://handle.unsw.edu.au/1959.4/17858.

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The mechanism of how pulsatile flow affects flux behaviour in crossflow micro-filtration was investigated. The effects of pulsatile flow were sub-divided into shear effects and backflushing effects. A servo-valve hydraulic piston pump was applied to generate pulsatile flows in the membrane module with particular waveforms. Four types of fluid pulsation with specific flow-rate and pressure waveforms were produced for experimental tests. Two parameters, /dVcf\dt/ maxand Pmin, were examined independently for their effect during pulsatile flow, which was estimated by comparing the cake resistance during steady flow and pulsatile flow at the same mean crossflow velocity, trans-membrane pressure and membrane resistance. Filtration tests for all the pulsatile flows with clean water confirmed that pulsatility only affects cake depositions. Without particles, no flux improvement was obtained. The results for the microfiltration of 0.5g/1 silica suspension showed that for pulsatile flows without backflushing (i.e. no negative transmembrane pressure peak), the fluid pulsation decreased cake resistance when the shear related parameter /dVcf\dt/max exceeded a critical value for each given waveform. When the instantaneous transmembrane pressure reached negative values, i.e. back-flushing occurred, the cake resistance was reduced for all pressure waves tested. Cake resistance was reduced more for more negative P min. With two of the waveforms tested, the cake resistance was almost completely eliminated. In contrast, the shear affected cake resistance reduction differently for each waveform. Comparing cake reduction results for different pulsatile waveforms, it was found that, for the square wave, the cake resistance reduction was higher for both shear and backflushing effect tests, while for the short spike waveform, the cake resistance reduction was lower. The flux waveforms were seen to follow the variations in transmembrane pressure. The flux response time was longer than the time required for the pressure changes, but was not dependent on the direction of the pressure change.
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Moschandreou, Terry. "Heat transfer with pulsatile flow in a tube". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq21326.pdf.

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Rajamohan, Divakar. "Developing Pulsatile Flow in a Deployed Coronary Stent". University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1131920589.

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Bridges, Ronald Craig II. "Pulsatile flow of a chemically-reacting non-linear fluid". Texas A&M University, 2003. http://hdl.handle.net/1969.1/5892.

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Many complex biological systems, such as blood and polymeric materials, can be approximated as single constituent homogeneous fluids whose properties can change because of the chemical reactions that take place. For instance, the viscosity of such fluids could change because of the chemical reactions and the flow. Here, I investigate the pulsatile flow of a chemically-reacting fluid whose viscosity depends on the concentration of a species (constituent) that is governed by a convection-reaction-diffusion equation and the velocity gradient, which can thicken or thin the fluid. I study the competition between the chemical reaction and the kinematics in determining the response of the fluid. The solutions to the equations governing the steady flow of a chemicallyreacting, shear-thinning fluid are obtained analytically. The solution for the velocity exhibits a parabolic-type profile reminiscent of the Newtonian fluid profile, if the fluids are subject to the same boundary conditions. The full equations associated with the fluid undergoing a pulsatile flow are studied numerically. A comparison of the shear-thinning/chemical-thinning fluid to the shear-thinning/chemicalthickening fluid using a new non-dimensional parameter–the competition number (CN) shows that both the shear-thinning effects and the chemical-thinning/thickening effects play a vital role in determining the response of the fluid. For the parameter values chosen, the effects of chemical-thinning/thickening dominate the majority of the domain, while the effects due to shear-thinning are dominant only in a small region near the boundary.
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Paciocco, Michael C. "Measurements of pulsatile flow in an idealized ventricular assist device". Thesis, University of Ottawa (Canada), 2009. http://hdl.handle.net/10393/28314.

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Ventricular Assist Devices (VAD) are mechanical pumps connected to the human circulatory system in order to assist the left ventricle of diseased hearts in pumping blood to the body. Currently, both pulsatile and non-pulsatile VAD are used, primarily as a bridge to heart transplantation, with new generation devices under development to become alternatives to transplantation. Negative interactions between the biological components of the flow and the mechanical system, such as poor washout, recirculation, thrombosis and hemolysis need to be minimized in order to improve performance and longevity of both the device and the patient. The present research is an experimental study of flow in a highly idealized, diaphragm-type, pulsatile-flow VAD. Its objective is to document in detail the motions of the fluid and the diaphragm so that they can be used for the validation of ongoing numerical simulations of flows in such devices, and more generally to assist in validation of computational methods involving fluid-structure interaction. Measurements of the flow field were collected using both Laser Doppler Velocimetry (LDV) and Particle Image Velocimetry (PIV). The PIV system was used to measure the instantaneous velocity variation along each of six different planes at several different times during the cycle, whereas the two component LDV system was used to measure the time-dependent velocity at several points of interest over the entire cycle. The images recorded by the PIV system camera have also been used to determine the instantaneous shape and position of the diaphragm at different times during the cycle. Representative and averaged PIV images showed that the inlet jet created a core vortex in the VAD that is the primary means of mixing. The development and motion of this vortex over the VAD operational cycle was documented for use in future modelling. A previously unobserved vortex was also documented. This vortex appeared in the vertical plane, beneath the inlet jet at peak injection, and moved along the path of the jet during the injection phase. It is believed that this vortex is created by the interaction of the inlet jet and the diaphragm in motion during injection and represents a region of recirculation in the flow, as well as possible flow separation. Other regions of recirculation were identified in the area directly adjacent to the outlet jet during ejection of the flow, and along the surface of the VAD directly opposite of the outlet tube just prior to the beginning of the ejection cycle. Areas of stagnant flow were also observed, particularly in the inlet and outlet tubes in periods of inactivity. The flow during ejection was localized in the region of the VAD directly adjacent to the outlet tube. The ejection has a longer period and a lower peak velocity than the injection. The motion of the VAD diaphragm was also studied and it was found that the diaphragm deformation was influenced by the inlet jet. The diaphragm shape was nearly axisymmetric during some parts of the cycle, but highly skewed during other parts. Small-scale motions were also present in the diaphragm, and fluctuated from one cycle to another, adding to irregularities in the flow. Dimensional analysis of the flow strongly suggested that the unsteady nature of the flow was the dominant feature of the flowfield. Recommendations for future experimental work include the addition of valves and a mock circulatory loop, as well as the use of different settings for the LDV and PIV systems for different parts of the VAD and different parts of the cycle.
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Lieber, Baruch Barry. "Ordered and random structures in pulsatile flow through constricted tubes". Diss., Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/13011.

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Moore, James E. Jr. "Steady and pulsatile flow visualization in the human abdominal aorta". Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/16351.

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Lau, Anna. "Effect of pulsatile flow on liquid phase packed bed adsorption". Thesis, University of Bath, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362237.

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Libros sobre el tema "Pulsatile flow"

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Zamir, M. The Physics of Pulsatile Flow. New York, NY: Springer New York, 2000. http://dx.doi.org/10.1007/978-1-4612-1282-9.

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Zamir, M. The Physics of Pulsatile Flow. New York, NY: Springer New York, 2000.

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The physics of pulsatile flow. New York: AIP Press, 2000.

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Kaplan, Adam Jay. Pulsatile flow patterns in a 45° side-to-end anastomosis model. Ottawa: National Library of Canada, 1993.

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Vinh, Bach. A finite element analysis of steady and pulsatile flow through a two-dimensional end-to-side model anastomosis. Ottawa: National Library of Canada, 1990.

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Reyes, J. R. Santos. Pulsating flow in turbocharger turbines. Manchester: UMIST, 1996.

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Dörfler, Peter, Mirjam Sick y André Coutu. Flow-Induced Pulsation and Vibration in Hydroelectric Machinery. London: Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-4252-2.

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Dörfler, Peter. Flow-Induced Pulsation and Vibration in Hydroelectric Machinery: Engineer’s Guidebook for Planning, Design and Troubleshooting. London: Springer London, 2013.

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Ascough, John. Pulsatile flow in curved elastic tubes. 1996.

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Symposium on Mechanisms and Biological Significance of Pulsatile Hormone Secretion (1999 : London, England), ed. Mechanisms and biological significance of pulsatile hormone secretion. Chichester, West Sussex, England: Wiley, 2000.

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Capítulos de libros sobre el tema "Pulsatile flow"

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Nichols, Wilmer. "Pulsatile Pressure–Flow Relations". En McDonald's Blood Flow in Arteries, 177–88. 7a ed. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781351253765-7.

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Naeije, R. "Pulsatile Flow Pulmonary Hemodynamics". En Update in Intensive Care and Emergency Medicine, 291–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-84423-2_33.

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Rai, Dinker B. "Venous flow is pulsatile". En Mechanical Function of the Atrial Diastole, 45–50. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/b22792-6.

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Rai, Dinker B. "Venous flow is pulsatile". En Mechanical Function of the Atrial Diastole, 45–50. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/b22792-6.

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Zamir, Mair. "Basic Elements of Pulsatile Flow". En Biological and Medical Physics, Biomedical Engineering, 81–122. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-24103-6_4.

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Zamir, M. "Equations of Fluid Flow". En The Physics of Pulsatile Flow, 23–37. New York, NY: Springer New York, 2000. http://dx.doi.org/10.1007/978-1-4612-1282-9_2.

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Zamir, M. "Steady Flow in Tubes". En The Physics of Pulsatile Flow, 39–65. New York, NY: Springer New York, 2000. http://dx.doi.org/10.1007/978-1-4612-1282-9_3.

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Zamir, M. "Pulsatile Flow in a Rigid Tube". En The Physics of Pulsatile Flow, 67–112. New York, NY: Springer New York, 2000. http://dx.doi.org/10.1007/978-1-4612-1282-9_4.

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Zamir, M. "Pulsatile Flow in an Elastic Tube". En The Physics of Pulsatile Flow, 113–45. New York, NY: Springer New York, 2000. http://dx.doi.org/10.1007/978-1-4612-1282-9_5.

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Zamir, M. "Preliminary Concepts". En The Physics of Pulsatile Flow, 1–21. New York, NY: Springer New York, 2000. http://dx.doi.org/10.1007/978-1-4612-1282-9_1.

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Actas de conferencias sobre el tema "Pulsatile flow"

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Saloner, D. "Flow velocity measurements for pulsatile flow". En Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 1988. http://dx.doi.org/10.1109/iembs.1988.94543.

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Nguyen, Minh Chau, Hassan Peerhossaini, Mohammad Mehdi Salek y Mojtaba Jarrahi. "Control of Particle Distribution at the Outlet of a Double Y-Microchannel Using Pulsatile Flow". En ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-5219.

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Abstract While a variety of active and passive techniques have been proposed for steady flows, pulsatile flow has received much less attention. Pulsation makes more control parameters available for passive methods and enables them to separate particles. The purpose of this work is to determine the effects of phase shift between two entering flows (only one includes the particles) on particle separation inside a double Y-microchannel. Numerical simulations were carried out for both steady and pulsating flow conditions. The results showed that when the velocity amplitude ratio (β) is less than 2, the separation index increases with the phase shift (φ) and the highest efficiency occurs at φ = 180°. A similar trend can be observed for higher values of β only if the pulsation period is short enough. A series of experiments qualitatively validated the numerical results.
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Tubaldi, E., M. Amabili y F. Alijani. "Nonlinear Vibrations of Plates in Axial Pulsating Flow". En ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-37283.

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A theoretical approach is presented to study nonlinear vibrations of thin infinitely long rectangular plates subjected to pulsatile axial inviscid flow. The case of plates in axial uniform flow under the action of constant transmural pressure is also addressed for different flow velocities. The equations of motion are obtained based on the von Karman nonlinear plate theory retaining in-plane inertia via Lagrangian approach. The fluid model is based on potential flow theory and the Galerkin method is applied to determine the expression of the flow perturbation potential. The effect of different system parameters such as flow velocity, pulsation amplitude, pulsation frequency, and channel pressurization on the stability of the plate and its geometrically nonlinear response to pulsating flow are fully discussed. In case of zero uniform transmural pressure numerical results show hardening type behavior for the entire flow velocity range when the pulsation frequency is spanned in the neighbourhood of the plate’s fundamental frequency. Conversely, a softening type behavior is presented when a uniform transmural pressure is introduced.
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Kolosov, Andrey, Anatoly Larionov, Julia Nekrasova y Natalya Podolskaya. "Pulsatile flow auxiliary blood circulation system". En 2021 International Conference on Electrotechnical Complexes and Systems (ICOECS). IEEE, 2021. http://dx.doi.org/10.1109/icoecs52783.2021.9657311.

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Varghese, Sonu S., Steven H. Frankel, Robin Pitt y Spencer J. Sherwin. "NUMERICAL SIMULATION OF PULSATILE FLOW THROUGH STENOTIC VESSELS". En Third Symposium on Turbulence and Shear Flow Phenomena. Connecticut: Begellhouse, 2003. http://dx.doi.org/10.1615/tsfp3.1350.

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Salek, M. Mehdi, Sharul S. Dol y Robert J. Martinuzzi. "Analysis of Pulsatile Flow in a Separated Flow Region". En ASME 2009 Fluids Engineering Division Summer Meeting. ASMEDC, 2009. http://dx.doi.org/10.1115/fedsm2009-78302.

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A Backward-Facing Step (BFS) is widely used as an in-vitro model to investigate the influence of flow separation and recirculation observed in biomedical devices, arterial bifurcations and stenoses. In this study we numerically investigate the flow over a BFS with an expansion ratio of 2 and pulsed velocity at the inlet. The main objective is to study the effects of oscillation frequency and amplitude on flow evolution and interaction between vortices. The pulsatile flow leads to a breakdown of the primary recirculation vortex and the generation of a secondary upper wall instability at lower Reynolds numbers than in the steady case. The results show that the amplitude coefficient plays a dominant role in the primary vortex formation but the frequency determines the amount of circulation convected downstream.
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Khiabani, Reza H., Maria Restrepo, Elaine Tang, Diane De Zélicourt, Mark Fogel y Ajit P. Yoganathan. "Effect of Flow Pulsatility on Modeling the Total Cavopulmonary Hemodynamics: A Numerical Investigation". En ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80751.

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Single Ventricle Heart Defects (SVHD) are present in 2 per 1000 live births in the US. SVHD are characterized by cyanotic mixing between the de-oxygenated blood from the systemic circulation return and the oxygenated blood from the pulmonary arteries. Palliative surgical repairs (Fontan procedure) are performed to bypass the right ventricle in these patients. In current practice, the surgical interventions commonly result in the total cavopulmonary connection (TCPC). In this configuration the systemic venous returns (inferior vena cava, IVC, and superior vena cava, SVC) are directly routed to the right and left pulmonary arteries (RPA and LPA), bypassing the right heart. The resulting anatomy has complex and unsteady hemodynamics characterized by flow mixing and flow separation. Pulsation of the inlet venous flow during a cardiac cycle results in complex and unsteady flow patterns in the TCPC. Although various degrees of pulsatility have been observed in vivo, non-pulsatile (time-averaged) flow boundary conditions have traditionally been assumed in modeling TCPC hemodynamics, and only recently have pulsatile conditions been incorporated without completely characterizing their effect or importance. In this study, 3D numerical simulations were performed to predict TCPC hemodynamics with both pulsatile and non-pulsatile boundary conditions and to investigate the accuracy of applying non-pulsatile boundary conditions. Flow structures, energy dissipation rate and pressure drop were compared under rest and estimated exercise conditions. The results show that TCPC hemodynamics can be strongly influenced by the presence of pulsatile flow. However, there exists a minimum pulsatility threshold, identified by defining a weighted pulsatility index (wPI), above which the influence is significant.
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8

Liu, Qin y Hai-Chao Han. "Mechanical Buckling of Artery Under Pulsatile Flow". En ASME 2011 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2011. http://dx.doi.org/10.1115/sbc2011-53462.

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Tortuous or twisted arteries, often seen in carotid and many other arteries, can lead to transient ischemic attacks to distal organs including stroke [1]. The mechanisms for the development of tortuous arteries remain unclear. Our recent studies [1, 2] suggested that artery bent buckling could be a possible mechanism for vessel tortuosity. However, these studies were performed under static pressure but arteries in vivo are usually under pulsatile flow where both the mean pressure and pulse pressure may change at physiological or pathological conditions. The aim of this study was to investigate the biomechanical buckling of arteries under pulsatile flow to determine the effect of pulsatile flow on the critical buckling pressure.
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9

Ishii, Kohei, Kyohei Hosoda, Takashi Isoyama, Itsuro Saito, Koki Ariyoshi, Yusuke Inoue, Masami Sato et al. "Pulsatile driving of the helical flow pump". En 2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2013. http://dx.doi.org/10.1109/embc.2013.6610103.

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Sadelli, Lounis, Matthieu Fruchard y Antoine Ferreira. "Adaptive control of microrobot in pulsatile flow". En 2014 IEEE Conference on Control Applications (CCA). IEEE, 2014. http://dx.doi.org/10.1109/cca.2014.6981594.

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Informes sobre el tema "Pulsatile flow"

1

Dechant, Lawrence J. Estimation of Several Turbulent Fluctuation Quantities Using an Approximate Pulsatile Flow Model. Office of Scientific and Technical Information (OSTI), diciembre de 2015. http://dx.doi.org/10.2172/1331517.

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Sakurai, Masato y Kenichi Tanaka. Computational Simulation of Exhaust Pulsating Flow and Orifice Noise (First Report). Warrendale, PA: SAE International, mayo de 2005. http://dx.doi.org/10.4271/2005-08-0166.

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Sakurai, Masato y Yuuya Kasajima. Computational Simulation of Exhaust Pulsating Flow and Orifice Noise (Second Report). Warrendale, PA: SAE International, septiembre de 2005. http://dx.doi.org/10.4271/2005-08-0642.

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Gao, Meihong, Chengchun Zhan, Tianyu Du, Xiaowei Sun, Jing Wang, Qui Wang y Shuai Wang. The Impact of the Plaques on the Pulsating Flow Characteristics in the Stenotic Femoral Artery. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, julio de 2021. http://dx.doi.org/10.7546/crabs.2021.07.16.

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