Pulsating Flow Research Articles

Experimental Investigation of Flameholding in Scramjet Combustor by Pylon with Plasma Actuator Based on Q-DC Discharge

This paper presents the results of testing and optimization of a plasma-assisted combustion scheme based on a pylon for fuel injection equipped with a plasma actuator. Electrodes were installed behind the stern of the pylon for the creation of Q-DC discharge with voltage U = 200–2500 V and current I = 3–7.5 A. The experiments were performed in the PWT-50 supersonic wind tunnel of the JIHT RAS under the following conditions: Mach number M = 2, static pressure ~200 Torr, stagnation temperature T0 = 300 K. Gaseous fuel ethylene was used and the fuel mass flow rate was 0.5–4 g/s. The pylon had a streamlined shape that prevented the formation of a stagnant zone; plasma-assisted combustion was performed under more difficult conditions compared to plasma-assisted combustion on a flat wall, where separated flows near the wall are easily formed by discharge. In this work, two new geometries of pylon equipped with electrodes were proposed and experimentally tested. A second version providing a longer discharge length demonstrates stable ignition and intense combustion in a fully discussed fuel mass flow rate. The process of ignition in a supersonic flow and flame front pulsations was described. A reduction in the energy input in comparison with the previously considered configurations of plasma-assisted combustion was also demonstrated.

Снижение колебаний массы бумаги в бумагоделательной машине

The subject of the research is a paper for sanitary-hygienic purposes. The objects of the study are a pulper infeed system and a round grid perforated forming device. The purposes of the work are to identify sources and reduce fluctuations of 1 m2 of pulp for sanitaryhygienic paper, which decrease the structural irregularities of the paper web in longitudinal and transverse directions. The methodology of the study is to investigate the flow pulsation of the pulp, the fluctuations of the pulp web at the Yankee cylinder (without crepe), to verify the tensile strength of the paper web in longitudinal and transverse directions for identification of a correlation between the pulsation, the vibration of the pulp and the strength of the paper web. The trials were made during the production of sanitary-hygienic paper with the mass 17–18 g/m2 at a steady working speed of the machine 5 m/s. Pulsations of paper pulp in the low-frequency spectrum of 0.14–1.35 Hz prevail in the mass-intake device. The rectangular paper samples 432×230 mm2 were created for examination of structural irregularities of the paper web. The length 432 mm was taken in the longitudinal direction of paper movement in the machine. It was equal to 0.125 mm in the circumference of the round grid screen cylinder. The width of the paper web in the commodity bobbin was 230 mm. The samples were made from a single sheet of paper sequentially without intermediate cuts at 5 m/s speed of the machine. It was determined that the frequencies of fluctuations of the masses of sanitary paper samples coincide by 86 % with the pulsation frequencies of the pulp and depend on other factors by 14 %. The major frequency was 1.45 Hz. The amplitude of the deviation of the mass at this frequency from the arithmetic mean was 0.026 g. The tensile strength of the paper web in the machine direction was 5.6 times greater than in the transverse direction. It was caused by unregulated rotation frequency of the holey roll and clogging of its holes. The significant change of speed of the pulp flow on the short cylindrical part of the vacuum chambers initiated synchronically low frequency pulsation of the pulp and fluctuations of masses of the paper samples, therefor, the paper web in the machine. The irregularities of the structure of the paper web create the frequent paper breaks and reduced quality of the commodity products.

Study on Multi-flow Field Characteristics of Unloading Groove Spacing of Bidirectional Gear Pump

Improving the output flow quality of the high-precision micro bidirectional gear pump can effectively improve the position control accuracy and dynamic characteristics of the electro-hydraulic actuator. In order to meet the appeal requirements and reduce the vibration and noise of the gear pump and prolong its working life, this paper starts with the research of the key part of the gear pump–the unloading groove structure. The three characteristics of trapped oil phenomenon, cavitation phenomenon, and flow were used as key indices to evaluate gear pump performance. Using numerical simulation analysis, the dynamic grid simulation method was used to explore the influence of unloading groove spacing on the transient multi-flow field characteristics of the gear pump under conventional design range. Our results show that reducing the distance between unloading grooves can greatly reduce the trapped oil pressure and the amount of gas precipitation in the flow field, while reducing flow pulsation and improving volumetric efficiency. However, when the unloading groove spacing is too small, the instantaneous flow curve loses the pulsation characteristics and the flow stability decreases. Considering the influence of the gear pump on the accuracy of the electro-hydraulic actuator and the performance of the gear pump itself, the analytic hierarchy process was used to obtain the 1 mm unloading slot spacing, which best meets the engineering requirements of high flow accuracy and low vibration noise. The results provide a basis for work on the structural optimization of high-precision micro gear pumps.

Utilizing artificial neural networks to predict the thermal performance of conical tubes with pulsating flow

A novel model of an artificial neural network is presented to predict friction factor and Nusselt number for pulsating flow in conically coiled tubes. The tubes are manufactured with coil torsions ranging between 0.02 and 0.052 and are subjected to a uniform heat flux. Experiments using pulsating flow with a pulsating frequency of 4 to 10Hz and a Reynolds number between 4836 and 12,562 were expanded. In terms of overall heat transfer improvement, the pulsing flow with a frequency of 4 Hz performs the best within the investigated range. Results demonstrated that the Nusselt number and thermal performance index increased when the Reynolds number and coil torsion decreased. The results predicted by a Feed-forward neural network were compared to the actual experimental data. A comparison showed that a feed-forward neural network could predict the Nusselt number and friction factor. The average root mean square error for the predicted Nusselt number was 4.6025. There is a good agreement between the predicted values and the experimental values. At the same Reynolds number and with a frequency of 4 Hz, reducing coil torsion from 0.052 to 0.02 improves Nusselt number by 23 % and 10 %, experimentally and in a feed-forward neural network, respectively.

Quantitative Assessment of Aortic Hemodynamics for Varying Left Ventricular Assist Device Outflow Graft Angles and Flow Pulsation.

Left ventricular assist devices (LVADs) comprise a primary treatment choice for advanced heart failure patients. Treatment with LVAD is commonly associated with complications like stroke and gastro-intestinal (GI) bleeding, which adversely impacts treatment outcomes, and causes fatalities. The etiology and mechanisms of these complications can be linked to the fact that LVAD outflow jet leads to an altered state of hemodynamics in the aorta as compared to baseline flow driven by aortic jet during ventricular systole. Here, we present a framework for quantitative assessment of aortic hemodynamics in LVAD flows realistic human vasculature, with a focus on quantifying the differences between flow driven by LVAD jet and the physiological aortic jet when no LVAD is present. We model hemodynamics in the aortic arch proximal to the LVAD outflow graft, as well as in the abdominal aorta away from the LVAD region. We characterize hemodynamics using quantitative descriptors of flow velocity, stasis, helicity, vorticity and mixing, and wall shear stress. These are used on a set of 27 LVAD scenarios obtained by parametrically varying LVAD outflow graft anastomosis angles, and LVAD flow pulse modulation. Computed descriptors for each of these scenarios are compared against the baseline flow, and a detailed quantitative characterization of the altered state of hemodynamics due to LVAD operation (when compared to baseline aortic flow) is compiled. These are interpreted using a conceptual model for LVAD flow that distinguishes between flow originating from the LVAD outflow jet (and its impingement on the aorta wall), and flow originating from aortic jet during aortic valve opening in normal physiological state.

DDPM simulation of the erosion of immersed tubes in a pulsating fluidized bed

In this study, the effects of the type of pulsating inlet waveform, pulsation frequency, and pulsation amplitude on the stability of fluidized beds and the erosion of immersed tubes were investigated by numerical simulation. Compared with rectangular and triangular inlet flows, sinusoidal flow induced the lowest immersed-tube erosion rate and pressure-drop fluctuation in the fluidized bed. Furthermore, under sinusoidal flow with a pulsation frequency of 1 Hz and pulsation amplitude of 0.25um, the immersed-tube erosion rate was lower by 1.8 %, standard deviation of pressure drop by 14.16 %, and energy generated from bubble rupture by 47.83 % than those under uniform flow. A dimensionless parameter χp that can represent immersed-tube erosion during pulsating flow was proposed, which reflects the effect of particle flow characteristics, particle fluidization degree, and pulsation frequency on immersed-tube erosion.

The Analysis of Cavitation Flow and Pressure Pulsation of Bi-Directional Pump

A bi-directional pump is designed by using S-shaped hydrofoil, is the most convenient way to achieve bi-directional operation. In this paper, high-speed photography is used to visualize the flow field characteristics of the bidirectional pump under different cavitation numbers, and the flow field changes caused by cavitation are quantitatively analyzed in combination with the pressure pulsation sensor. The results show that the operation efficiency of the bidirectional pump in reverse operation is lower than that in forward operation. Tip clearance cavitation occurs on both suction and pressure surfaces of the impeller under reverse operation and large flow. In reverse operation, the influence of guide vane on the main frequency of pressure pulsation in the impeller is obvious. The quasi-periodic vertical cavitation flow phenomenon increases the amplitude of pressure pulsation in the impeller and becomes the main component of the internal flow in the bidirectional axial flow pump.

Regulating the Gas–Liquid Slug Flow in Microchannels through High-Frequency Pulsatile Perturbations

The gas–liquid slug flow that is characterized with alternate formation of gas and liquid segments has been widely applied for chemical synthesis and analysis. For its applications, it is essential to precisely control the gas and liquid slug lengths. However, using the passive method, the bubble/droplet generation frequency and their sizes are influenced by multiple parameters including the channel dimension, fluid physical properties, the gas-to-liquid flow rate ratio, and so forth and hence lack control flexibility. In this work, an active approach using pulsatile perturbations to control the gas–liquid slug flow is demonstrated. A rotating valve is applied to produce a high-frequency pulsating air flow. Under its influence, either Taylor bubbles in a hydrophilic channel or liquid-in-gas droplets in a hydrophobic channel can be generated synchronously with the flow pulsation. Therefore, the gas and liquid slug lengths can be independently tuned via the air inlet pressure and the liquid flow rate, respectively. The maximum generation frequency is up to ∼1300 Hz. In addition, the effects of the pulsation frequency, the pulse duty ratio, and the liquid viscosity are also investigated. This technique provides an efficient method to regulate the gas–liquid slug flow in multiphase microreactors or microfluidic analytical systems.

Sediment vibration characteristics based on accelerometer measurements

The study of the vibration phenomenon of pebbles under turbulence is still a gap despite recent technological advancements in measurement capabilities. In this study, the vibration process of a fully exposed, isolated smart pebble on a rough bed was measured using a miniature inertial accelerometer and combined with simultaneous local measurements of the near-bed velocities. The paper conducts a series of experimental studies with different flow conditions. The test data match well with the manually observed phenomena, indicating the authenticity of the sediment vibration data collected by the measurement system. The test results show that the pebble motion (before entrainment) subjected to turbulence is a nonlinear vibration process, and its vibration types include in-situ vibration and ex-situ strong vibration. The probability distribution for the amplitude of vibration acceleration is well parameterized by the normal distribution. The vibration intensity tends to increase before approaching the threshold, but it weakens when approaching the point. The sediment vibration frequency is within 20–25 Hz, similar to the flow pulsation frequency and belongs to low-frequency vibration. The data indicate that the near-bed flow velocity is most directly related to the particle vibration events.

Dynamic characteristics analysis of long stroke reciprocating pump combined crank-linkage with rack-pinion mechanism

Drilling pump is the heart of drilling rig, its core structure is crank-linkage mechanism. However, the drilling pump is criticized for its short stroke and high stroke frequency. Aiming at these defects, a long stroke reciprocating (LSR) pump combined the crank-linkage with a rack-pinion mechanism is proposed, and its dynamic and flow characteristics are researched. The results reveal that the stroke of the LSR pump is extended twice when the crank radius stays the same. The stroke frequency and flow pulsation rate are lowered under the same rated power. A new multi-fulcrum crankshaft is designed to extend its fatigue life, and the reaction forces of each fulcrum are solved by simulation. The influence of the fulcrums position on the crankshaft modal frequency is further investigated. The flexible characteristics of the multi-fulcrum crankshaft are studied by rigid-flexible coupled analysis. The results show that more fulcrums can effectively reduce the stress of crankshaft, and the maximum stress of the multi-fulcrum crankshaft is only 178.6 MPa. The modal frequency of the multi-fulcrum crankshaft is increased due to more fulcrums, which proved its stiffness and stability are improved. The fatigue life of the multi-fulcrum crankshaft is predicted to reach 30,000 h by finite element analysis. This study would provide a theoretical basis for further development of the LSR pump.

Intensification of Droplet Disintegration for Liquid–Liquid Systems in a Pulsating Flow Type Apparatus by Adding an Inert Gas

Experimental studies have revealed that the introduction of a small amount (0.5% by volume) of permanent and chemically inert gas bubbles leads to the intensification of droplets disintegration in a liquid–liquid system (emulsification) in a pulsating flow type apparatus. The liquids used were water (continuous phase) and oil (dispersed phase) at room temperature, and nitrogen was used as a gas. The gas hold-up φin was varied in the range of 0% to 4%. The volume fraction of the dispersed phase (oil) was 1% with respect to the continuous phase. The size of the oil droplets was determined by microphotographs; at least 600 drops were photographed in each experiment. The optimal gas hold-up in terms of the highest interfacial area (for the studied conditions) was found to be 0.5%, at which value the droplets’ Sauter mean diameter d32 decreased 1.88 times, and the maximum droplet size decreased 1.3 times, compared with the case without gas input. The effect of decreasing the average droplet size d32 upon the injection of an inert gas in the continuous phase disappears at φin ≈ 2%. The pressure loss at φin ≤ 2% within the measurement error remained constant, while at 4%, it increases by only 5.4%. The role of an inert gas is explained by several factors: (i) a redistribution of momentum over the volume of liquid; (ii) the occurrence of microflows near bubbles and drops, which leads to an increase in shear stresses on the surface of the drops; and (iii) gas bubbles act as pseudocavitation bubbles, whereby when they collapse, they break up adjacent droplets.

Research on measurement method for high-frequency pulsation flow of hydrogen circulating pump

The hydrogen circulating pump (HCP) used for hydrogen recovery and utilization, affects the performance of the hydrogen fuel cell system. In this paper, aiming at the measurement research blank of the output pressure and flow high-frequency pulsation curve of the HCP, a pressure-based flow measurement method and an overlapping grid-based simulation calculation method are proposed and then compared in multiple directions for mutual verification. The research results show that the waveform errors of the pressure pulsation curves are under 2.4%, and that of the flow pulsation curves are 6.2% and 8.3%, comparing the experimental data and simulation data when the average outlet pressure is 9kpa and 27kpa respectively. Further study of the internal fluid characteristics, the pressure and the density change the same and produce the lowest value before the meshing point, the leakage flow rate at the rotor-rotor gap is greater than that at the rotor-pump casing gap, and the vortices show cyclical change of co-evolution and co-growth in the low-pressure area and the high-pressure area. The research results can optimize the structural design of the HCP itself, and can also refine the input conditions of the fuel cell system and contribute to performance improvement.

Experimental investigation of the pulsing flow field around four types of spiked-blunt body at Mach 2.2

In this paper, unsteady flow pulsation over four types of spiked-blunt body model and related pulsation suppression methods are investigated through wind tunnel experiments. Direct-connect wind tunnel is used to provide supersonic incoming flow of Ma 2.2 and a classic pointed spike and three types of aerodome spike are tested at zero/non-zero angle of attack. High-speed schlieren and dynamic pressure sensors are used to capture the dynamic evolution of unsteady flow field around the spikes. Then the measurement results with high spatial-temporal resolution are processed with three statistical methods. Results indicate that the aerodome spike can effectively suppress the flow pulsation both at zero/non-zero angle of attack. The suppression effect of standard/double aerodome and inverse aerodome can reach 60.9% and 47.3%, respectively. By using the aerodome, the pulsation mode can be transformed into a special state between oscillation mode and pulsation mode, named ‘suppressed pulsation mode’. In the suppressed pulsation mode, the original large-scale motion of shock wave system is decomposed into a stable foreshock and a slightly unsteady aftershock with small-scale periodic movement. The statistical results further reveal that the unsteady motion of afterbody shock is closely related to the stability of the recirculation zone and the key to suppress the flow pulsation is to create a stable recirculation zone ahead the blunt body.

Numerical analysis of the internal flow and pressure pulsation characteristics of a submersible tubular electric pump device

In order to clarify the non-constant flow characteristics of the impeller and bulb body of the submersible tubular electric pump device, the entire flow rate conduit of the pump device is numerically calculated using the numerical simulation method, focusing on the analysis of the non-constant flow field characteristics of the guide vane body and bulb body and the time–frequency variation law of the pressure pulsation, and the results of the physical model testing confirm the validity of the numerical simulation. The findings demonstrate that the impeller of a submersible tubular electric pump is mostly responsible for the impeller’s inlet pressure pulsation, and the number of impeller blades to the number of peaks and valleys is consistent. Under the high flow rate condition of 1.2 Qd, the pressure fluctuation in the impeller inlet, between the impeller and the guide vane is small, and the main frequency is located at three times the rotational frequency, and the pressure pulsation at the outlet of the guide vane body has no obvious pattern and small amplitude. As the flow rate increases, the peak value of pressure pulsation at each monitoring point in the characteristic section of the pump device gradually decreases. The pressure pulsation peak value varies widely, ranging from 0.058 to 0.15, at each monitoring location of the impeller inlet. The peak value of pressure pulsation at each monitoring point of the impeller outlet fluctuates less due to the change of flow rate. The size and scale of the omega vortex structure in the guide vane body at different moments of the same cycle is small, and the number of vortex structures from the guide vane body inlet to the outlet direction shows a gradual increase in the trend; with a rise in flow rate, there is a tendency for the velocity and deflection angle of the guide vane body outlet and bulb body outlet surface to decrease.

Artificial neural network-based multi-objective optimization of cooling of lithium-ion batteries used in electric vehicles utilizing pulsating coolant flow

Due to the enhancement of production and development of electric vehicles, their improved performance has attracted much attention. Lithium-ion battery packs that supply the energy needed for electric vehicles require cooling to enhance their function, reduce costs and increase lifetime. The current work investigates the effect of using pulsating flow instead of steady flow on batteries' maximum temperature and temperature difference. In this respect, two different arrangements have been utilized with a commonly used cylindrical lithium-ion battery named 18650. The results demonstrate that pulsating flow decreases the maximum temperature and maximum temperature difference by 27% and 50%, respectively, in an optimal setting. The influence of three main characteristics of pulsating flow on the battery pack cooling system has been studied. These characteristics are the Strouhal number and the oscillation amplitude, while the Reynolds number is taken as a parameter. In both arrangements, by increasing the amplitude, maximum temperature and maximum temperature difference are reduced. As expected, increasing the Reynolds number would improve cooling performance. The effect of the Strouhal number on the maximum temperature and maximum temperature difference indicates the existence of extremum points in both arrangements. Moreover, the optimum points in both battery packs are different, which means the optimum point depends on the geometry. A double-objective optimization was carried out using a surrogate model obtained by artificial intelligence to find the Pareto front for minimizing both the maximum temperature and the maximum temperature difference. Moreover, for the best points on the Pareto front, the optimal Strouhal number in the staggered and in-line arrangement of batteries are 0.5457 and 0.369, respectively.

Numerical study of local heat transfer in tube bundle in pulsating flow

Forced pulsating flows enhance the heat transfer of various heat exchange equipment; however, such flows remain poorly understood. A numerical simulation was used to study how the position of a cylinder in a tube bundle affects the heat transfer during pulsating flow. The tubes of the tube bundle were arranged in an in-line order with the same relative pitch of 1.4. The Reynolds number and Prandtl number had constant values of 1500 and 4.03, respectively. The pulsating flow exhibits a reciprocating asymmetrical character. The pulsation amplitude related to the cylinder diameter was in the range from 0.1 to 0.4, and the pulsation frequency was in the range from 0.2 to 0.8 Hz. The numerical simulation results indicated that the heat transfer of the cylinder in the tube bundle was affected by the row number. With pulsating flow, the heat transfer of the cylinder in the first row had a minimum value, whereas the maximum heat transfer was observed in the last row. The effect of the position of the cylinder along the flow in the tube bundle decreases with increasing pulsation intensity. The maximum heat transfer enhancement of 51% was observed in the first row at a frequency of 0.8 Hz and amplitude of 0.4.

Pulsating flows of viscous fluid in flat channel for given harmonic fluctuation of flow rate

In research work, it is pointed out the issue of a pulsating flow of a viscous incompressible fluid in a flat channel for a given harmonic fluctuation of the fluid flow rate. The study of the generation of pulsating current is used in biological mechanics, in particular, in the use of microchip systems. In addition, to ensure a constant flow of liquid, pneumatic micropumps that periodically squeeze liquid from empty volumes are widely used. In such systems, the installation of pulsating flow is shown to be economically beneficial. The transfer function of the amplitude-phase rate response is determined; with the help of these functions, the ratio of the tangential shear pressure on the channel fence to the average acceleration over the channel section is determined. In Figure 1, it can be seen that the ratio of KH = 0 of in τHC/τ0KC is close to one and α02 is less than one. If α02 takes on values greater than unity, then the ratio of to KH = 0 to τHC/τ0KC is greater than unity, and it has been shown to increase with increasing frequency of dimensionless oscillation. It was shown that in an unsteady flow of liquid, even in cases where liquid acceleration is equal to zero, it was studied that the stress on the wall of the channel exceeds its quasi-stationary value. τHC/τ0KC with the increase of the ratio KH, the increase of the parameter is explained by the fact that the change of the tensile stress on the wall advances in phases concerning the average speed along the section. Calculations determine that the non-stationary shear pressure on the channel fence increases non-monotonically with the acceleration of the liquid particle at low oscillation frequencies. The shear pressure reaches its maximum value, then decreases with increasing dimensionless oscillation rate, and asymptotically approaches the values without accelerated flow.

HEAT TRANSFER ENHANCEMENT IN A CHANNEL WITH INCLINED BAFFLES UNDER PULSATING FLOW: A CFD STUDY

This study numerically investigated hydraulic and thermal performance in a channel with inclined baffles under pulsating flow conditions. The baffles were placed in a staggered arrangement. The governing equations were discretized with the finite volume method (FVM), and the pressure-velocity coupling was handled by the SIMPLE algorithm. The Strouhal number (St: 0.5,1, 2, 3, and 4), pulsation amplitude (A: 0.2, 0.5, and 0.8), and Reynolds number (200 ≤ Re ≤ 1000) were changed. The top and bottom surfaces of the channel were kept at <i>T</i><sub>ω</sub> = 350 K, and thermal improvement and friction factor were calculated for a pulsating cycle. The results were given in terms of thermal enhancement (η), relative friction factor (<i>f</i><sub>rel</sub>), and performance evaluation criteria (PEC). The flow and temperature contours were presented to determine the impacts of the pulsation frequency, the pulsation amplitude, and the Reynolds number. The results showed that the pulsation amplitude and the pulsation frequency contributed remarkably to thermal enhancement with increasing Reynolds numbers, while the heat transfer improved significantly depending on pulsation parameters together with a slight rise in friction factor. The highest thermal enhancement achieved was about 1.47 at <i>Re</i> = 1000, <i>A</i> = 0.8, and <i>St</i> = 4. The highest PEC obtained was approximately 1.12 at <i>Re</i> = 1000, <i>A</i> = 0.2, and <i>St</i> = 4.

The Capacitive Sensing of the Pulsatile Liquid Flow—Investigation on a Physical Vascular Model

This article investigates a prospective capacitive sensing method for the measurement of physical characteristics of a pulsatile liquid flow. It was tested on a physical vascular model. The volume pulse wave sensor holds a high sensitivity and thus great potential in the field of industrial applications and also in biomedical applications where we also encounter a pulsating flow of blood. Two types of capacity sensors were developed and tested on our blood vessel model, currently used for the simulation of pulse wave propagation with the possibility of changes in vessel properties and many setups are reached for testing different pulse wave propagations. The newly developed capacitive sensor detects the capacity change of pulsating liquid flow in the vascular model. Data from the capacitive sensor are compared with two reference sensors, one for direct pressure sensing and the second for noncontact optical sensing of changes in diameter. The signal processing is used for all three types of sensors and analysis in the time and frequency domain to determine the accuracy. The use of capacitive sensors is promising since it can measure a negligible change in the diameter of the vessel in the range of tens of femtofarads (fF). We can confirm that the high precision measurement is dependent on the environment, which can cause the capacity change, but with proper shielding it can be eliminated.

Investigation of hydraulic resistance of pulsating flows of viscous fluid in elastic pipe

In recent years, flexible pipes made of synthetic polymer materials are being rapidly introduced into practice. Pulsating currents are important in driving water and other liquids in main pipes. This paper examines the pulsating currents of a viscous incompressible fluid in an elastic pipe. The necessary hydrodynamic parameters will be determined by solving the problem, such as distributions of pressure, velocity, flow rate, propagation velocity of the pressure pulse wave, and their attenuation. For the first time in this article, the decrease in hydraulic resistance in a pulsating flow through pipes due to the elasticity of the wall will be determined. The dependence of the dimensionless value of the pressure pulse wave on the vibrational numberαis studied. The pulse wave speed is compared with the speed of Moens-Korteweg, c∞and significant differences between them are found. The dependence of the reciprocal value of attenuation, related to the wavelength, on the vibrational numberαis also studied; it is shown that the attenuation is free at lower values of the Womersley vibrational parameter, practically equals zero, and at large values of which it asymptotically approaches unity [1-9].