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Journal articles on the topic 'Cylindrical pipe'

Author: Grafiati

Published: 15 June 2024

Last updated: 31 July 2025

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1

JG, Abuga. "Mathematical Modelling and Simulation of Aluminium Filling in Conical Pipe and Cylindrical Pipe under High Pressure." Physical Science & Biophysics Journal 6, no. 2 (2022): 1–7. http://dx.doi.org/10.23880/psbj-16000215.

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The desired technology for manufacturing light-weight components from metal alloys mostly aluminum and magnesium alloy is Die casting. High pressure die casting requires the liquid metal to be forced at high speed and pressure through a metal pipe. In our study, we seek to study Aluminum filling under high pressure in two different pipes, cylindrical and conical pipes. Two cases are considered for the cylindrical pipe, when the pipe vertical and when the pipe in inclined at an angle of 450 with the horizontal. The governing equations are obtained and the results are compared. The governing equ

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2

Afandiyev, Emin Musa, and Mahammadali Nuraddin Nuriyev. "ANALYSIS OF THE CONDITION OF A PIPE FIXED IN A CLAMPING DEVICE." EUREKA: Physics and Engineering, no. 1 (January 29, 2021): 78–85. http://dx.doi.org/10.21303/2461-4262.2021.001587.

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Due to the fact that clamping devices are widely used in various industries, the requirements for the operation of such devices are constantly increasing. This is due to an increase in the general requirements for processing accuracy, as well as an increase in the forces acting on the clamped part. The reliability of these devices when working with thin-walled cylindrical parts is of great importance. Thin-walled cylinders used in mechanical engineering are subject to significant loads. With prolonged exposure to loads from clamping forces, as well as from axial tensile forces, plastic d

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3

Idrus, Fairosidi, Nazri Mohamad, Ramlan Zailani, Wisnoe Wirachman, and Mohd Zulkifly Abdullah. "Experimental Model to Optimize the Design of Cylindrical Heat Pipes for Solar Collector Application." Applied Mechanics and Materials 393 (September 2013): 735–40. http://dx.doi.org/10.4028/www.scientific.net/amm.393.735.

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A heat pipe is a heat-transfer device that use the principles of thermal conductivity and phase change to transfer heat between two ends at almost constant temperature. The thermal peformance of cylindrical heat pipes depends on design parameters such as dimensions of the heat pipe, material, wick structure and the working fluid. An experimental strategy was designed to study the effect of these parameters on the thermal performance of cylindrical heat pipes. The experimental design was conceived by employing the Taguchi method. The final aim of the experiments is to come up with design parame

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4

Adachi, T., S. Ujihashi, and H. Matsumoto. "Impulsive Responses of a Circular Cylindrical Shell Subjected to Waterhammer Waves." Journal of Pressure Vessel Technology 113, no. 4 (1991): 517–23. http://dx.doi.org/10.1115/1.2928789.

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The impulsive responses of semi-finite and finite pipes filled with fluid are analyzed in order to clarify the validity of Joukowsky’s theory and the fluid-pipe coupling effect. In the analysis, Flu¨gge’s dynamic bending shell theory and the potential theory of compressible perfect fluid are used. The analytical solutions in Laplace transformed domain are obtained. The inversion of the solutions is performed numerically using the algorithm of FFT. When a pipe is fairly long, it is shown that the result of Joukowsky’s theory which has no pipe inertia effect approximately agrees with that of the

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5

Fukuda, Izumi, Yasunori Harada, and Yuichi Tanaka. "Effect of Temperature on Plastic Buckling Strength of Shot Peened Pipe of Magnesium Alloys." Materials Science Forum 654-656 (June 2010): 747–50. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.747.

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This paper deals with the effect of temperature on plastic buckling strength of cylindrical pipe of some magnesium alloys subjected to shot peening process. Workpieces are three cylindrical pipes of AZ31, AZ61 and AZ80 magnesium alloys. The shape of pipe is 30mm in height, 16mm and 14mm in outer and inner diameters. The shot peening treatment was given on the surface of cylindrical pipe using an air-type peening machine. Plastic buckling strength test was performed under axial compression in a case of both ends with fixed condition, at several temperatures between 293K and 573K and at a crossh

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6

Doi, Taiga, Takashi Futatsugi, Michio Murase, Kosuke Hayashi, Shigeo Hosokawa, and Akio Tomiyama. "Countercurrent Flow Limitation at the Junction between the Surge Line and the Pressurizer of a PWR." Science and Technology of Nuclear Installations 2012 (2012): 1–10. http://dx.doi.org/10.1155/2012/754724.

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An experimental study on countercurrent flow limitation (CCFL) in vertical pipes is carried out. Effects of upper tank geometry and water levels in the upper and lower tanks on CCFL characteristics are investigated for air-water two-phase flows at room temperature and atmospheric pressure. The following conclusions are obtained: (1) CCFL characteristics for different pipe diameters are well correlated using the Kutateladze number if the tank geometry and the water levels are the same; (2) CCFL occurs at the junction between the pipe and the upper tank both for the rectangular and cylindrical t

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7

Zinurov, V. E., A. V. Dmitriev, M. A. Ruzanova, and O. S. Dmitrieva. "Classification of bulk material from the gas flow in a device with coaxially arranged pipes." E3S Web of Conferences 193 (2020): 01056. http://dx.doi.org/10.1051/e3sconf/202019301056.

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The paper deals with the problem of classification of bulk material, based on silica gel, larger than 30 µm, from dusty gas flow. In order to solve this problem, the design of a classifier with coaxially arranged pipes is proposed. According to the conducted studies, it is more efficient to use a classifier with an inner conical pipe to solve the problems of separating the particles from the gas flows of various sizes, since a greater value is achieved for the centrifugal, inertial, gravitational and other forces acting on the dusty flow, that contribute to knocking the particles out of its st

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8

Li, Bing, Yu Lan Wei, Dan Zhang, and Qing Huang. "Influence of Lumped Mass on the Natural Frequency of Cylindrical Pipe." Advanced Materials Research 532-533 (June 2012): 403–7. http://dx.doi.org/10.4028/www.scientific.net/amr.532-533.403.

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The lumped mass on the cylindrical pipe affects the natural frequency of the cylindrical pipe. The first-three order natural frequencies and vibration modes of the cylindrical pipe with different lumped masses are analyzed by the bending vibration theory and finite element analysis, respectively. The results with different lumped masses are obtained by experiments. As shown in the results, the natural frequencies of the cylindrical pipe with lumped mass are lower than those without lumped mass. The greater the lumped mass is, the smaller the natural frequencies of the pipe are.

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9

Kim, Jae-Hee, Jae-Cheol Lee, and You-Rack Choi. "PiROB: Vision-based pipe-climbing robot for spray-pipe inspection in nuclear plants." International Journal of Advanced Robotic Systems 15, no. 6 (2018): 172988141881797. http://dx.doi.org/10.1177/1729881418817974.

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Among many pipes in a nuclear power plant, the spray pipes in the reactor building are one of the most important pipes in view of their function and safety aspects. However, it is very difficult to manually reach and inspect the pipes for defects or damage, because these pipes are installed in very high places. To carry out this kind of inspection more easily, we developed a mobile robot to climb up and down and to cross over such pipes. A mobile robot should be small and light enough that it can be practically and safely operated in a nuclear power plant. Our robot is able to overcome obstacl

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10

Li, Bing, Yu Lan Wei, Qi Bo Yan, and Yue Zhan Wang. "Vibration Characteristics of a Containing Liquid Cylindrical Pipe with Lumped Mass." Applied Mechanics and Materials 184-185 (June 2012): 641–44. http://dx.doi.org/10.4028/www.scientific.net/amm.184-185.641.

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The liquid within a cylindrical pipe affects the vibration characteristics of the pipe. Furthermore, these vibration characteristics are affected by lumped mass on the pipe. The natural frequencies and the vibration modes of the cylindrical pipe with different lumped masses can be obtained by finite element analysis. The natural frequencies of the containing liquid cylindrical pipe are obtained by experiments. The experimental results show that the natural frequencies of the containing liquid pipe are affected by the lumped mass. The greater the lumped mass is, the smaller the natural frequenc

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11

JG, Abuga. "Analysis of Aluminium Filling in Cylindrical Pipe under High Pressure by Experiment and Mathematical Modelling." Physical Science & Biophysics Journal 7, no. 1 (2023): 1–9. http://dx.doi.org/10.23880/psbj-16000236.

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The preferred method for producing lightweight metal components, mainly from aluminum and magnesium alloys, is through high pressure die casting. This process involves rapidly and forcibly injecting liquid metal into a metal mold under high pressure. Our study aims to compare results obtained from the numerical modelling of the filling of aluminum under high pressure with the experimental results. Two different cylindrical pipes are used. The results indicate for imposed values of KE = 14 and KW = 60 for pipe 1(Dentry/Drp=40/40) and pipe 2 (Dentry/Drp=16/40) respectively, the mathematical mode

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12

Doubrovsky, Michael, Liudmyla Kusik, and Vladyslava Dubravina. "Pipe pile with internal diaphragm as effective bearing element of deep-water structures." Herald of the Odessa National Maritime University, no. 72 (March 24, 2024): 16–29. http://dx.doi.org/10.47049/2226-1893-2024-16-29.

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One of the ways to reduce piling expenses is decreasing volume of piling works. It can be provided by shortening either the piles length or the number of pipes. These results may be achieved if each short-cut pile is improved and bears the same loading as a pile of normal length or if each pile of normal length is improved and bears larger axial force in comparison with its initially designed capacity. Presented study clarified possibilities to regulate the pipe pile’s bearing capacity using an internal rigid diaphragm (closure) placed inside the pile’s shaft. It increases the bearing capacity

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13

Maleki, I., and O. Rahmani. "A closed-form solution for the bending analysis of composite sandwich pipe with compliance core based on high-order sandwich theory." Journal of Sandwich Structures & Materials 22, no. 6 (2018): 1786–811. http://dx.doi.org/10.1177/1099636218789622.

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In this paper, bending of cylindrical sandwich pipes based on the high-order theory of sandwich structures with flexible core is investigated. The cylindrical sandwich pipe is composed of a flexible core and two composite face sheets. Behavior of the cylindrical sandwich pipe is described by a high-order sandwich shell theory, which explains nonlinear distortions of cross-sectional plane of the flexible core as well as changes in its height. The theory based on variational principles and using an extremely thorough systematic closed-form approach is formulated. In this model, no assumption has

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14

Suminar, Dian Ratna, and Nurcahyo Nurcahyo. "Karakteristik Hydrocyclone untuk Pemisahan Minyak dan Air." Jurnal Teknik Kimia dan Lingkungan 4, no. 2 (2020): 133. http://dx.doi.org/10.33795/jtkl.v4i2.160.

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Eksplorasi minyak bumi dari sumur-sumur yang sudah tua menghasilkan minyak dengan kandungan air tinggi. Hydrocyclone suatu alat yang berfungsi untuk pemisahan cair-cair berdasarkan perbedaan berat jenis setiap komponen. Pemisahan ini terjadi dikarenanakan adanya gaya sentrifugal dan gaya gravitasi yang dihasilkan dari bentuk hydrocyclone yang seperti kerucut. Perancangan dan pembuatan hydrocyclone menghasilkan alat dengan spesifikasi sebagai berikut : diameter pipa masukan : 25,4 mm, diameter cylindrical section : 120 mm, tinggi cylindrical section : 120 mm, tinggi cone section : 600 mm, diame

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15

Cao, Y., and A. Faghri. "Transient Multidimensional Analysis of Nonconventional Heat Pipes With Uniform and Nonuniform Heat Distributions." Journal of Heat Transfer 113, no. 4 (1991): 995–1002. http://dx.doi.org/10.1115/1.2911233.

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A numerical analysis of transient heat pipe performance including nonconventional heat pipes with nonuniform heat distributions is presented. A body-fitted grid system was applied to a three-dimensional wall and wick model, which was coupled with a transient compressible quasi-one-dimensional vapor flow model. The numerical results were first compared with experimental data from cylindrical heat pipes with good agreement. Numerical calculations were then made for a leading edge heat pipe with localized high heat fluxes. Performance characteristics different from conventional heat pipes are ill

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16

Emin, Musa Afandiyev, and Nuraddin Nuriyev Mahamadali. "IMPROVING THE RETENTION CAPACITY OF CLAMPING ELEMENTS." Eastern-European Journal of Enterprise Technologies 1, no. 1 (103) (2020): 47–51. https://doi.org/10.15587/1729-4061.2020.195193.

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An analysis of the discarded drill pipes that had been used in wedge grips has revealed that the main reason for pipe rejection is the reduction of a pipe wall as a result of plastic deformations, due to damaging the pipe surface by the die teeth. The long-term exposure to loads results in the plastic deformations of cylindrical parts, which could lead to unacceptable damage and distortion of the shape. In the oil industry, when drilling and casing pipes are clamped, stresses over some areas in the capture zone exceed the fluidity limit. Multiple clamps of the pipe could reduce the wall of the

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17

Vladimir, Marinenko, та Kulynych Vladyslav. "DEVELOPMENT OF A SOLAR COLLEСTOR BASED ON ALUMINUM CONSTRUCTION HEAT PIPES". Technology audit and production reserves 6, № 1 (50) (2019): 42–46. https://doi.org/10.15587/2312-8372.2019.190119.

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<em>The object of research is the thermal efficiency of solar collectors based on aluminum structural heat pipes. Solar collectors with heat pipes have a structurally similar design. The heat-absorbing panel secures the heat pipes to the evaporation zone, and the condensation zones are located in the battery tank. The differences are only in the designs of the absorption panels, the areas of the condensation zones and the heat carriers of the heat pipes. One of the most problematic places of research is the justification and development of a new design of a heat-absorbing solar collector panel

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18

Zengel, Keith, Lauren Boehnert, Jared Medina, et al. "Eddy currents of a magnet falling through a copper pipe with slits." American Journal of Physics 93, no. 3 (2025): 223–33. https://doi.org/10.1119/5.0216717.

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We present a theoretical model for the eddy currents induced by a cylindrical magnet falling through a copper pipe with vertical slits and the resulting inductive drag force. This system maintains the mathematically convenient cylindrical geometry of the classic intact pipe problem while introducing boundary conditions that result in fascinating eddy current patterns. Previous experiments have demonstrated that the inductive drag force is smaller in a slit pipe than in an intact pipe of the same radius, suggesting that the presence of slits reduces but does not eliminate the horizontal induced

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19

Celik, Metin, Geert Paulussen, Dennis van Erp, Wiebren de Jong, and Bendiks Boe. "Transient Modelling of Rotating and Stationary Cylindrical Heat Pipes: An Engineering Model." Energies 11, no. 12 (2018): 3458. http://dx.doi.org/10.3390/en11123458.

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Rotating wickless and stationary capillary cylindrical heat pipes are widely used heat transfer devices. Transient behavior of such heat pipes has been investigated numerically with computational fluid dynamics and lumped parameter models. In this paper, the advantages of both methods are combined into a novel engineering model that is low in computational cost but still accurate and rich in the details it provides. The model describes the interior dynamics of the heat pipe with a 2D representation of a cylindrical heat pipe. Liquid and vapor volumes are coarsely meshed in the axial direction.

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20

S.M.Vijayarajan. "Optimizing Heat Transfer in Nanofluid Heat Pipes Using Fuzzy Logic: A Soft Computing Approach for Human-Machine Interface Systems." Journal of Information Systems Engineering and Management 10, no. 37s (2025): 199–204. https://doi.org/10.52783/jisem.v10i37s.6394.

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Heat pipes, renowned for their efficient heat transfer capabilities, can be further enhanced by leveraging the power of nanofluids. However, optimizing their performance can be challenging due to the complex interplay between various factors. This work explores applying fuzzy logic, a powerful artificial intelligence (AI) technique, for optimizing heat transfer in cylindrical heat pipes filled with ZrO2-CeO2/Water-Ethylene Glycol (WEG) nanofluids. Heat pipes offer exceptional heat transfer capabilities due to capillary action and phase change. However, their performance can be further enhanced

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21

Gabibov, Yu S., and Kh B. Salaeya. "Investigation of individual problems of calculation of drainage pipes in complex geotechnical conditions." Construction and Geotechnics 14, no. 1 (2023): 59–73. http://dx.doi.org/10.15593/2224-9826/2023.1.05.

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The article notes that changes in the loads acting on the drainage pipe (pipeline) in accordance with the relative ability of the drainage pipe and the ground filling to deform are essential. To determine the magnitude of the loads on the drainage pipeline laid in the trench, the formula proposed by A. Marston most accurately corresponds to the results of experiments and is convenient for engineering practice. The perforation of the walls of the drainage pipe affects their strength not only when the pipes are crushed, but also for the conditions of transportation and installation of pipes. The

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22

Ebihara, Satoshi, Raiki Masui, Koki Koyama, Yuki Tsujikawa, and Yuto Nishida. "Effect of the Outer Pipe on Reducing Direct Coupling of the Thin Borehole Radar Probe in Thick Water-Filled Borehole." Remote Sensing 17, no. 1 (2024): 100. https://doi.org/10.3390/rs17010100.

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We propose an outer pipe to reduce a direct wave in a thin single-hole borehole radar probe in a thick water-filled borehole. The outer pipe replaces the medium, such as water inside the borehole, with low-permittivity materials, such as air and plastics. According to numerical calculations, the cylindrical water layer makes the direct wave from the transmitting loop antenna to the receiving one have significant power and narrow frequency bandwidth. This is caused by the low attenuation of the TE01 surface wave when there is a cylindrical water layer. The MoM analysis showed that wearing the o

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23

AHRARY, ALIREZA, LI TIAN, SEI-ICHIRO KAMATA, and MASUMI ISHIKAWA. "NAVIGATION OF AN AUTONOMOUS SEWER INSPECTION ROBOT BASED ON STEREO CAMERA IMAGES AND LASER SCANNER DATA." International Journal on Artificial Intelligence Tools 16, no. 04 (2007): 611–25. http://dx.doi.org/10.1142/s0218213007003461.

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Sewer environment is composed of cylindrical pipes, in which only a few landmarks such as manholes, inlets and pipe joints are available for localization. This paper presents a method for navigation of an autonomous sewer inspection robot in a sewer pipe system based on detection of landmarks. In this method, location of an autonomous sewer inspection robot in the sewer pipe system is estimated from stereo camera images. The laser scanner data are also used to ensure accurate localization of the landmarks and reduce the error in distance estimation by image processing. The method is implemente

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24

SUGIMATA, Etsuro, Hisai UEDA, Wataru KURIYAMA, et al. "Formability of Braided CFRTP Cylindrical Pipe in Pipe Bending." Journal of Textile Engineering 63, no. 2 (2017): 49–54. http://dx.doi.org/10.4188/jte.63.49.

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25

Tovsteleva, A. I. "Technical and economic advantages of using elongating mandrel made of forged blank when rolling on a continuous mill with a controlled‑movable mandrel." Litiyo i Metallurgiya (FOUNDRY PRODUCTION AND METALLURGY), no. 4 (December 20, 2021): 55–58. http://dx.doi.org/10.21122/1683-6065-2021-4-55-58.

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In the article, the current problem of reducing the cost of pipe‑rolling products, which is especially acute in the world market of metal products high competition conditions is considered. A significant share in the cost of pipe products stands at the cost of rolling tools. Reducing the cost of buying a deforming tool allows you to make considerable savings in the seamless pipes’ production. The article presents: analysis of the economic efficiency of manufacturing long cylindrical mandrels from a semi‑finished product – forged billet at OJSC «BSW – management company of «BMC» holding»; devel

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26

Lipnitskyi, L. V., R. S. Melnyk, Yu E. Nikolaenko, V. Yu Kravets, and D. V. Pekur. "Impact of changing the shape of gravity heat pipe with threaded evaporator on its heat transfer characteristics." Technology and design in electronic equipment, no. 1-2 (2023): 27–33. http://dx.doi.org/10.15222/tkea2023.1-2.27.

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The modern development of electronics is associated with the problem of reducing the mass and size of the equipment while increasing its power. This leads to an increase in the temperature of both individual elements and the device as a whole, which contributes to a decrease in equipment reliability. This makes the development of inexpensive yet efficient cooling systems an urgent task. One of the ways to solve this problem is to use heat pipes of a new simplified design in cooling systems. This article compares the thermal characteristics of a cylindrical copper gravity heat pipe with a threa

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27

Mishra, Dipti Prasad, and Subhash Chandra Paramanik. "Computation of Air Entrainment into a Mixing Pipe: An Experimental and Numerical Analysis." Journal of Mechanical Engineering 16, no. 2 (2019): 11–28. http://dx.doi.org/10.24191/jmeche.v16i2.15323.

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Computations of entrainment of air into a pipe were performed by placing an air jet at the bottom of the pipe. An experiment was performed with cylindrical mixing pipe having different diameter, length and jet location. A flow meter was used to measure the flow through the nozzle and velocity at the mixing pipe exit was measured by anemometer. CFD analyses were performed using Ansys-Fluent 16 to match the experimental results for exit velocity and amount of air sucked into the pipe. Further numerical investigations were performed for a mixing pipe with hot jet to estimate the amount of air ent

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28

Мірошніков, В. Ю., О. Б. Савін, М. Л. Косенко та О. О. Ільїн. "АНАЛІЗ НАПРУЖЕНОГО СТАНУ ШАРУ З ДВОМА ЦИЛІНДРИЧНИМИ ВРІЗАНИМИ ОПОРАМИ ТА ЦИЛІНДРИЧНИМИ ВТУЛКАМИ". Open Information and Computer Integrated Technologies, № 101 (9 грудня 2024): 112–26. https://doi.org/10.32620/oikit.2024.101.08.

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The spatial problem of the theory of elasticity for a layer on cylindrical embedded supports with cylindrical sleeves (thick-walled pipes) located between each support and the layer is solved. Smooth contact conditions are set at the interface between the layer and the pipes. Stresses are specified on the surfaces of the layer, and displacements are specified on the inner surface of the pipe (rigidly conjugated to the support). The analytical and numerical solution of the problem is based on the Lamé equations written for the layer and each pipe. When the boundary conditions and the conditions

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29

Hayashi, Takahiro, Koichiro Kawashima, Zongqi Sun, and Joseph L. Rose. "Guided Wave Propagation Mechanics Across a Pipe Elbow." Journal of Pressure Vessel Technology 127, no. 3 (2005): 322–27. http://dx.doi.org/10.1115/1.1990210.

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Wave propagation across a pipe elbow region is complex. Subsequent reflected and transmitted waves are largely deformed due to mode conversions at the elbow. This prevents us to date from applying guided waves to the nondestructive evaluation of meandering pipeworks. Since theoretical development of guided wave propagation in a pipe is difficult, numerical modeling techniques are useful. We have introduced a semianalytical finite element method, a special modeling technique for guided wave propagation, because ordinary finite element methods require extremely long computational times and memor

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Saktioto, Saktioto, Agam Muhammad Maulana, Preecha Yupapin, and Haryana Mohd Hairi. "Analysis of fluid flow in a cylindrical tube using fiber Bragg grating." Science, Technology and Communication Journal 4, no. 1 (2023): 15–20. http://dx.doi.org/10.59190/stc.v4i1.253.

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Fiber Bragg grating (FBG) is an optical sensor component that has better performance than other optical and electronic components. FBG has a very high sensitivity to changes in temperature and strain, is small in size, and is resistant to electromagnetic wave interference and multiplexing. In this study, FBG is used to monitor the fluid flow rate in a pipe by analyzing changes in the output power generated by the FBG. This research was designed by varying the pipe diameter, measurement position, and fluid flow rate. The diameters of the pipes used are 5.95, 7.01, 8.79, and 10.32 mm. The fluid

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31

Wei, Yu Lan, Bing Li, Li Gao, and Ying Jun Dai. "Vibration Response of a Thin-Walled Cylindrical Pipe with Liquid." Applied Mechanics and Materials 189 (July 2012): 345–49. http://dx.doi.org/10.4028/www.scientific.net/amm.189.345.

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Vibration characteristics of the thin-walled cylindrical pipe are affected by the liquid within the pipe. The natural frequencies and vibration modes of the pipe without liquid are analyzed by the theory of beam bending vibration and finite element model, which is based on the Timoshenko beam model. The first three natural frequencies and vibration modes of the pipe with or without liquid are acquired by experiments. As shown in the experiment results, the natural frequencies of the containing liquid pipe are lower than the natural frequencies of the pipe without liquid.

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Suciu, Barenten. "Evaluation of the Damping Produced by the Motion of a Permanent Magnet inside of a Conductive Pipe." European Journal of Engineering and Technology Research 9, no. 1 (2024): 16–22. http://dx.doi.org/10.24018/ejeng.2024.9.1.3126.

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In this study, a method to evaluate the electro-magnetic damping effect produced by the movement of a permanent magnet inside of a conductive pipe, is proposed. Neither the residual flux density of the magnet, nor the electric conductivity of the pipe is required, but instead, only the magnet height, the pipe length, and the falling time of the magnet inside the tube, are necessary to compute the damping coefficient. Accordingly, cylindrical neodymium magnets of close residual flux densities, but various diameters and heights, are tested against copper pipes of various thicknesses. Using the f

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33

Ristic, Slavica, Jelena Ilic, Djordje Cantrak, Ognjen Ristic, and Novica Jankovic. "Estimation of laser-Doppler anemometry measuring volume displacement in cylindrical pipe flow." Thermal Science 16, no. 4 (2012): 1027–42. http://dx.doi.org/10.2298/tsci1204027r.

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Laser-Doppler anemometry application in measurements of the 3-D swirl turbulent flow velocity in the cylindrical pipe, behind the axial fan, have been analysed. This paper presents a brief overview of uncertainty sources in the laser-Doppler anemometry measurements. Special attention is paid to estimation of laser-Doppler anemometry measuring volume positioning in cylindrical pipe flow due to optical aberrations, caused by the pipe wall curvature. The hypothesis, that in the central part of the pipe (r/R < 0.6) exists a small, or negligible pipe wall influence on laser- -Doppler anemometry

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34

Towfighi, S., T. Kundu, and M. Ehsani. "Elastic Wave Propagation in Circumferential Direction in Anisotropic Cylindrical Curved Plates." Journal of Applied Mechanics 69, no. 3 (2002): 283–91. http://dx.doi.org/10.1115/1.1464872.

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Ultrasonic nondestructive inspection of large-diameter pipes is important for health monitoring of ailing infrastructure. Longitudinal stress-corrosion cracks are detected more efficiently by inducing circumferential waves; hence, the study of elastic wave propagation in the circumferential direction in a pipe wall is essential. The current state of knowledge lacks a complete solution of this problem. Only when the pipe material is isotropic a solution of the wave propagation problem in the circumferential direction exists. Ultrasonic inspections of reinforced concrete pipes and pipes retrofit

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DUGUET, Y., A. P. WILLIS, and R. R. KERSWELL. "Slug genesis in cylindrical pipe flow." Journal of Fluid Mechanics 663 (October 5, 2010): 180–208. http://dx.doi.org/10.1017/s0022112010003435.

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Transition to uniform turbulence in cylindrical pipe flow occurs experimentally via the spatial expansion of isolated coherent structures called ‘slugs’, triggered by localized finite-amplitude disturbances. We study this process numerically by examining the preferred route in phase space through which a critical disturbance initiates a ‘slug’. This entails first identifying the relative attractor – ‘edge state’ – on the laminar–turbulent boundary in a long pipe and then studying the dynamics along its low-dimensional unstable manifold, leading to the turbulent state. Even though the fully tur

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Bai, Xiao Lan, and Yu Zhang. "Engineering Rules-Based Orthogonal and Variable-Steps Pipe Routing Algorithm for Aero-Engines." Advanced Materials Research 442 (January 2012): 104–8. http://dx.doi.org/10.4028/www.scientific.net/amr.442.104.

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Pipe routing is to design the routes for pipes in 3D space, meeting various constraints and engineering rules. This paper proposes the engineering rules-based orthogonal and variable-steps pipe routing algorithm. Firstly, the cylindrical coordinate system was adopted to describe the layout space and obstacles. In view of two endpoints of the pipe and obstacles in between, the local searching space was built. Then, the searching algorithm was given according to engineering rules, which was involved with the orthogonal searching directions and their order, the searching variable-steps. Moreover,

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B. I., Obi, Okorie S. I., and Nlemigwe J. C. "Semi-Analytical Solution of Natural Convection Flow of Non-Newtonian Fluid With Temperature-Dependent Viscosity In Pipe." International Journal for Research in Applied Science and Engineering Technology 11, no. 9 (2023): 782–86. http://dx.doi.org/10.22214/ijraset.2023.55618.

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Abstract: This paper presents semi-analytical solution of natural convection flow of non-newtonian fluid with temperaturedependent viscosity in pipe. The governing equations were solved using perturbation technique. The results obtained were analyzed for various thermo-solutal parameters involved in the dimensionless equations. Results within the constant viscosity show that increase in these parameters increases the velocity of the fluid flow as well as the temperature of the cylindrical pipe. It is observed that increase in the Reynold’s viscosity indices increases the temperature of the cyl

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Xiang, Jianhua, Xi-bo Chen, Jiale Huang, Chunliang Zhang, Chao Zhou, and Haoxing Zheng. "Thermal Performances Investigation of Anti-Gravity Heat Pipe with Tapering Phase-Change Chamber." Energies 13, no. 19 (2020): 5036. http://dx.doi.org/10.3390/en13195036.

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The objective of this study was to fabricate anti-gravity heat pipes with a tapering column phase-change chamber and changeable cross-sectional wick structure. The thermal performances of the anti-gravity heat pipes were experimentally investigated. Results show that the thermal resistances of the different heat pipes are less than 0.03 °C/W, except for the sharp conical chamber heat pipe under anti-gravity heating conditions (0.121 °C/W). Start-up times of different types of heat pipes are similar and the temperatures are steady within 3 to 5 min. The heat transfer ability of a conical chambe

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Shevchenko, Nataliya, Vladyslav Kaliuzhnyi, and Viktoriia Andriievska. "NUMERICAL SIMULATION OF PROCESS FLUID FLOW IN THE PIPES OF A COILED TUBING INSTALLATION." Bulletin of the National Technical University "KhPI". Series: Hydraulic machines and hydraulic units, no. 1 (October 10, 2023): 60–65. http://dx.doi.org/10.20998/2411-3441.2023.1.10.

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Today, one of the modern trends is the use of coiled tubing technologies and improvement of the composition of washing agents (liquids). The features of coiled tubing technological sections are considered – spiral pipe laying, the ratio of the main dimensions of flexible pipes, drum and guide sector. The presence of a pipe conveyor gives special responsibility for ensuring the movement of a string of flexible pipes within a given load range. The length of the pipes reaches 5000 m. The radial dimensions of the well are 150 mm. The stages of determining the main parameters of a pumping unit for

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Idrus, Fairosidi, Nazri Mohamad, Ramlan Zailani, Wirachman Wisnoe, and Mohd Zulkifly Abdullah. "Thermal Performance of a Cylindrical Heat Pipe for Different Heat Inputs and Inclination Angles." Applied Mechanics and Materials 661 (October 2014): 148–53. http://dx.doi.org/10.4028/www.scientific.net/amm.661.148.

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An experimental study on thermal performance of a copper heat pipe operated with sintered powder wick has been performed. A miniature cylindrical heat pipe with small outer diameter, Ø10 mm and 300 mm in length, has been chosen in the study. An attempt is also made to design, fabricate and assemble a heat pipe test rig to be used for the experiment. The performance of the heat pipe is investigated at various heat inputs and inclination angles (orientations). The aim of this study is to evaluate and compare the thermal performance of the heat pipe based on temperature differential between the e

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. Sahu, S. R., and D. P. Mishra*. "Effect of Pipe Configurations on Air Entrainment into a Louvered Cylindrical Pipe: A Comparison between Open and Close Entrance of a Pipe." International Journal of Engineering Research 4, no. 4 (2015): 173–77. http://dx.doi.org/10.17950/ijer/v4s4/402.

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Hambric, Stephen. "Practical Tutorial on cylindrical structure vibro-acoustics Part 1 - Vibrations." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 7 (2023): 140–49. http://dx.doi.org/10.3397/in_2022_0026.

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The mathematics which describe the vibroacoustic behavior of cylindrical structures are imposing to say the least. Part 1 of this practical tutorial demystifies cylindrical shell vibration theory by using measured data from actual shells and pipes to explain key concepts. For any shell, you can estimate frequency ranges where shells behave like simple beams and flat plates, greatly simplifying calculations of modes of vibration and mobilities. The key is first calculating the ring frequency - the frequency where membrane waves can propagate fully around the shell circumference. Simple infinite

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Alves dos Santos Júnior, Valdecir, Severino Rodrigues de Farias Neto, Antonio Gilson Barbosa de Lima, et al. "Heavy Oil Laminar Flow in Corrugated Ducts: A Numerical Study Using the Galerkin-Based Integral Method." Energies 13, no. 6 (2020): 1363. http://dx.doi.org/10.3390/en13061363.

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Fluid flow in pipes plays an important role in different areas of academia and industry. Due to the importance of this kind of flow, several studies have involved circular cylindrical pipes. This paper aims to study fully developed internal laminar flow through a corrugated cylindrical duct, using the Galerkin-based integral method. As an application, we present a study using heavy oil with a relative density of 0.9648 (14.6 °API) and temperature-dependent viscosities ranging from 1715 to 13000 cP. Results for different fluid dynamics parameters, such as the Fanning friction factor, Reynolds n

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Litvintceva, A. A., N. I. Volkov, N. I. Vorogushina, V. A. Moskovskikh, and V. V. Cheverda. "The effect of operating parameters on the heat transfer in the heat pipe." Journal of Physics: Conference Series 2119, no. 1 (2021): 012088. http://dx.doi.org/10.1088/1742-6596/2119/1/012088.

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Abstract Heat pipes are a good solution for temperature stabilization, for example, of microelectronics, because these kinds of systems are without any moving parts. Experimental research of the effect of operating parameters on the heat transfer in a cylindrical heat pipe has been conducted. The effect of the working fluid properties and the porous layer thickness on the heat flux and temperature difference in the heat pipe has been investigated. The temperature field of the heat pipe has been investigated using the IR-camera and K-type thermocouples. The data obtained by IR-camera and K-type

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Guerra, Edmundo, Rodrigo Munguía, Yolanda Bolea, and Antoni Grau. "Detection and Positioning of Pipes and Columns with Autonomous Multicopter Drones." Mathematical Problems in Engineering 2018 (June 21, 2018): 1–13. http://dx.doi.org/10.1155/2018/2758021.

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A multimodal sensory array to accurately position aerial multicopter drones with respect to pipes has been studied, and a solution exploiting both LiDAR and vision sensors has been proposed. Several challenges, including detection of pipes and other cylindrical elements in sensor space and validation of the elements detected, have been studied. A probabilistic parametric method has been applied to segment and position cylinders with LIDAR, while several vision-based techniques have been tested to find the contours of the pipe, combined with conic estimation cylinder pose recovery. Multiple sol

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Li, Bo, Meng-Xiong Tang, He-Song Hu, et al. "Theoretical Analysis of Drilling Unloading and Pile-Side Soil Pressure Recovery of Nonsqueezing Pipe Piles Installed in K0-Consolidated Soils." Buildings 14, no. 6 (2024): 1670. http://dx.doi.org/10.3390/buildings14061670.

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Drilling with prestressed concrete (DPC) pipe pile is a nonsqueezing pile sinking technology, employing drilling, simultaneous pile sinking, a pipe pile protection wall, and pile side grouting. The unloading induced by drilling, the pipe pile supporting effect, and the dissipation of the negative excess pore-water pressure after pile sinking, all of which have significant effects on the recovery of soil pressure on the pile side, are the main concerns of this study, which aim to establish a method to reasonably evaluate the timing selection of pile side grouting. The theoretical solutions for

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Na, Won-Bae, and Tribikram Kundu. "EMAT-Based Inspection of Concrete-Filled Steel Pipes for Internal Voids and Inclusions." Journal of Pressure Vessel Technology 124, no. 3 (2002): 265–72. http://dx.doi.org/10.1115/1.1491271.

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Concrete-filled steel pipes have been used as piles for supporting civil and marine structures. These piles provide good bending resistance, and can be easily spliced for long depth installation. However, these piles are usually exposed in hostile environments such as seawater and deicing materials. Thus, the outside corrosion of the steel pipe can reduce the wall thickness and the corrosion-induced delamination of internal concrete can increase internal volume or pressure. In addition, the void that can possibly exist in the pipe reduces the bending resistance. To avoid structural failure due

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Trubayev, Oleksandr, and Andrew Larin. "On the modeling of boundary conditions for determining the critical speeds of rotation of rotors." Bulletin of the National Technical University «KhPI» Series: Dynamics and Strength of Machines, no. 2 (December 31, 2022): 56–60. http://dx.doi.org/10.20998/2078-9130.2022.2.270867.

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The article is devoted to the definition of boundary conditions that allow achieving adequate results when calculating the critical speeds of rotation of rotors based on finite element models. Experimental determination of the frequencies of free vibrations of a laboratory rotor on ball bearings was carried out using a vibration measuring complex developed by the authors. Numerical studies of the free vibrations of a laboratory rotor and a cylindrical pipe with a wall thickness to length ratio of 1/10 were performed on the basis of a three-dimensional finite element model under various boundar

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Burkitbayev, Arman, Delika M. Weragoda, Francesco Ciampa, Kin Hing Lo, and Guohong Tian. "A Numerical and Experimental Investigation on a Gravity-Assisted Heat-Pipe-Based Battery Thermal Management System for a Cylindrical Battery." Batteries 9, no. 9 (2023): 456. http://dx.doi.org/10.3390/batteries9090456.

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A thermal management system for lithium-ion batteries is an essential requirement for electric vehicle operation due to the large amount of heat generated by these cylindrical batteries during fast charging/discharging. Previously, researchers have focused mostly on pouch and prismatic cells with heat pipes arranged in the horizontal direction. The current study introduces a novel vertically-oriented heat-pipe-based hybrid cooling battery thermal management system (BTMS) that numerically evaluates the thermal performance of the cylindrical batteries and the flow pattern within the cooling chan

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Bannikov, Alexander I., Vasilisa I. Alekseychuk, Olga A. Makarova, and Nikolay A. Dyatlov. "The Quality of a Surface Received by Processing the End of a Large Diameter Pipe with the Use of a Single-Row Cylindrical Brush." Materials Science Forum 973 (November 2019): 75–79. http://dx.doi.org/10.4028/www.scientific.net/msf.973.75.

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In this article we study the received quality of a welded large-diameter pipe after the processing by a single-row cylindrical brush. The speed of the brush influences the roughness of the pipe surface.

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