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Journal articles on the topic 'Sheet tube'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Xu, Jun Feng, and Jian Ping Ye. "Structure Analysis on Tube-Sheets and Heat-Transfer Tubes of PWR Steam Generator." Advanced Materials Research 461 (February 2012): 421–24. http://dx.doi.org/10.4028/www.scientific.net/amr.461.421.

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The heat-transfer tubes and tube-sheets are the most complicated pressure parts in PWR steam generator. For analyzing the stress of heat-transfer tubes and tube-sheets, the geometry model of heat-transfer tubes and tube-sheet was constructed. The finite element grids were generated by ANSYS. According to operating temperature, the temperature field and temperature stress were calculated with ANSYS. The results show that the maximum stress is located on the inner wall of juncture of heat-transfer tubes and tube-sheet. According to the operating conditions of heat-transfer tubes and tube-sheet,

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2

Alves, Luis M., Rafael M. Afonso, and Paulo A. F. Martins. "New Joining Concepts for Self-Pierce Riveting." Key Engineering Materials 883 (April 2021): 119–26. http://dx.doi.org/10.4028/www.scientific.net/kem.883.119.

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This paper is focused on innovative self-pierce riveting concepts to produce invisible joints in sheet-sheet and tube-sheet connections. The common element to these two different types of joints is the use of tubular rivets with chamfered ends, which are accessories in the case of sheet-sheet joints and constitutive (structural) elements in the case of tube-sheet joints. The presentation draws from the deformation mechanics of double-sided self-pierce riveting for producing lap joints in overlapped sheets to the development of self-pierce riveting of tubes to sheets, which is a new joining by

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3

Alves, Luis M., Rafael M. Afonso, Carlos M. A. Silva, and Paulo A. F. Martins. "Joining by Forming of Tubes to Sheets with Counterbored Holes." Key Engineering Materials 767 (April 2018): 421–28. http://dx.doi.org/10.4028/www.scientific.net/kem.767.421.

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This paper presents a new joining by forming process for connecting tubes to sheets. The process consists of forming an annular flange with rectangular cross section by partial sheet-bulk of the tube wall thickness and performing the mechanical interlock by upsetting the free tube end against a flat-bottomed (counterbored) sheet hole. The presentation identifies the variables and the workability limits of the process and includes an analytical model to assist readers in the design of the new joints. The new proposed joining by forming process and the corresponding analytical model are validate

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4

Apte, G. D. "Tube To Tube Sheet Welds." Indian Welding Journal 26, no. 2 (1993): 12. http://dx.doi.org/10.22486/iwj.v26i2.148272.

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5

Cheng, C. Z., and G. S. Choe. "Formation of Thin Current Sheets in the Solar Atmosphere." International Astronomical Union Colloquium 167 (1998): 115–18. http://dx.doi.org/10.1017/s0252921100047400.

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AbstractIn a two-dimensional quadrupolar magnetic field geometry, it is demonstrated that various magnetohydrostatic equilibrium field configurations containing current sheets can be formed either by changes in thermal properties or by footpoint displacement. The shape of current sheets depends on the mass distribution in flux tubes. If the mass per flux tube is maximum at the center of the low-lying bipolar arcades, a current sheet is formed between these two arcades along the separatrix line as the plasma temperature (or the shearing footpoint displacement) is increased above a critical valu

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6

Tokarev, Andrey Sergeevich, Denis Vladimirovich Karetnikov, Rif Garifovich Rizvanov, Ayrat Minnulovich Fayrushin, and Mars Zul'fatovich Zaripov. "Assessment of the Stress-Strain State of a Tube Sheet of the Heat Exchanger at Rotary Friction Welding Application." Materials Science Forum 991 (May 2020): 70–76. http://dx.doi.org/10.4028/www.scientific.net/msf.991.70.

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The aim of the study described in this paper is to assess the effect of forces acting on the tube sheet during friction welding on the stress-strain state of the tube sheet.For this, we calculated the stresses and displacements arising in the tube sheet during friction welding. The calculations were carried out in the ANSYS (finite element analysis software package). To carry out the calculations, solid-state models of tube sheets with diameters of 400, 600, 800, 1000, 1200, 1400 mm and thicknesses of 30, 40, 50, 60, 70 mm were created. The diameter of the holes for the heat exchange tubes was

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7

Alves, Luis M., Rafael M. Afonso, Frederico L. R. Silva, and Paulo A. F. Martins. "Deformation-Assisted Joining of Sheets to Tubes by Annular Sheet Squeezing." Materials 12, no. 23 (2019): 3909. http://dx.doi.org/10.3390/ma12233909.

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This paper is built upon the deformation-assisted joining of sheets to tubes, away from the tube ends, by means of a new process developed by the authors. The process is based on mechanical joining by means of form-fit joints that are obtained by annular squeezing (compression) of the sheet surfaces adjacent to the tubes. The concept is different from the fixing of sheets to tubes by applying direct loading on the tubes, as is currently done in existing deformation-assisted joining solutions. The process is carried out at room temperature and its development is a contribution towards ecologica

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8

Alves, Luis M., Tiago J. Reis, Rafael M. Afonso, and Paulo A. F. Martins. "Single-Stroke Attachment of Sheets to Tube Ends Made from Dissimilar Materials." Materials 14, no. 4 (2021): 815. http://dx.doi.org/10.3390/ma14040815.

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This paper presents a new joining method by a forming process for attaching sheets to tube ends. The process consists of two different forming stages carried out sequentially in a single stroke. Firstly, the free tube end is flared by compression with a contoured die, then is squeezed (indented) against the sheet surface to create a mechanical interlocking. The new process is carried out at an ambient temperature and, in contrast to existing joining by forming operations based on tube expansion, it avoids seal welds, tube protrusions above the sheet surfaces, and machining of grooves on the sh

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9

Geiger, Manfred, Marion Merklein, and Massimo Cojutti. "Integrated Tube and Double Sheet Hydroforming Technology - Optimised Process for the Production of a Complex Part." Key Engineering Materials 344 (July 2007): 477–84. http://dx.doi.org/10.4028/www.scientific.net/kem.344.477.

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The possibility to produce lightweight components with a complex geometry enhanced, in the last decades, the industrial application of the tube hydroforming and, more recently and restricted to specific industrial fields, of the sheet hydroforming technology. The integration in one tool of a tube and a double sheet hydroforming process represents an innovative technology which further emphasises the advantages offered by hydroforming in terms of costs reduction and complexity of the manufactured part. This paper describes the design and the construction of a complex hollow part resulting from

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10

Er, Berfin, and Taylan M. Daş. "COMPARISON OF ORBITAL AND MANUAL WELDING FOR MANUFACTURING STAINLESS STEEL HEAT EXCHANGER." International Journal of Advanced Natural Sciences and Engineering Researches 7, no. 6 (2023): 358–62. http://dx.doi.org/10.59287/ijanser.1173.

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The main purpose of this study, the fabrication of tube-to-tube sheet welds ofan acid cooler exchanger, which is produced with stainless steel material, was examined usingdifferent welding methods. The tubes were subjected to two different welding methods usinga tungsten electrode. In orbital welding, the machine places the tube on a mandrel andautomatically performs the welding based on the manually inputted tube diameter. At the endof each tube weld, the mandrel is transferred to the next tube by the welder. In manualwelding, the entire tube-to-tube sheet weld is performed by the welder. Wel

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11

Liu, Zun Chao, Ke Wang, Tong Liu, Wei Feng Xu, and Min Shan Liu. "Structural Analysis and Optimization of Transition Section of Convex Tube Sheet." Applied Mechanics and Materials 853 (September 2016): 356–60. http://dx.doi.org/10.4028/www.scientific.net/amm.853.356.

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The convex tube sheet which is used in heat recovery boiler consists of three parts: the high temperature tube sheet, the low temperature tube sheet and the transition section.Three-dimensional finite element model of convex tube sheet in new type of heat recovery boiler is established in this paper. Using the ANSYS Workbench software, thermal stress of the convex tube sheet is analyzed. The temperature fields and thermal stress distribution of convex tube sheet are obtained, and its structure strength is checked. The effects of the high temperature tube sheet thickness, low temperature tube s

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12

El-Batahgy, A., M. Amin, and G. Fathy. "Failure of a Column Reboiler in a MEG Recovery Unit." Materials Performance 47, no. 8 (2008): 66–69. https://doi.org/10.5006/mp2008_47_8-66.

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After only seven months of operation, a column reboiler in a mono-ethylene glycol recycling unit at a natural gas production plant failed because of localized corrosion on the portion of the tubes in the tube sheet. This attack was caused by abnormal clearance between the tubes and tube sheet, due to poor manufacturing quality, which allowed deposits to collect and initiate crevice corrosion.

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13

Wang, Ke, Wei Feng Xu, Zun Chao Liu, and Min Shan Liu. "Stress Analysis for Clad Steel Tube Sheet with Oval Tube Hole." Applied Mechanics and Materials 853 (September 2016): 296–300. http://dx.doi.org/10.4028/www.scientific.net/amm.853.296.

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Models are established for oval tube hole clad steel tube sheet and circular tube hole clad steel tube sheet. Finite element analysis software ANSYS Workbench is used. Stress distribution characteristics of tube sheet with oval tube hole are investigated. Stress distribution characteristics under different ellipticity are analyzed and the general law of stress distribution of oval tube hole clad steel tube sheet is summarized. Results show: effects of tube hole shape on stress of clad steel tube sheet mainly focus in the tube zone, oval tube hole could effectively improve the phenomenon of str

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14

Porter, Michael A., Dennis H. Martens, Thomas Duffy, and Sean McGuffie. "High-Temperature Heat Exchanger Tube-Sheet Assembly Investigation With Computational Fluid Dynamics." Journal of Pressure Vessel Technology 129, no. 2 (2006): 313–15. http://dx.doi.org/10.1115/1.2716436.

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Many modern sulfur recovery unit process waste heat recovery exchangers operate in high-temperature environments. These exchangers are associated with the thermal reactor system where the tube-sheet–tube-ferrule assemblies are exposed to gasses at temperatures approaching 3000°F. Because sulfur compounds are present in the process gas, the carbon steel tube sheet and tubes in the assembly will be deteriorated by sulfidation as the operating metal temperature rises above 600°F. Ferrule systems are used to protect the carbon steel from exposure to excessive temperatures. The temperature distribu

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15

Alves, Luis M., Rafael M. Afonso, and Paulo AF Martins. "Joining by forming of polymer-metal sheet-tube connections." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 234, no. 7 (2020): 938–46. http://dx.doi.org/10.1177/1464420720919871.

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This paper focuses on the mechanical joining of sheets to tubes made from dissimilar materials. The objective is to investigate the applicability of deformation-assisted joining by annular sheet squeezing to hybrid polymer-metal connections in order to understand how this new process can be used as an alternative to conventional fastening and adhesive bonding. The presentation draws from identification of the main operating parameters and modes of deformation to characterisation of the process workability limits. Selected test cases retrieved from experimentation and finite element simulation

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16

Tian, Jiayue, Luyao Liu, Kang Zhou, et al. "Metal–organic tube or layered assembly: reversible sheet-to-tube transformation and adaptive recognition." Chemical Science 11, no. 36 (2020): 9818–26. http://dx.doi.org/10.1039/d0sc01176b.

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A new strategy for preparing metal–organic tubes with reversible sheet-to-tube transformation character has been developed. The new-formed tube can selectively recognize and separate guest molecules with similar size.

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17

Afonso, Rafael M., and Luís M. Alves. "Tube Joining by a Sheet Flange Connection." Journal of Manufacturing and Materials Processing 7, no. 1 (2022): 12. http://dx.doi.org/10.3390/jmmp7010012.

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Joining of tubes to tubes by means of plastic deformation at ambient temperature allows one to solve the main limitations produced by the necessity of joining thin-walled tubes of low-to-medium diameter size made from materials that are not suitable to be welded and/or have reduced contact interfaces. The new joining solution allows one to obtain permanent mechanical joints of tubes or pipes by means of an accessory lightweight sheet metal flange subjected to annular indentation and subsequent injection of its material towards the tube walls to produce a mechanical interlock between the differ

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18

Singh, Km Jyoti, and Sateesh Gedupudi. "A numerical and experimental study of breakdown of falling film on horizontal circular tubes." Journal of Physics: Conference Series 2766, no. 1 (2024): 012072. http://dx.doi.org/10.1088/1742-6596/2766/1/012072.

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Abstract Falling film horizontal tube heat exchangers are used in several industrial applications such as sea water desalination, multi effect distillation, chemical industries, ocean thermal energy conversion systems and refrigeration. Different flow patterns that occur during falling film evaporation on an array of horizontal tubes are droplet, droplet-columnar, columnar, columnar-sheet and sheet modes. From the heat transfer point of view, a sheet mode (continuous falling film spanning the intertube space) is the most desirable falling-film mode. Falling film breakdown leads to the occurren

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19

Kracík, Petr, and Jiří Pospíšil. "EFFECT OF TUBE PITCH ON HEAR TRANSFER IN SPRINKLED TUBE BUNDLE." Acta Polytechnica 55, no. 5 (2015): 329. http://dx.doi.org/10.14311/ap.2015.55.0329.

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Water flowing on a sprinkled tube bundle forms three basic modes: the Droplet mode (the liquid drips from one tube to another), the Jet mode (with an increasing flow rate, the droplets merge into a column) and the Membrane (Sheet) mode (with a further increase in the flow rate of the falling film liquid, the columns merge and create sheets between the tubes. With a sufficient flow rate, the sheets merge at this stage, and the tube bundle is completely covered by a thin liquid film). There are several factors influencing both the individual modes and the heat transfer. Beside the above-mentione

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20

Honda, H., S. Nozu, and Y. Takeda. "A Theoretical Model of Film Condensation in a Bundle of Horizontal Low Finned Tubes." Journal of Heat Transfer 111, no. 2 (1989): 525–32. http://dx.doi.org/10.1115/1.3250709.

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The previous theoretical model of film condensation on a single horizontal low finned tube is extended to include the effect of condensate inundation. Based on the flow characteristics of condensate on a vertical column of horizontal low finned tubes, two major flow modes, the column mode and the sheet mode, are considered. In the column mode, the surface of the lower tubes is divided into the portion under the condensate column where the condensate flow is affected by the impinging condensate from the upper tubes, and the portion between the condensate columns where the condensate flow is not

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21

Petrukovich, A. A., T. l. Zhang, W. Baumjohann, et al. "Oscillatory magnetic flux tube slippage in the plasma sheet." Annales Geophysicae 24, no. 6 (2006): 1695–704. http://dx.doi.org/10.5194/angeo-24-1695-2006.

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Abstract. Cluster observations in the magnetotail revealed an abundance of strongly inclined current sheets. We determine the magnetic configuration of a particular subset of such phenomena: a series of sheet crossings, having significantly differing inclinations and occurring during quiet conditions. These wave-like variations appear to propagate azimuthally and their magnetic amplitude and magnetic gradient (current density) inside the sheet are proportional to their steepness (degree of inlcination). In spite of significant normal direction changes between neighboring crossings up to 150°,

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22

Wu, Jun, Zhaoli Zheng, Yong Li, Jie Pang, Zhiwu Ke, and Nan Zhang. "Numerical research on thermal stress of steam cooler tube sheet mechanical structure." Journal of Physics: Conference Series 2125, no. 1 (2021): 012013. http://dx.doi.org/10.1088/1742-6596/2125/1/012013.

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Abstract Steam cooler is one of the most important mechanical equipment in thermal power generation system and nuclear power generation system. The steam cooler bears a huge temperature gradient load when the working conditions are switched. In order to analyze the thermal stress of steam cooler tube sheet with high temperature load under harsh working conditions, the thermal-structural coupling analysis model of steam cooler tube sheet is constructed with finite element method. The results show that the stress concentration exists at the position connection between heat exchanger tube and cyl

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23

Yang, Hong Gang. "Numerical Simulation of Sheet to Cylindrical Tube Single-Sided Spot Welding." Advanced Materials Research 443-444 (January 2012): 684–87. http://dx.doi.org/10.4028/www.scientific.net/amr.443-444.684.

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With the promotion of lightweight structure, hydroformed tubes have been widely used in the automobile industry. In order to join different parts, sheet to tube single-sided spot welding (SSSW) is proposed. In the present study, numerical simulation method is employed, and an electrical-thermal mechanical coupled finite element model is established for predicting the nugget size and shape of sheet to cylindrical tube SSSW. Because of the welding deformation, doughnut weld nugget is formed and the course of the welding deformation can be reflected by the electrode displacement.

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24

Wang, Xiaorui, Jiang Wang, Chunhui Huang, Qing Ye, and Jinzhong Zhai. "Research on Uplift Mechanism of Shield Tunnel Based on Multi-factor Construction Conditions." Academic Journal of Science and Technology 10, no. 1 (2024): 211–15. http://dx.doi.org/10.54097/t8pn3s55.

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In order to investigate the influence degree of each factor on tube sheet uplift and tube sheet uplift law of shield tunneling, this thesis takes the background of Zhengzhou Railway Transit Line 6 Phase I Project Weizhuang Station ~ Cargo Station Street Station Interval Project, and establishes ABAQUS finite element numerical model based on the influence factors such as shield thrust, slurry density, grouting pressure, etc., and analyzes the interaction relationship between the influence factors of tube sheet uplift caused by the shield tunneling construction period. The paper investigates the

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25

Quinlan, R. A., and M. Stewart. "Crystalline tubes of myosin subfragment-2 showing the coiled-coil and molecular interaction geometry." Journal of Cell Biology 105, no. 1 (1987): 403–15. http://dx.doi.org/10.1083/jcb.105.1.403.

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We have produced crystalline tubes of chicken breast myosin long subfragment-2 that show order to resolutions better than 2 nm. The tubes were formed from a thin sheet in which the myosin long subfragment-2 molecules were arranged on an approximately rectangular crystalline lattice with a = 14.1 +/- 0.2 nm and b = 3.9 +/- 0.1 nm in projection. Shadowing indicated that the tube wall was approximately 7 nm thick and that the sheets from which it was formed followed a right-handed helix. Superposition of the lattices from the top and bottom of the tube produced a moire pattern in negatively stain

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26

Hofmann, Meike, Shima Gharbi Ghebjagh, Chao Fan, Yuchao Feng, Karen Lemke, and Stefan Sinzinger. "Linearly modulated multi-focal diffractive lens for multi-sheet excitation of flow-driven samples in a light-sheet fluorescence microscope." EPJ Web of Conferences 266 (2022): 04004. http://dx.doi.org/10.1051/epjconf/202226604004.

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Light-sheet fluorescence microscopy (LSFM) with single light-sheet illumination enables rapid 3Dimaging of living cells. In this paper we show the design, fabrication and characterization of a diffractive optical element producing several light sheets along an inclined tube for applications in flow-driven imaging. The element, which is based on a multi-focal Fresnel zone plate and a linear grating, generates in combination with a refractive cylindrical lens five thin light sheets of equal intensity.

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27

Hussein, Rafea Dakhil, Dong Ruan, and Guo Xing Lu. "Comparative Research on the Crushing Behaviour of Aluminium Sheet Wrapped Square Carbon Fibre Reinforced Plastic (CFRP) Tubes." Key Engineering Materials 725 (December 2016): 82–87. http://dx.doi.org/10.4028/www.scientific.net/kem.725.82.

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In this study, hollow square carbon fibre reinforced plastic (CFRP) tubes and aluminium sheet wrapped CFRP tubes have been axially crushed at a quasi-static loading velocity of 0.05 mm/s. A specially designed and manufactured platen with four cutting blades was used to cut and crush these two tubular structures. The four cutting blades had height of 5 mm and width of 3 mm with round tip to reduce the initial peak force and achieve a stable crushing deformation mode. Notches at one end of each tube were utilized to control the location of initial failure. The crashworthiness characteristics of

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28

Eko Aprianto Nugroho and Abdul Rahman Agung Ramadhan. "PROSES EXPAND TUBE HEAT EXCHANGER ETHYLENE SUPER HEATER H072 DI PT. INTAN PRIMA KALORINDO." Jurnal Teknik dan Science 3, no. 3 (2024): 14–21. https://doi.org/10.56127/jts.v3i3.1796.

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Expand Tube is a deformation process that is carried out in a cold state, to obtain a density between the tube and the tube hole in the tube sheet. This process aims to obtain a tight/tight connection so as to prevent leaks and not be separated from the seat, while minimizing stress corrosion and cracks axially in the transition zone behind the tube sheet. heater H072: 1. Carry out the stages of expanding tube heat exchanger ethylene super heater H072. 2. Obtain data on the tube when the process of expanding the tube heat exchanger ethylene super heater H072 is carried out. 3. Know the accepta

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29

Day, Maxwell C., and Frank C. Hawthorne. "A structure hierarchy for silicate minerals: chain, ribbon, and tube silicates." Mineralogical Magazine 84, no. 2 (2020): 165–244. http://dx.doi.org/10.1180/mgm.2020.13.

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AbstractA structure hierarchy is developed for chain-, ribbon- and tube-silicate based on the connectedness of one-dimensional polymerisations of (TO4)n− tetrahedra, where T = Si4+ plus P5+, V5+, As5+, Al3+, Fe3+, B3+, Be2+, Zn2+ and Mg2+. Such polymerisations are described by a geometrical repeat unit (with ng tetrahedra) and a topological repeat unit (or graph) (with nt vertices). The connectivity of the tetrahedra (vertices) in the geometrical (topological) repeat units is denoted by the expression cTr (cVr) where c is the connectivity (degree) of the tetrahedron (vertex) and r is the numbe

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30

Al-Qattan, MM. "Fabrication of Silicone Tubes in Experimental Nerve Surgery." Canadian Journal of Plastic Surgery 3, no. 1 (1995): 54–55. http://dx.doi.org/10.1177/229255039500300102.

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A technique of fabricating silicone tubes to the desired dimensions from a silicone sheet is described. The fabricated tube was used successfully as a conduit for the rat tibial nerve defect. The advantages and disadvantages of fabricated tubes are discussed.

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Liang, Cai Ping, Ning Li, and Fang Fang Sun. "Simulation Analysis on the Contact Status during Sheet-to-Tube Single Sided Spot Welding Process." Advanced Materials Research 815 (October 2013): 742–46. http://dx.doi.org/10.4028/www.scientific.net/amr.815.742.

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Single sided resistance spot welding (SSRSW) developed from RSW is a feasible plan to join vehicle structure to closed-form tube and is increasingly used in automobile manufacturing. During the process of SSSW, large deformation and complex contact status of the workpieces occur because there is no inside support. The complex contact status has directly influence on the size of the nugget which is critical to the quality of welding. In this study, the contact statuses during the current stage of sheet-to-tube spot welding were researched by numerical method. It was found that the widths of the

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32

Wang, Zhan Liang, Yu Bin Gong, Hua Rong Gong, Jin Jun Feng, and Xiong Xu. "Design Sheet Beam Gun for THz Traveling-Wave Tube." Applied Mechanics and Materials 541-542 (March 2014): 470–73. http://dx.doi.org/10.4028/www.scientific.net/amm.541-542.470.

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The Sheet Electron Beam Vacuum Electron Device is an Attractive Choice for Generating High Power Millimeter/terahertz Wave Radiation. the Sheet Electron Beam Gun is a Key Component for the Sheet Beam Vacuum Electron Device. in this Paper, a Novel Sheet Electron Beam Gun was Proposed for a Terahertz Traveling-Wave Tube. the Theories of Sheet Beam Gun are Deduced Based on the Round Beam Gun Theories. the Track of 24.5kV, 1A, 0.4mm8mm Sheet Beam is Gained through 3D Particle-in-Cell Simulation and the Theories are Verified. the Investigation Results Show that, the Design Method of the Sheet Beam

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Zhang, Ren Tao, Xian Feng Chen, Hai Bo Su, and Zhi Yong Chen. "Numerical and Experimental Study of Forming Limit Diagrams in Sheet Metal Forming and Seamed Tube Hydroforming." Applied Mechanics and Materials 395-396 (September 2013): 914–19. http://dx.doi.org/10.4028/www.scientific.net/amm.395-396.914.

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The paper establishes the forming limit diagrams (FLDs) for QSTE340 seamed tube hydroforming and the mother sheet metal forming by numerical approach and experimental approach. A novel experimental approach is proposed to evaluate the formability for tube hydroforming under biaxial stretching through elliptical bulging.Then the Nakazima and three types of tube hydroforming tests are simulated with finite element (FE) program LS-DYNA. The failure criterion of thickness gradient criterion (TGC) is introduced. The FLDs for seamed tube hydroforming and the mother sheet metal forming are constructe

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34

BERMEJO-MORENO, IVÁN, D. I. PULLIN, and KIYOSI HORIUTI. "Geometry of enstrophy and dissipation, grid resolution effects and proximity issues in turbulence." Journal of Fluid Mechanics 620 (February 10, 2009): 121–66. http://dx.doi.org/10.1017/s002211200800476x.

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We perform a multi-scale non-local geometrical analysis of the structures extracted from the enstrophy and kinetic energy dissipation-rate, instantaneous fields of a numerical database of incompressible homogeneous isotropic turbulence decaying in time obtained by DNS in a periodic box. Three different resolutions are considered: 2563, 5123 and 10243 grid points, with kmax approximately 1, 2 and 4, respectively, the same initial conditions and Reλ ≈ 77. This allows a comparison of the geometry of the structures obtained for different resolutions. For the highest resolution, structures of enstr

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Horn, Mary, R. Veator, M. Pelletier, S. Gray, C. Bruynell, and C. Pacitto. "006–Bedside Tracheostomy Tube Profile Sheet." Journal of Pediatric Nursing 23, no. 2 (2008): e2. http://dx.doi.org/10.1016/j.pedn.2008.01.010.

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Gonçalves, Adriano, Luis M. Alves, and Paulo A. F. Martins. "Inclined Tube-Sheet Plastically Deformed Joints." steel research international 85, no. 1 (2013): 67–75. http://dx.doi.org/10.1002/srin.201300078.

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HORIUTI, KIYOSI, and TAKEHARU FUJISAWA. "The multi-mode stretched spiral vortex in homogeneous isotropic turbulence." Journal of Fluid Mechanics 595 (January 8, 2008): 341–66. http://dx.doi.org/10.1017/s0022112007009251.

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The stretched spiral vortex is identified using direct numerical simulation (DNS) data for homogeneous isotropic turbulence and its properties are studied. Its genesis, growth and annihilation are elucidated, and its role in the generation of turbulence is shown. Aside from the two symmetric modes of configurations with regard to the vorticity alignment along two spiral sheets and the vortex tube in the core region studied in previous works, a third asymmetric mode is found. One of the two symmetric modes and the asymmetric mode are created not by a conventional rolling-up of a single vortex s

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38

Krisdiyanto, Krisdiyanto, Muhamad Naufal Fikri, Rahmad Kuncoro Adi, and Ahmad Restian Adi Nugroho. "Stress Analysis on Tubesheet Referring to TEMA Standard." JMPM (Jurnal Material dan Proses Manufaktur) 5, no. 1 (2021): 52–57. http://dx.doi.org/10.18196/jmpm.v5i1.12340.

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A heat exchanger is a device used to transfer heat without mass transfer. The equipment must be designed according to established standards. The standard that is widely used is the standardissued by TEMA (Tubular Exchanger Manufacturer Association). The results of the design of theheat exchanger with these standards are considered less efficient in terms of the material. Theefficiency of the material used can be analyzed by stress analysis on the components that withstand the force, and one of these components is the tube sheet. Stress analysis on tube sheets can use finite element-based softw

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Altan, Taylan, Serhat Kaya, and Yingyot Aue-u-Ian. "Forming Al and Mg Alloy Sheet and Tube at Elevated Temperatures." Key Engineering Materials 344 (July 2007): 317–24. http://dx.doi.org/10.4028/www.scientific.net/kem.344.317.

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Experimental investigation on the formability limits of aluminum and magnesium alloys are conducted through hydraulic bulging and deep drawing. New tube hydroforming tooling was designed and the submerged tool concept is introduced. Tube hydroforming experiments were conducted with and without axial feed by using AA6061 tubes. The formability of Mg AZ31-O sheets are determined by hydraulic bulging using similar submerged tool. Finally the effect of temperature and initial blank size on the attainable highest punch velocity is investigated and round cups from Mg AZ31-O were successfully formed

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Fairushin, A. M., R. G. Rizvanov, D. V. Karetnikov, A. S. Tokarev, and S. O. Sibiryakova. "ABOUT THE USE OF TERMS «TUBE SHEET» AND «TUBE PLATE»." Petroleum Engineering 17, no. 1 (2019): 78. http://dx.doi.org/10.17122/ngdelo-2019-1-78-84.

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Nazzal, Mohammed A., and Fadi K. Abu-Farha. "Finite Element Modeling of Superplastic Forming of Tubular Shapes." Key Engineering Materials 433 (March 2010): 179–84. http://dx.doi.org/10.4028/www.scientific.net/kem.433.179.

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Most of the work done on superplastic forming is related to sheet metal forming. Very limited studies have been directed toward investigating the superplastic tube forming process. In this work, Finite Element (FE) simulations are carried out in order to simulate the superplastic tube forming process. The analysis is conducted for the superplastic magnesium alloy AZ31 at 400°C. The results clearly demonstrate that there is a significant difference between tube forming and sheet metal forming in terms of forming pressure profiles. In addition, the effects of tube radius, free forming length, an

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Gong, Dawei, Craig A. Grimes, Oomman K. Varghese, et al. "Titanium oxide nanotube arrays prepared by anodic oxidation." Journal of Materials Research 16, no. 12 (2001): 3331–34. http://dx.doi.org/10.1557/jmr.2001.0457.

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Titanium oxide nanotubes were fabricated by anodic oxidation of a pure titanium sheet in an aqueous solution containing 0.5 to 3.5 wt% hydrofluoric acid. These tubes are well aligned and organized into high-density uniform arrays. While the tops of the tubes are open, the bottoms of the tubes are closed, forming a barrier layer structure similar to that of porous alumina. The average tube diameter, ranging in size from 25 to 65 nm, was found to increase with increasing anodizing voltage, while the length of the tube was found independent of anodization time. A possible growth mechanism is pres

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Kim, Dae Guen, Hak Young Kim, Young Ok Yoon, Shae K. Kim, and Hyun Kyu Lim. "Effect of Plane Strain on the Microstructure and Texture of AZ31 Sheet with Various Reduction Ratios." Materials Science Forum 783-786 (May 2014): 396–401. http://dx.doi.org/10.4028/www.scientific.net/msf.783-786.396.

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In this study, the effect of plane strain on the microstructure and texture of AZ31 sheet was investigated with various reduction ratios. To achieve plane strain, that is, to prevent shear deformation during warm-rolling, AZ31 sheet was capsuled by pure Cu tube. The large strain induced by simple one-pass warm-rolling led to the significant grain refinement and texture randomization. The two-dimensional finite-element method showed that the warm-rolling of AZ31 sheet capsuled by Cu tube imposed a uniform plane strain in the whole sheet thickness. The high reduction ratio caused the dynamic rec

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Jiang, Shuang, Jun Cai, J. W. Zhang, and Y. D. Wang. "Stress Corrosion Analysis of Steam Generator Tube of Nuclear Power Plant by Finite Elements." Applied Mechanics and Materials 441 (December 2013): 295–99. http://dx.doi.org/10.4028/www.scientific.net/amm.441.295.

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The steam generator is operated under the pressure of 15.5MPa and the temperature 327°C. Under this working condition the junction of the heat transfer tube and tube-sheet is accident-prone areas of the steam generator. By using ANSYS to carry out a thermal structure coupling analysis on the junction, it is found that a large tensile stress along axial and tangential directions occurs on outer surface of the heat transfer tube and is located at the region of 2.0 mm to 6.0 mm high over the tube-sheet. The stress attributes to the rapidly change of temperature on the tube outer surface and leads

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Guo, De Peng, Xiao Ming Qian, Mao Lin Li, Wen Guang Zhang, Hong Wei Cai, and Gang Jin. "Examination and Repair on the Tube-Tube Sheet Welding Deviation of Steam Generator." Advanced Materials Research 803 (September 2013): 404–8. http://dx.doi.org/10.4028/www.scientific.net/amr.803.404.

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Tube-Tube sheet welding area of Steam Generator is one of the most fallibility positions in the first loop of Nuclear Power Plant. To make sure the Secondary side hydro-test of on site of Steam Generator is successful at the first round, the relative parties organize to check the 8948 Tube-Tube sheet sealing welding area before the test. Through the introduction of the Checking progress, for example, Defect confirming, Defect location, Defect dealing, Defect repair and other progress, the basic reason of deviation has been analyzed. And also, some discussions and concerns were given which will

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Wan, Yu, Wen Chun Jiang, and Jiang Bo Gao. "Weld Residual Stress in Tube to Tube Sheet Joints of a Heat Exchanger by Experimental and Finite Element Simulation." Applied Mechanics and Materials 853 (September 2016): 306–10. http://dx.doi.org/10.4028/www.scientific.net/amm.853.306.

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Shell-and-tube heat exchangers are widely used in petrol and petro-chemical industries. But weld residual stresses are generated in the tube-to-tube sheet joint and have a great effect on stress corrosion cracking. Therefore, a good prediction and an efficient evaluation of the weld residual stress are necessary to assure the structure integrity. In this work, X-ray diffraction measurement and finite element method have been used to study the residual stress distribution. The results show that the large tensile residual stresses, which have exceeded the yield stress, are generated in the tube

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Alves, LM, RM Afonso, and PAF Martins. "Mechanical joining of sheets to tubes by squeeze-grooving." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 234, no. 1 (2019): 120–29. http://dx.doi.org/10.1177/1464420719876965.

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The purpose of this paper is to present a mechanical joining process to produce sheet-tube connections in a single stroke, at room temperature. The proposed solution is an enhancement of a previous joining by squeeze-grooving process that makes use of two independent mandrels and a customized spacer to control the inner joint radius and to improve its overall aesthetics. The presentation is illustrated with selected examples retrieved from experimentation and finite element modeling. Results show that the new proposed sheet-tube connections are characterized by a better redistribution of mater

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Gao, Weimin, Yungang Li, and Lingxue Kong. "Numerical investigation of erosion of tube sheet and tubes of a shell and tube heat exchanger." Computers & Chemical Engineering 96 (January 2017): 115–27. http://dx.doi.org/10.1016/j.compchemeng.2016.10.005.

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Chen, Chen, Ying Hua Zhao, Chun Yang Zhu, and Li Wei. "Study on the Impact Response of Concrete Filled FRP-Steel Tube Structures." Advanced Materials Research 368-373 (October 2011): 549–52. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.549.

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This paper studies the impact performance of concrete filled FRP-steel tube which is a composed structure made by filling concrete into steel tube and wrapping outside with fiber reinforced polymer (FRP) sheet. Numerical simulations have been conducted to study the dynamic response of fixed-pined supported beams of concrete filled FRP-steel tubes. The finite element models of concrete filled FRP-steel tubes are established to analyse its lateral impact dynamic characteristics under different loading situations, with respective kinds of FRP and thicknesses of steel tubes. The impact force and d

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Shapoval, Oleksandr, Roman Vakulenko, Viktoriia D. Kulynych, and Iurii V. Savchenko. "Tube Sheet Ligament Thickness Selection and Stress Analysis during Tube Expansion." Key Engineering Materials 1004 (December 23, 2024): 85–91. https://doi.org/10.4028/p-h2x9di.

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The article deals with the simple two-dimensional axis-symmetric mechanical model of the technological system of the operation to distribute a steel pipe into a steel pipe grid is considered. The pressure amplitude during pulsed flaring and explosion welding of pipes with pipe grids is given. For solution under the Wilkins method, the pipe was divided into quadrilateral elements. Further, the deformed state was analyzed at a number of characteristic points located on the pipe outer surface and the bushing inner surface. The graph shows the radial displacements of points on the pipe surface in

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