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Littérature scientifique sur le sujet « Pipes with varying section »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 31 juillet 2025

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Articles de revues sur le sujet "Pipes with varying section"

Yang, Kun, Jun Hu, and Tao Wang. "Heat-Flow Coupling Law for Freezing a Pipe Reinforcement with Varying Curvatures." Applied Sciences 13, no. 19 (2023): 10932. http://dx.doi.org/10.3390/app131910932.

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Using the temperature and seepage field-coupling module within COMSOL Multiphysics software, we examined freezing behavior and its evolving patterns in curved underground freezing pipes. This study employed transient states, with the Darcy’s law and porous-media heat-transfer options activated in the Physical Field Interface of the Physical Field and Variable Selection column. The models were created to establish numerical models of freezing reinforcement for both single and multiple pipes with various curvatures. These models were designed to simulate the evolving temperature and seepage fiel

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Yu, Hao, Feng Liang, Yu Qian, Junjie Gong, Yao Chen, and An Gao. "Phononic Band Gap and Free Vibration Analysis of Fluid-Conveying Pipes with Periodically Varying Cross-Section." Applied Sciences 11, no. 21 (2021): 10485. http://dx.doi.org/10.3390/app112110485.

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Phononic crystals (PCs) are a novel class of artificial periodic structure, and their band gap (BG) attributes provide a new technical approach for vibration reduction in piping systems. In this paper, the vibration suppression performance and natural properties of fluid-conveying pipes with periodically varying cross-section are investigated. The flexural wave equation of substructure pipes is established based on the classical beam model and traveling wave property. The spectral element method (SEM) is developed for semi-analytical solutions, the accuracy of which is confirmed by comparison

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Ao-kui, Xiong, and Wei Qing-ding. "The decay of swirling flows in a type of cross-section-varying pipes." Applied Mathematics and Mechanics 22, no. 8 (2001): 983–88. http://dx.doi.org/10.1007/bf02436398.

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Kotorynski, W. P. "Dispersion in Pipes with Slowly Varying Cross-Sections." SIAM Journal on Mathematical Analysis 25, no. 3 (1994): 915–40. http://dx.doi.org/10.1137/s0036141090183730.

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Xijie, Liu, Sami Ainane, and Yap Yit Fatt. "Modeling of liquid-solid flow erosion in curved pipes of gradually varying cross section." Journal of Physics: Conference Series 1276 (August 2019): 012028. http://dx.doi.org/10.1088/1742-6596/1276/1/012028.

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LUCHINI, PAOLO, and FRANÇOIS CHARRU. "Consistent section-averaged equations of quasi-one-dimensional laminar flow." Journal of Fluid Mechanics 656 (July 1, 2010): 337–41. http://dx.doi.org/10.1017/s0022112010002594.

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Section-averaged equations of motion, widely adopted for slowly varying flows in pipes, channels and thin films, are usually derived from the momentum integral on a heuristic basis, although this formulation is affected by known inconsistencies. We show that starting from the energy rather than the momentum equation makes it become consistent to first order in the slowness parameter, giving the same results that have been provided until today only by a much more laborious two-dimensional solution. The kinetic-energy equation correctly provides the pressure gradient because with a suitable norm

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Ključanin, Dino, and Abaz Manđuka. "The cantilever beams analysis by the means of the first-order shear deformation and the Euler-Bernoulli theory." Tehnički glasnik 13, no. 1 (2019): 63–67. http://dx.doi.org/10.31803/tg-20180802210608.

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The effect of the Timoshenko theory and the Euler-Bernoulli theory are investigated in this paper through numerical and analytical analyses. The investigation was required to obtain the optimized position of the pipes support. The Timoshenko beam theory or the first order shear deformation theory was used regarding thick beams where the shearing effect of the beam is considered. The study of the thin beams was performed with the Euler-Bernoulli theory. The analysis was done for stainless steel AISI-440C beams with the rectangular cross-section. The steel beams were a cantilever and stressed un

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JANG, DONG SOO, EUN-JI LEE, SANG HUN LEE, and YONGCHAN KIM. "THERMAL PERFORMANCE OF FLAT PLATE PULSATING HEAT PIPES WITH MINI- AND MICROCHANNELS." International Journal of Air-Conditioning and Refrigeration 22, no. 04 (2014): 1450025. http://dx.doi.org/10.1142/s2010132514500254.

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This study presents the thermal performance of pulsating heat pipes (PHPs) using distilled water with mini- and microchannels. The PHPs were fabricated with the channels of square cross section which had hydraulic diameters ranged from 1.6 to 3.2 mm in minichannels and from 0.714 to 0.941 mm in microchannels. The performance of the PHPs was measured and analyzed by varying hydraulic diameter, number of turns, filling ratio, and input power. The filling ratio of the working fluid varied from 0% to 100%. The input power was controlled in the range between 3.6 and 150 W. The hydraulic diameter, n

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Trykoz, L. V., S. M. Kamchatnaya, O. M. Pustovoitova, and A. O. Atynian. "The Investigation of Prestressed Pressure Pipes, Reinforced with Fiberglass Plastic." International Journal of Engineering Research in Africa 36 (June 2018): 1–11. http://dx.doi.org/10.4028/www.scientific.net/jera.36.1.

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The problem of a combined action of reinforced concrete pipe and fiberglass safety cage. The prestressed cage not only decreases deformability of a pipe under load but protects the material of a pipe from agressive external factors. The process of force transfer from concrete pipe and fiberglass has been analyzed and the equation of stress and deformation for pipes and fiberglass has been deduced. It is shown that stress in fiberglass does not remain constant varying wall thickness, reducing towards the concrete core. Hoop stresses in the concrete core increase towards the centre of a pipe. Un

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Verbanck, Michel A. "Assessment of sediment behaviour in a cunette-shaped sewer section." Water Science and Technology 33, no. 9 (1996): 49–59. http://dx.doi.org/10.2166/wst.1996.0174.

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The accumulation of deposits in sewers causes widespread concerns of either operational or environmental nature. It is believed that a number of sediment-related nuisances can substantially be controlled in adapting the characteristics of sewer pipes as a function of local constraints and circumstances. In particular, key design parameters such as cross-section shape or hydraulic roughness of inner walls are currently selected basing more on empiricism and intuition than on full knowledge of the sediment transport driving processes. A valid track for optimization of these parameters is to run

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Thèses sur le sujet "Pipes with varying section"

MARCELLINI, FRANCESCA. "Conservation laws in gas dynamics and traffic flow." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2009. http://hdl.handle.net/10281/7487.

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This PhD thesis is concerned with applications of nonlinear systems of conservation laws to gas dynamics and traffic flow modeling. The first part is devoted to the analytical description of a fluid flowing in a tube with varying cross section. We study the 2x2 model of the p-system and than, we extend the properties to the full 3x3 Euler system. We also consider a general nxn strictly hyperbolic system of balance laws; we study the Cauchy problem for this system and we apply this result to the fluid flow in a pipe wiyh varying section. Concerning traffic flow, we introduce a new macroscopic m

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Rasolonjanahary, Irina. "Wave propagation in pipes of slowly-varying radius with compressible flow." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/277876.

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The work presented in this thesis studies acoustic perturbations in slowly varying pipes. The slow variation is introduced in the form of a small parameter ${\epsilon}$ and through this in turn gives rise to a slow axial scale $X$ such that $X = {\epsilon}x$ where $x$ is the normal axial coordinate. This allows an asymptotic approach and the WKB method is used to solve the subsequent mathematical problems. The first deals with the existence of a trapped mode in a hard-walled pipe of varying radius conveying fluid. For the derived leading order propagating mode solution, its amplitude becomes s

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Huang, Rong. "Time-varying performance in the cross-section of mutual fund returns." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7191/.

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This thesis examines the central question of whether actively managed mutual funds generate returns beyond those offered by passively managed funds. Using a non-parametric change point test and a cross-sectional bootstrap technique, this study conducts the first comprehensive examination of mutual fund performance that explicitly controls for possible time-variation in both alpha and betas of the extended versions of the CAPM, without imposing any specific functional form on the nature of the time-variation in these parameters. We further use an FDR technique that is able to quantify the numbe

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Clogan, T. "Applications of a new exact solution of the Navier-stokes equations to flow in pipes of varying width." Thesis, University of Liverpool, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233818.

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Iacovides, H. "Momentum and heat transport in flow through 180deg. bends of circular cross section." Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373946.

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Makinde, Oluwole D. "Laminar flow in channels and tubes of varying cross-section : (an exploitation of perturbation theory)." Thesis, University of Bristol, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389905.

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Tanguay, Michel. "Computer simulations of fluid flow and heat transfer in pipes with internal twisted fins of triangular cross-section." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0034/MQ64250.pdf.

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Parent, Serge. "Experimental and numerical study of steel joist and girder cold-formed web members with periodically-varying section properties." Thèse, Université de Sherbrooke, 2004. http://savoirs.usherbrooke.ca/handle/11143/1775.

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Ce travail de la recherche est visé au développement d'équations du dessin pour les membres du tissu froid-formés avec les sections du non-uniforme. Ce type de membre regroupe des canaux fermés périodiquement, des canaux cousus et des canaux dos à dos avec les plaques de la latte. Les deux premiers types de membres peuvent être utilisés dans les solives comme une alternative à une section fermée soudée sans couture, pendant que la double assemblée du membre sera utilisée avec les poutres. Les algorithmes du dessin proposés résultent ou en une adaptation de méthodes du dessin classiques pour le

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Vosilov, Rustam, and Nicklas Bergström. "Cross-Section of Stock Returns: : Conditional vs. Unconditional and Single Factor vs. Multifactor Models." Thesis, Umeå University, Umeå School of Business, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-34898.

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<p>The cross-sectional variation of stock returns used to be described by the Capital Asset Pricing Model until the early 90‟s. Anomalies, such as, book-to-market effect and small firm effect undermined CAPM‟s ability to explain stock returns and Fama & French (1992) have shown that simple firm attributes, like, firm size and book-to-market value can explain the returns far better than Beta. Following Fama & French many other researchers examine the explanatory powers of CAPM and other asset pricing models. However, most of those studies use US data. There are some researches done in different

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Roberts, Sean David Kerth Christopher R. "Forage quality, animal performance, and carcass traits of steers finished on winter annual ryegrass (Lolium multiflorum Lam.) pasture with varying levels of corn supplementation." Auburn, Ala., 2005. http://repo.lib.auburn.edu/2005%20Fall/Thesis/ROBERTS_SEAN_9.pdf.

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Livres sur le sujet "Pipes with varying section"

Ontario. Ministry of Transportation. Surveys & Design Office. A user's guide to the "Ontario provincial standards for roads and municipal services". [Ontario Ministry of Transportation], 1992.

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World Explorer: People, Places, and Cultures, Guide to the Essentials Teacher's Manual, Answers to all review and test questions in Guide to the Essentials in English and Spanish, Strategies for reaching students of varying abilities (Prentice Hall, Pearson Education, Section-by-Section Reading Support). Prentice Hall, 2003.

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Francis, Roger. The Corrosion of Duplex Stainless Steels: A Practical Guide for Engineers. NACE International, The Worldwide Corrosion Authority15835 Park Ten Place, Houston, TX 77084, 2018. https://doi.org/10.5006/37636.

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Duplex stainless steels (DSSs) were first invented in the early part of the 20th century, but it was not until the 1970s and 80s, with the introduction of argon oxygen decarburization (AOD) melting and the recognition of the benefits of nitrogen additions, that DSSs became attractive for widespread industrial use. DSSs have found applications in most industries, including oil and gas, marine, desalination, power, chemical and process, pulp and paper, and mineral processing. DSSs have been adopted by many industries to varying degrees. They are the workhorse corrosion resistant alloy (CRA) of t

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Licandro, Priscilla, Astrid Fischer, and Dhugal J. Lindsay. Cnidaria: Scyphozoa and Non-Colonial Hydrozoa. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780199233267.003.0018.

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This chapter describes the taxonomy of scyphozoa and non-colonial hydrozoa. The Phylum Cnidaria assembles highly diverse primitive invertebrates that carry stinging cells called cnida. The presence of cnida, which are organized in specialized structures called cnidocysts (or nematocysts), makes the organisms of this group venomous to varying degrees. The chapter covers their life cycle, ecology, and general morphology. It includes a section that indicates the systematic placement of the taxon described within the tree of life, and lists the key marine representative illustrated in the chapter

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Winterton, Jonathan. Training, Development, and Competence. Edited by Peter Boxall, John Purcell, and Patrick M. Wright. Oxford University Press, 2009. http://dx.doi.org/10.1093/oxfordhb/9780199547029.003.0016.

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This article provides the context for training, development, and competence. In the training section, theory, policy, and practice are considered, including the diversity of national systems for vocational education and training (VET) and the relationship between work organization and workplace learning. The development section is distinguished from training in terms of objectives and scope, while the emergence of Human Resource Development (HRD) is explained not only in terms of a more strategic focus but also in relation to initiatives like corporate universities. The competence section addr

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Stern, Marc J. Organizational theories. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198793182.003.0007.

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This chapter summarizes theories related to organizational learning, innovation, adaptation, and performance, directly addressing questions of accountability, leadership, risk, monitoring and evaluation, teamwork, appropriate levels of worker discretion, and collaboration. The theories and lessons shared apply to a wide range of organizational contexts, including both non-profit and for-profit organizations, government agencies, and other types of organizations of varying sizes and structures. They also apply for those working within, across, and outside of organizations on environmental or su

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Magnusson, Eva, and Jeanne Marecek. Setting the Stage. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190658540.003.0001.

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This chapter lays the groundwork for navigating psychological scholarship on gender, sex, and sexualities. It presents some central concepts in these fields, as well as tools for thinking about and asking questions about these concepts and their use. The chapter begins with a discussion of social categories and categorization and then moves to a focus on sex categories. Next is an examination of three concepts that psychologists employ with great frequency, but with varying and sometimes ambiguous meanings: gender, difference, and “the social.” The closing section offers a series of questions

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Leonard, Bill, and Jill Crainshaw, eds. Encyclopedia of Religious Controversies in the United States. 2nd ed. ABC-CLIO, 2012. http://dx.doi.org/10.5040/9798216007265.

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This book provides a thorough introduction to historical and contemporary issues in American religion, tackling controversial hot-button topics such as abortion, Intelligent Design, and Scientology. Surveying key aspects of the controversial issues, persons, and religious groups of today,Encyclopedia of Religious Controversies in the United States, Second Editionis a thorough update and expansion of the first edition of this book. This two-volume work contains many new entries that reflect current 21st-century religious controversies. Written by a variety of scholars with varying specializatio

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Rothstein, Stanley. Class, Culture, and Race in American Schools. Greenwood Publishing Group, Inc., 1995. http://dx.doi.org/10.5040/9798400627149.

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Class, culture, and race have influenced the educational experiences of children for centuries. As a new wave of Latin American and Asian peoples enters the United States, public schools are faced with the challenge of educating children from a culture of poverty, and who have varying racial and cultural backgrounds. This reference work employs historical, anthropological, sociological, and theoretical perspectives to overview current information on class, culture, and race in U.S. schools. The volume is organized systematically, with broad sections on class, culture, race, and prospects for t

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Cerna, Lucie. European High-Skilled Migration Policy. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198815273.003.0005.

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The chapter argues that while Europe needs high-skilled immigrants to fill labour shortages and respond to ageing populations, it continues to struggle recruiting these immigrants due to incre asing political tensions over immigration, which can also affect the highly skilled. These tensions are visible in the varying national policies and Blue Card versions at the EU level. The chapter analyses demographic, economic, and political challenges in Europe and traces high-skilled immigration policy developments over the last decade, both in terms of national policies and the adoption of the EU Blu

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Chapitres de livres sur le sujet "Pipes with varying section"

Bertelsen, Arnold F. "Flow in Pipes with Varying Cross Sections." In Biomechanical Transport Processes. Springer US, 1990. http://dx.doi.org/10.1007/978-1-4757-1511-8_6.

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Li, Song-Zhe, and Rong-Zhi He. "The Calculation of Temperature and Velocity Field as Well as Heat Pipe Exchanger of Constant Gas Velocity and Varying Cross Section." In Heat Transfer Enhancement And Energy Conservation. CRC Press, 2024. http://dx.doi.org/10.1201/9781003575726-79.

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Hammond, P. S., A. W. Meredith, J. R. A. Pearson, and J. Billingham. "Modelling Gas-Liquid Flow through Pipes of Variable Cross-Section." In Fluid Mechanics and Its Applications. Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-017-1996-4_22.

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Bird, C., T. N. Phillips, and K. Walters. "Secondary Flow of Fluids in Pipes of Non-Circular Cross Section." In Progress and Trends in Rheology V. Steinkopff, 1998. http://dx.doi.org/10.1007/978-3-642-51062-5_61.

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Tunca, Osman. "Optimum Design of Beams with Varying Cross-Section by Using Application Interface." In Springer Tracts in Nature-Inspired Computing. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6773-9_11.

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Voigt, Immanuel, Axel Fickert, Hajo Wiemer, and Welf-Guntram Drossel. "Experimental Investigation of Passive Thermal Error Compensation Approach for Machine Tools." In Lecture Notes in Production Engineering. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-34486-2_19.

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AbstractConventional approaches to counteract thermal issues in machine tools often require a significant amount of electrical energy input, such as in active cooling systems. An energy-efficient way for reducing thermal errors is to use passive components that redistribute heat introduced by feed drives and other internal heat sources. On the one hand, latent heat storage units can be integrated into the machine to enhance the thermal stability within the phase transition temperature range of the underlying phase change material. By using latent heat storage units, the impact of highly time-v

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Junhong, Zhang. "Research and Application of Balanced Rise of Concrete High Arch Dam." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-9184-2_11.

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AbstractIn the construction of domestic concrete high arch dams, there have been varying degrees of situations where the height difference between adjacent dam sections and the entire dam exceeds the design indicators. Due to the complex structure, large scale, high temperature control requirements for the dam body concrete, strict control requirements for the height difference between adjacent dam sections and the entire dam body, and complex boundary conditions, the rising speed of the bank slope dam section, non-orifice dam section, and orifice dam section is not consistent during the const

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Jayant, Bhagya, Ark Rukhaiyar, Kunal Dahiya, and Ritu Raj. "CFD Analysis for Wind Flow Characteristics of Varying Cross-Section Tall Building Using ANSYS." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-5077-3_25.

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Zhang, Yerong, and Zhiqiang Hu. "A mathematical model for variable cross-section hull girder with time-varying mass characteristics." In Advances in the Analysis and Design of Marine Structures. CRC Press, 2023. http://dx.doi.org/10.1201/9781003399759-34.

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Kim, Chul Ju, Jae Seok Lee, Sung Hoon Kim, and Byung Ho Sung. "An Analysis of Liquid Film Condensation Occurring Inside Rotating Heat Pipes with a Trigonal Cross Section." In Solid State Phenomena. Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/3-908451-29-9.257.

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Actes de conférences sur le sujet "Pipes with varying section"

Tang, Dezhi, Yanxia Du, Banghui Deng, Jie Liu, Dawei Zhuang, and Yufa Deng. "Field Testing and Evaluation on Cathodic Protection of Horizontal Directional Drill Pipe Sections." In CONFERENCE 2025. AMPP, 2025. https://doi.org/10.5006/c2025-00393.

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Abstract Cathodic protection (CP) is critically important for horizontal directional drill (HDD) pipe section since the integrity of coating is usually damaged due to the pull-back of pipeline during installation. Unfortunately, CP criteria and field testing method for CP parameters of HDD pipe section have not reached a consensus so far. In this work, a field testing method was proposed for evaluating CP of the whole HDD pipe section, with the buried depths varying from 3 meters to tens of meters. The results show that the proposed field testing method can measure potential of HDD pipe sectio

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Kosec, T., P. Mocnik, T. Ohligschläger, et al. "Corrosion of Stainless Steels in Sulfuric Acid Environments: Influence of Chloride Content and Temperature." In CORROSION 2021. AMPP, 2021. https://doi.org/10.5006/c2021-16943.

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Abstract Stainless steel is a common material in reactors, tanks, pipes, mixers, filters and valves in process industry. The selection of a suitable stainless steel grade for a specific industrial application is conducted based on the characteristics of the environment, but often limited by the foreseen lifecycle costs. For applications in raw material sector, the main challenge is that corrosion performance data for several stainless steel grades for, e.g., hydrometallurgical processes is lacking. Corrosion rate of the materials may remain low when general corrosion is the primary corrosion f

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JIA, YANHUI, and ZIXUE GUO. "NUMERICAL STUDY ON THE INNER FLOW FIELD OF PIPES WITH VARYING CROSS-SECTIONS." In CMEM 2017. WIT Press, 2017. http://dx.doi.org/10.2495/cmem170041.

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Nguyen, Hung, Shoubo Wang, Ram S. Mohan, Ovadia Shoham, and Gene Kouba. "Experimental Investigations of Droplet Deposition and Coalescense in Curved Pipes." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88365.

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Even though there have been several studies conducted by the industry on the use of different inlet devices for gas-liquid separation there have been limited laboratory and field evaluations on the use of external piping configurations as flow conditioning devices upstream of a separator inlet. The results of a systematic study of droplet deposition and coalescence in curved pipe and pipe fittings are reported in this paper. A facility has been designed consisting of two main test sections: a fixed horizontal straight pipe section and an interchangeable 180° return pipe section (or curved pipe

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Crawford, Susan L., Steven R. Doctor, Anthony D. Cinson, Michael W. Watts, Traci L. Moran, and Michael T. Anderson. "Preliminary Assessment of NDE Methods on Inspection of HDPE Butt Fusion Piping Joints for Lack of Fusion With Validation From Mechanical Testing." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25280.

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Studies at the Pacific Northwest National Laboratory (PNNL) in Richland, Washington, are being conducted to evaluate nondestructive examinations (NDE) coupled with mechanical testing of butt fusion joints in high density polyethylene (HDPE) pipe for assessing lack of fusion. The work provides information to the United States Nuclear Regulatory Commission (NRC) on the effectiveness of volumetric inspection techniques of HDPE butt fusion joints in Section III, Division 1, Class 3, buried piping systems in nuclear power plants. This paper describes results from preliminary assessments using ultra

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Rosen Esquivel, Patricio I., Jan H. M. ten Thije Boonkkamp, Jacques A. M. Dam, and Robert M. M. Mattheij. "A Parametric Study of the Effect of Wall-Shape on Laminar Flow in Corrugated Pipes." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-03044.

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In this paper we study the effect of wall-shape on laminar flow in corrugated pipes. The main objectives of this paper are to characterize how the flow rate varies with wall-shape, and to identify which shapes enhance the flow rate. We conduct our study by numerically solving the Navier-Stokes equations for a periodic section of the pipe. The numerical model is validated with experimental data on the pressure drop and friction factor. The effect of wall-shape is studied by considering a family of periodic pipes, in which the wall-shape is characterized by the amplitude, and the ratio between t

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Özçatalbaş, Mustafa, and Ramazan Aykut Sezmen. "Modeling Transient Heat Transfer and Dry-Out Phenomena in Heat Pipes Using Finite Element Analysis." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23126.

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Abstract Heat pipes are passive two-phase heat transfer devices that used in various heat transport applications because of their high thermal conductance capacities with low temperature differences. One of these applications is aerospace avionics that heat pipes are exposed to transient heat loads. Although heat pipes have been one of the heat removal alternatives for compact electronic devices, they have some restrictions during the usage in such high heat flux areas. In order to use heat pipes as effective heat removal devices, operating heat load range should not be exceeded during the ope

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Ariyoshi, Gen, Daisuke Ito, Yasushi Saito, and Kaichiro Mishima. "Turbulent Characteristics in Lead-Bismuth Flows Flowing in Poor and Good Wettability Pipes." In 2016 24th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/icone24-60488.

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Lead-bismuth single-phase and two-phase upward flows in a round tube were measured by using an electro-magnetic probe and an electrical conductivity probe. Experiments were performed under adiabatic conditions by varying the superficial gas and liquid velocity from 0 to 0.04 m/s and 0.1 to 0.2 m/s respectively. From the experimental results, it was found that the local liquid velocity and the void fraction in the lead-bismuth two-phase flow take the maximum value near the wall region at low void fraction conditions. These results indicate bubbles would tend to flow along the wall surface due t

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O¨rjasaeter, Oddvin, Olav Jan Hauge, Guy Ba¨rs, and Per Egil Kvaale. "Crack Growth During Full Scale Reeling Simulation of Pipes With Girth Welds." In ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/omae2004-51365.

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Installation of pipelines by reeling has proved to be an effective method. However, the pipe bending results in very high stress and strain and cannot be handled by conventional design rules, as stated in design codes, e.g. [2]: High strain crack growth must be assessed according to specific case-by-case selected criterions. In the present work the performance of 10” and 12 3/4” pipes with typical weld defects is studied — from initiation of cracks at notches to final fracture. Information was obtained from several sources: full scale cyclic bending of pipes, FE simulations, and small-scale te

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Crawford, Susan L., Steven R. Doctor, Anthony D. Cinson, Michael W. Watts, Traci L. Moran, and Michael T. Anderson. "Assessment of NDE Methods to Detect Lack of Fusion in HDPE Butt Fusion Joints." In ASME 2011 Pressure Vessels and Piping Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/pvp2011-57908.

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Studies at the Pacific Northwest National Laboratory (PNNL) in Richland, Washington, were conducted to evaluate nondestructive examinations (NDE) coupled with mechanical testing of butt fusion joints in high-density polyethylene (HDPE) pipe for assessing lack of fusion. The work provided information to the United States Nuclear Regulatory Commission (NRC) on the effectiveness of volumetric inspection techniques of HDPE butt fusion joints in Section III, Division 1, Class 3, buried piping systems in nuclear power plants. This paper describes results from assessments using ultrasonic and microwa

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Rapports d'organisations sur le sujet "Pipes with varying section"

Fourie and Tullmin. L51912 Corrosion-CP Monitoring of Locations Remote from a Test Station. Pipeline Research Council International, Inc. (PRCI), 2002. http://dx.doi.org/10.55274/r0010624.

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It is accepted that many situations exist on pipelines where a significant length of the pipeline (typically 2000 ft to 5 miles) is either totally inaccessible or access is so difficult or expensive that monitoring is not done at the required frequency. The need for finding a technique to allow the corrosion engineer to monitor CP levels of inaccessible locations from an accessible remote location has therefore been identified. A study to investigate all possible techniques available to achieve the above objective and to analyze typical scenarios requiring this approach has therefore been unde

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Chen. PR-244-9827-R03 Preliminary Finite Element Analysis of Local Buckling. Pipeline Research Council International, Inc. (PRCI), 2008. http://dx.doi.org/10.55274/r0011037.

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Numerical studies were carried out for NPS 20 and NPS 30 pipes with three corrosion configuration and varying internal pressures. The pipes under consideration has a yield strength range from 56 to 70 ksi and D/t ratio range from 64 to 91.

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Guo, Hui. Time-Varying Risk Premia and The Cross Section of Stock Returns. Federal Reserve Bank of St. Louis, 2002. http://dx.doi.org/10.20955/wp.2002.013.

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Chen. PR-244-9827-R01 Local Buckling and Collapse of Corroded Pipes. Pipeline Research Council International, Inc. (PRCI), 2008. http://dx.doi.org/10.55274/r0011076.

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This project address local buckling (or wrinkling) associated with pipe wall instability in the axial direction when subjected to bending or axial compression. It considered the collapse of the cross-section under circumferential compression due to external pressure.

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Lobanow, Igor E. THEORETICAL MATHEMATICAL MODELING OF HYDRAULIC RESISTANCE IN PIPES WITH TURBULIZERS OF THE CIRCULAR CROSS SECTION AT THE TURBULENT CURRENT. Bulletin of Science and Technical Development, 2018. http://dx.doi.org/10.18411/vntr2018-126-3.

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Gill. L51675 Effects of Weldment Property Variations on the Behavior of Line Pipe. Pipeline Research Council International, Inc. (PRCI), 1993. http://dx.doi.org/10.55274/r0010133.

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A steel weldment is a composite of zones or layers of different microstructures that possess different material properties. The zones include the base metal (or the sections of pipe), the weld metal, and a complex heat-affected zone (HAZ) of base metal that has been exposed to a variety of thermal cycles resulting in varying microstructures. The material properties of primary concern with respect to the mechanical behavior of the pipe are the stress-strain response (the constitutive properties) and the resistance to initiation and propagation of cracks or tears in the presence of a crack, notc

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Agudelo Urrego, Luz María, Chatuphat Savigamin, Devansh Gandhi, Ghadir Haikal, and Antonio Bobet. Assessment of Pipe Fill Heights. Purdue University Press, 2023. http://dx.doi.org/10.5703/1288284317612.

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The design of buried pipes, in terms of the allowable minimum and maximum cover heights, requires the use of both geotechnical and structural design procedures. The geotechnical procedure focuses on estimating the load on the pipe and the compressibility of the foundation soil. The focus of the structural design is choosing the correct cross-section details of the pipe under consideration. The uncertainties of the input parameters and installation procedures are significant. Because of that, the Load Resistance Factor Design (LRFD) method is considered to be suitable for the design of buried p

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Denys, R. M., and A. A. Lefevre. L51931 Weld Metal Yield Strength Mismatch and Yield-to-Tensile Ratio on the Girth Welds in API 5L X80. Pipeline Research Council International, Inc. (PRCI), 2002. https://doi.org/10.55274/r0011239.

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An experimental program has been conducted to quantify the failure characteristics and flaw tolerance levels of pipeline girth welds made in large diameter pipes of API 5L X 80 quality. The test programme was designed such as to verify whether, in the presence of surface breaking root flaws of nominally 3.0 mm deep, such girth welds can accommodate remote pipe metal strains of minimum 0.50 % (Gross Section Yielding).

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Kiefner and Duffy. L51509 Two-Phase Flow in Horizontal and Inclined Pipes at Large Pipe Size and High Gas Density. Pipeline Research Council International, Inc. (PRCI), 1986. http://dx.doi.org/10.55274/r0010275.

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Knowledge of flow regime, holdup and pressure drop is needed in order to design gas and oil pipelines confidently and to minimize construction and operating costs. Previous public studies of two-phase flow in inclined pipes have used small diameter pipes two inches in diameter or less, and have primarily used air and water as the working fluids at low pressure (near one atmosphere). Present design methods are based upon the results of these experiments. In most advanced analyses available today, the flow regime transition is governed by a Froude number, the balance between inertial and buoyanc

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Clapham, Lynann, and Vijay Babbar. PR-320-113706-R01 Neutron Diffraction Measurements of Residual Strain from Dents and Gouges in Pipelines. Pipeline Research Council International, Inc. (PRCI), 2020. http://dx.doi.org/10.55274/r0011643.

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Mechanical damage is one of the most prevalent causes of pipeline failure in North America and Europe. Gouged dents are much more likely to produce a failure than "plain" dents (i.e., a dent with no coincident metal loss or crack features), however the residual stresses around gouged dents are more difficult to model and predict. The Pipeline Aggression Rig (PAR) located in the St. Denis facility of GdF Suez was used to introduce backhoe-type gouging into pipe samples, which were nine pressurized pipe sections of varying grades. Five (5) samples were created using high-impact dynamic aggressio

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