The Experts below are selected from a list of 61827 Experts worldwide ranked by ideXlab platform
Sm Aceves - One of the best experts on this subject based on the ideXlab platform.
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modeling of sudden hydrogen expansion from cryogenic Pressure Vessel failure
International Journal of Hydrogen Energy, 2013Co-Authors: Guillaume Petitpas, Sm AcevesAbstract:Abstract We have modeled sudden hydrogen expansion from a cryogenic Pressure Vessel. This model considers real gas equations of state, single and two-phase flow, and the specific “Vessel within Vessel” geometry of cryogenic Vessels. The model can solve sudden hydrogen expansion for initial Pressures up to 1210 bar and for initial temperatures ranging from 27 to 400 K. For practical reasons, our study focuses on hydrogen release from 345 bar, with temperatures between 62 K and 300 K. The Pressure Vessel internal volume is 151 L. The results indicate that cryogenic Pressure Vessels may offer a safety advantage with respect to compressed hydrogen Vessels because i) the vacuum jacket protects the Pressure Vessel from environmental damage, ii) hydrogen, when released, discharges first into an intermediate chamber before reaching the outside environment, and iii) working temperature is typically much lower and thus the hydrogen has less energy. Results indicate that key expansion parameters such as Pressure, rate of energy release, and thrust are all considerably lower for a cryogenic Vessel within Vessel geometry as compared to ambient temperature compressed gas Vessels. Future work will focus on taking advantage of these favorable conditions to attempt fail-safe cryogenic Vessel designs that do not harm people or property even after catastrophic failure of the inner Pressure Vessel.
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CFD analysis of a cryogenic Pressure Vessel hydrogen leak
ASME International Mechanical Engineering Congress and Exposition Proceedings (IMECE), 2013Co-Authors: E R Ledesma-orozco, Sm Aceves, Adan Salazar-Garibay, Francisco Espinosa-lozaAbstract:This paper reports the numerical simulation of the sudden hydrogen release from a cryogenic Pressure Vessel due to a broken tube where hydrogen vents into the vacuum jacket . Real gas effects are considered and the specific "Vessel within Vessel" geometry of cryogenic Vessels. For practical reasons, this study focuses on hydrogen release from 34.5 MPa, with initial temperatures of 62 K and 300 K. The high Pressure Vessel internal volume is 151 L. Pressure versus time graphs indicate that the vacuum jacket resist the Pressure build up until reaching the rupture disc setting to finally release into the atmosphere, and a comparative of this result with the ASME Code burst Pressure calculation is presented. Copyright © 2013 by ASME.
J. C. Choi - One of the best experts on this subject based on the ideXlab platform.
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Expert system for process planning of Pressure Vessel fabrication by deep drawing and ironing
Journal of Materials Processing Technology, 2004Co-Authors: C. H. Kim, Chul Kim, J. H. Park, J. C. ChoiAbstract:The fiber reinforced composite material is widely used in the multi-industrial field where the weight reduction of the infrastructure is demanded because of their high specific modulus and specific strength. It has two main merits which are to cut down energy by reducing weight and to prevent explosive damage proceeding to the sudden bursting which is generated by the Pressure leakage condition. Therefore, Pressure Vessels using this composite material in comparison with conventional metal Vessels can be applied in the field such as defence industry, aerospace industry and rocket motor case where lightweight and the high Pressure are demanded. In this paper, for non-linear finite element analysis of E-glass/epoxy filament wound composite Pressure Vessel receiving an internal Pressure, the standard interpretation model is developed by using the ANSYS, general commercial software, which is verified as the accuracy and useful characteristic of the solution based on AutoLISP and ANSYS APDL. Both the preprocessor for doing exclusive analysis of filament wound composite Pressure Vessel and postprocessor that simplifies result of analysis have been developed to help the design engineers. © 2004 Elsevier B.V. All rights reserved.
J G Huang - One of the best experts on this subject based on the ideXlab platform.
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thermographic investigation of the fatigue behavior of reactor Pressure Vessel steels
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2001Co-Authors: B Yang, P K Liaw, Hsin Wang, L Jiang, J Y Huang, J G HuangAbstract:The fatigue behavior of reactor Pressure Vessel (RPV) steels during fatigue testing was monitored by an advanced, high-speed, high-sensitivity, nondestructive evaluation (NDE) technique called infrared (IR) thermography. Five stages of temperature profiles during fatigue were recorded: an initial increase of the mean specimen temperature followed by a temperature decrease, a constant (equilibrium) temperature region, an abrupt temperature increase, and a temperature drop after the specimen failure. Using the state-of-the-art IR camera, the temperature profiles were recorded cycle by cycle during 20 Hz fatigue testing. A theoretical model combining the thermoelastic, inelastic, and heat-conduction effects were used to explain and predict the temperature evolution during fatigue. Specifically, the temperature evolution was predicted, and the results were found to be in good agreement with the experimental data.
Yusuf Tansel Ic - One of the best experts on this subject based on the ideXlab platform.
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A knowledge-based material selection system for interactive Pressure Vessel design
International Journal on Interactive Design and Manufacturing (IJIDeM), 2020Co-Authors: Mustafa Yurdakul, Arif Balci, Yusuf Tansel IcAbstract:Continual introduction of new materials and improvements in existing materials increase the variety of materials that can be used for Pressure Vessel components. Among wide variety of materials, the most suitable one must be selected for a component by matching its functional requirements with various available materials’ specifications. This study proposes an interactive knowledge-based decision support system for selecting the most suitable material for a given Pressure Vessel component and its working environment. The developed decision support system, namely Pressure Vessel SELection (PVSEL), consists of two separate phases. In the first elimination phase of PVSEL, the user obtains a feasible set of alternative materials by answering various questions and providing lower-limit values at materials’ critical specifications. PVSEL, then, uses a ranking phase which uses ELECTRE, TOPSIS and VIKOR methods to rank the feasible materials. In the second phase, each alternative material’s ranking is determined by combining its performance values at weighted critical specifications (selection criteria), which are considered as important in meeting the functional requirements of the component. Usage of PVSEL is illustrated in the paper and the results show that the proposed PVSEL is an effective selection tool and provides meaningful results for the designers.
Guillaume Petitpas - One of the best experts on this subject based on the ideXlab platform.
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modeling of sudden hydrogen expansion from cryogenic Pressure Vessel failure
International Journal of Hydrogen Energy, 2013Co-Authors: Guillaume Petitpas, Sm AcevesAbstract:Abstract We have modeled sudden hydrogen expansion from a cryogenic Pressure Vessel. This model considers real gas equations of state, single and two-phase flow, and the specific “Vessel within Vessel” geometry of cryogenic Vessels. The model can solve sudden hydrogen expansion for initial Pressures up to 1210 bar and for initial temperatures ranging from 27 to 400 K. For practical reasons, our study focuses on hydrogen release from 345 bar, with temperatures between 62 K and 300 K. The Pressure Vessel internal volume is 151 L. The results indicate that cryogenic Pressure Vessels may offer a safety advantage with respect to compressed hydrogen Vessels because i) the vacuum jacket protects the Pressure Vessel from environmental damage, ii) hydrogen, when released, discharges first into an intermediate chamber before reaching the outside environment, and iii) working temperature is typically much lower and thus the hydrogen has less energy. Results indicate that key expansion parameters such as Pressure, rate of energy release, and thrust are all considerably lower for a cryogenic Vessel within Vessel geometry as compared to ambient temperature compressed gas Vessels. Future work will focus on taking advantage of these favorable conditions to attempt fail-safe cryogenic Vessel designs that do not harm people or property even after catastrophic failure of the inner Pressure Vessel.
