The Experts below are selected from a list of 15279 Experts worldwide ranked by ideXlab platform
D. Perreux - One of the best experts on this subject based on the ideXlab platform.
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optimal design of a type 3 hydrogen vessel part i analytic modelling of the Cylindrical Section
International Journal of Hydrogen Energy, 2006Co-Authors: D. Chapelle, D. PerreuxAbstract:The present paper aims to study the Cylindrical Section of a Type 3 high-pressure hydrogen storage vessel, combining an aluminium liner which prevents gas diffusion and an overwrapped composite devoted to reinforce the structure. Today, this technique is widely used but still requires consistent time investments whenever a competitive solution, involving to definitely increase weight efficiency, is needed. The laminate composite is assumed to be an elasto-damage material whereas the liner behaves as an elasto-plastic material. Based on the classical laminate theory and on Hill's criterion to take into account the anisotropic plastic flow of the liner, the model provides an exact solution for stresses and strains on the Cylindrical Section of the vessel under thermomechanical static loading. Part I focuses on the theoretical background. The effect of the stacking sequence on the gap occurrence, on the residual stress magnitude and on the structure stiffness may then be investigated. This will be done and be compared with results of experiments which are carried out on prototypes in the second part of this paper before an optimization is performed.
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Optimal design of a Type 3 hydrogen vessel: Part I—Analytic modelling of the Cylindrical Section
International Journal of Hydrogen Energy, 2006Co-Authors: D. Chapelle, D. PerreuxAbstract:The present paper aims to study the Cylindrical Section of a Type 3 high-pressure hydrogen storage vessel, combining an aluminium liner which prevents gas diffusion and an overwrapped composite devoted to reinforce the structure. Today, this technique is widely used but still requires consistent time investments whenever a competitive solution, involving to definitely increase weight efficiency, is needed. The laminate composite is assumed to be an elasto-damage material whereas the liner behaves as an elasto-plastic material. Based on the classical laminate theory and on Hill's criterion to take into account the anisotropic plastic flow of the liner, the model provides an exact solution for stresses and strains on the Cylindrical Section of the vessel under thermomechanical static loading. Part I focuses on the theoretical background. The effect of the stacking sequence on the gap occurrence, on the residual stress magnitude and on the structure stiffness may then be investigated. This will be done and be compared with results of experiments which are carried out on prototypes in the second part of this paper before an optimization is performed.
D. Chapelle - One of the best experts on this subject based on the ideXlab platform.
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optimal design of a type 3 hydrogen vessel part i analytic modelling of the Cylindrical Section
International Journal of Hydrogen Energy, 2006Co-Authors: D. Chapelle, D. PerreuxAbstract:The present paper aims to study the Cylindrical Section of a Type 3 high-pressure hydrogen storage vessel, combining an aluminium liner which prevents gas diffusion and an overwrapped composite devoted to reinforce the structure. Today, this technique is widely used but still requires consistent time investments whenever a competitive solution, involving to definitely increase weight efficiency, is needed. The laminate composite is assumed to be an elasto-damage material whereas the liner behaves as an elasto-plastic material. Based on the classical laminate theory and on Hill's criterion to take into account the anisotropic plastic flow of the liner, the model provides an exact solution for stresses and strains on the Cylindrical Section of the vessel under thermomechanical static loading. Part I focuses on the theoretical background. The effect of the stacking sequence on the gap occurrence, on the residual stress magnitude and on the structure stiffness may then be investigated. This will be done and be compared with results of experiments which are carried out on prototypes in the second part of this paper before an optimization is performed.
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Optimal design of a Type 3 hydrogen vessel: Part I—Analytic modelling of the Cylindrical Section
International Journal of Hydrogen Energy, 2006Co-Authors: D. Chapelle, D. PerreuxAbstract:The present paper aims to study the Cylindrical Section of a Type 3 high-pressure hydrogen storage vessel, combining an aluminium liner which prevents gas diffusion and an overwrapped composite devoted to reinforce the structure. Today, this technique is widely used but still requires consistent time investments whenever a competitive solution, involving to definitely increase weight efficiency, is needed. The laminate composite is assumed to be an elasto-damage material whereas the liner behaves as an elasto-plastic material. Based on the classical laminate theory and on Hill's criterion to take into account the anisotropic plastic flow of the liner, the model provides an exact solution for stresses and strains on the Cylindrical Section of the vessel under thermomechanical static loading. Part I focuses on the theoretical background. The effect of the stacking sequence on the gap occurrence, on the residual stress magnitude and on the structure stiffness may then be investigated. This will be done and be compared with results of experiments which are carried out on prototypes in the second part of this paper before an optimization is performed.
Fengqin He - One of the best experts on this subject based on the ideXlab platform.
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experimental study of mini hydrocyclones with different vortex finder depths using particle imaging velocimetry
Separation and Purification Technology, 2020Co-Authors: Jianggang Wang, Shaofan Li, Hualin Wang, Fengqin He, Xiao XuAbstract:Abstract Characterization of flow field inside the hydrocyclone is helpful in optimizing hydrocyclone structure design. In this work, flow patterns in a mini-hydrocyclone with various vortex finder depths were studied with Particle Image Velocimetry (PIV). Axial velocity and radial velocity distributions of the central plane orthogonal to the inlet of mini-hydrocyclone were acquired, streamline diagrams were constructed from the measured vectors, and calculated from the experimental data. An analysis of the experimental data shows that the structural parameters of hydrocyclones have a critical impact on the flow field structure, and the experiment operation conditions only have an influence on strength of the flow fields. Vortex finder depth has a significant influence on the volume of the main separation zone and separation performance of mini-hydrocyclone. The optimal depth of the vortex finder was found to be a ratio of vortex finder depth to mini-hydrocyclone Cylindrical Section diameter L0/D of 1.0.
Charles A. Cain - One of the best experts on this subject based on the ideXlab platform.
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Experimental evaluation of a prototype Cylindrical Section ultrasound hyperthermia phased-array applicator
IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, 1991Co-Authors: Emad S. Ebbini, Charles A. CainAbstract:A prototype 64-element, 75 degrees Cylindrical-Section ultrasonic phased-array hyperthermia applicator has been designed and constructed. The ability of this applicator to focus ultrasonic energy at its geometric focus is verified in a water medium. The array is then driven by excitation vectors obtained using the pseudoinverse pattern synthesis method to generate shifted-focus and multiple-focus field patterns. Experimental results of single and multiple-focus patterns at 500 kHz are given and are in good agreement with theory. The results indicate that the main beam in single-focus patterns is generally insensitive to errors in the phases and amplitudes of the particle velocities of the array elements. The effect of such errors is largely exhibited in the sidelobes which, for all practical purposes, remain at levels acceptable for hyperthermia. This is true for both the geometric focus and shifted foci. >
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Adaptive 2D Cylindrical Section phased array system for ultrasonic hyperthermia
IEEE 1992 Ultrasonics Symposium Proceedings, 1Co-Authors: H. Wang, Emad S. Ebbini, Matthew O'donnell, R. Seip, Charles A. CainAbstract:A prototype 2D Cylindrical Section phased array, as part of an adaptive hyperthermia system, is used to examine the role of implantable acoustic sensors for phase aberration correction and motion compensation in ultrasound hyperthermia. After phase aberration correction and motion compensation, enhanced focal patterns are achieved even in the presence of significant aberration and motion. The limited number of acoustic sensors implanted inside a tumor in the clinic requires phase aberrations measured at one point to be extrapolated to other neighboring focal points. Significantly improved focal patterns can be obtained if phase aberrations and beam shifts are mainly caused by aberrators close to the array surface, and extrapolated focal points are close to measured points. >
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The pseudoinverse pattern synthesis method: experimental verification using a prototype Cylindrical-Section ultrasound hyperthermia phased-array applicator
Proceedings. IEEE Ultrasonics Symposium, 1Co-Authors: Emad S. Ebbini, Francis C. Ngo, Charles A. CainAbstract:A prototype 64-element, 75 degrees Cylindrical-Section ultrasonic phased-array hyperthermia applicator has been designed and constructed. The ability of this applicator to focus ultrasonic energy at its geometric focus was verified in a water medium. The array was then driven by excitation vectors obtained using the pseudoinverse pattern synthesis method to generate shifted-focus and double-focus field patterns. The measured intensity profiles agree well with the theoretically predicted ones. >
Richard Porter - One of the best experts on this subject based on the ideXlab platform.
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an example of non uniqueness in the two dimensional linear water wave problem involving a submerged body
Proceedings of The Royal Society A: Mathematical Physical and Engineering Sciences, 1998Co-Authors: D. V. Evans, Richard PorterAbstract:The non–uniqueness of the two–dimensional linearized water–wave problem was recently proved by McIver, who showed that there exist localized fluid motions between particular pairs of partly immersed cylinder Sections. In this paper it is shown how further examples of non–uniqueness can be constructed which include the presence of a submerged circular Cylindrical Section in addition to a pair of surface Cylindrical Sections. Further examples involving non–circular Sections are also presented.
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An example of non–uniqueness in the two–dimensional linear water–wave problem involving a submerged body
Proceedings of the Royal Society of London. Series A: Mathematical Physical and Engineering Sciences, 1998Co-Authors: D. V. Evans, Richard PorterAbstract:The non–uniqueness of the two–dimensional linearized water–wave problem was recently proved by McIver, who showed that there exist localized fluid motions between particular pairs of partly immersed cylinder Sections. In this paper it is shown how further examples of non–uniqueness can be constructed which include the presence of a submerged circular Cylindrical Section in addition to a pair of surface Cylindrical Sections. Further examples involving non–circular Sections are also presented.
