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You searched for subject:(cryogenic tank). Showing records 1 – 3 of 3 total matches.

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Mississippi State University

1. de Quay, Laurence. VALIDATED PREDICTION OF PRESSURANT GAS REQUIREMENTS IN CRYOGENIC RUN TANKS AT SUBCRITICAL AND SUPERCRITICAL PRESSURES.

Degree: PhD, Mechanical Engineering, 2009, Mississippi State University

The development, testing, and use of liquid propellant and hybrid rocket propulsion systems for spacecraft and their launch vehicles routinely involves the use of cryogenic propellants. These propellants provide high energy densities that enable high propulsive efficiency and high engine thrust to vehicle weight ratios. However, use of cryogenic propellants also introduces technical problems not associated with other types of propellants. One of the major technical problems is the phenomenon of propellant tank pressurant and ullage gas collapse. This collapse is mainly caused by heat transfer from most of the ullage gas to tank walls and interfacing propellant, which are both at temperatures well below those of this gas. Pressurant gas is supplied into cryogenic propellant tanks in order to initially pressurize these tanks and then to maintain required pressures as propellant is expelled from these tanks. The cryogenic propellants expelled from the tanks feed rocket engine assemblies, subassemblies, and components at required interface pressures and mass flow rates. The net effect of pressurant and ullage gas collapse is increased total mass and mass flow rate requirements of pressurant gases. For flight vehicles this leads to significant and undesirable weight penalties. For rocket engine component and subassembly ground test facilities this results in high construction and operational cost impacts. Accurate predictions of pressurant gas mass transfer and flow rate requirements are essential to the proper design of systems used to supply these gases to cryogenic propellant tanks. While much work has been done in the past for predicting these gas requirements at low subcritical tank pressures, very little has been done at supercritical tank pressure conditions and there are selected cases where errors of analytical predictions are high. The objectives of this study are to develop a new generalized and improved computer program to determine pressurant gas requirements at both subcritical and supercritical tank pressure conditions, and then evaluate and validate the consistent accuracy of this program over a wide range of conditions by comparison of program results to empirical data. Advisors/Committee Members: Dr. Pedro Mago (committee member), Dr. Rogelio Luck (committee member), Dr. George A. Adebiyi (committee member), Dr. B. Keith Hodge (chair).

Subjects/Keywords: cryogenic; liquid propellant; ullage collapse; run tank; cryogenic tank; collapse factor

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

de Quay, L. (2009). VALIDATED PREDICTION OF PRESSURANT GAS REQUIREMENTS IN CRYOGENIC RUN TANKS AT SUBCRITICAL AND SUPERCRITICAL PRESSURES. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-11052009-141336/ ;

Chicago Manual of Style (16th Edition):

de Quay, Laurence. “VALIDATED PREDICTION OF PRESSURANT GAS REQUIREMENTS IN CRYOGENIC RUN TANKS AT SUBCRITICAL AND SUPERCRITICAL PRESSURES.” 2009. Doctoral Dissertation, Mississippi State University. Accessed October 19, 2019. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11052009-141336/ ;.

MLA Handbook (7th Edition):

de Quay, Laurence. “VALIDATED PREDICTION OF PRESSURANT GAS REQUIREMENTS IN CRYOGENIC RUN TANKS AT SUBCRITICAL AND SUPERCRITICAL PRESSURES.” 2009. Web. 19 Oct 2019.

Vancouver:

de Quay L. VALIDATED PREDICTION OF PRESSURANT GAS REQUIREMENTS IN CRYOGENIC RUN TANKS AT SUBCRITICAL AND SUPERCRITICAL PRESSURES. [Internet] [Doctoral dissertation]. Mississippi State University; 2009. [cited 2019 Oct 19]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11052009-141336/ ;.

Council of Science Editors:

de Quay L. VALIDATED PREDICTION OF PRESSURANT GAS REQUIREMENTS IN CRYOGENIC RUN TANKS AT SUBCRITICAL AND SUPERCRITICAL PRESSURES. [Doctoral Dissertation]. Mississippi State University; 2009. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11052009-141336/ ;

2. Masad, Noor Ahmad. Meso-Scale Model for Simulations of Concrete Subjected to Cryogenic Temperatures.

Degree: 2013, Texas A&M University

Liquefied natural gas (LNG) is stored at a cryogenic temperatures ? -160?C and around atmospheric pressure to insure the minimum storage volume in tanks. The demand for LNG has been increasing as a primary source of energy. Therefore, there is significant interest in the construction of LNG tanks to achieve low cost and safe storage. Three systems are typically used to store LNG: single containment, double containment, and full containment. Concrete is used in these containment systems, and consequently, understanding concrete behavior and properties at cryogenic temperatures is important. The research documented in this thesis deals with computational analysis of the behavior of concrete subjected to cryogenic temperatures. The analysis focuses on the effect of aggregate sizes, coefficient of thermal expansion, volume fraction, and the shape of aggregate on damage of concrete subjected to cryogenic temperatures. The analysis is performed by developing a computational model using the finite element software ABAQUS. In this model, concrete is considered as a 3- phase composite material in a meso-scale structure: mortar matrix, aggregate, and interfacial transmission zone (ITZ). The Concrete Damage Plasticity model in ABAQUS is used to represent the mortar and ITZ phases of concrete. This model has the advantage of accounting for the effect of temperature on material properties. The aggregate phase is modeled as a linear-elastic material. The model parameters are selected based on comprehensive literature review of material properties at different temperatures. The finite element results provide very useful insight on the effects of concrete mixture design and properties on resistance to damage. The most important factor that affected damage development was the difference in the coefficient of thermal expansion between the mortar and aggregates. Models in which the mortar and aggregate had close values of positive coefficients experienced less damage. The model with irregular shape particles experienced more localized damage than the model with circular shape particles. The model was successful in demonstrating the effect of using air entrained concrete in reducing damage. The damage results predicted by the model for air entrained and non-air entrained concrete are validated by comparing them with experimental data from the literature. The analysis validated the capabilities of the mode in simulating the effect of reduction in temperature on damage. The modeling results and the findings from the literature review were used to put forward recommendations regarding the characteristics of concrete used in LNG storage. Advisors/Committee Members: Zollinger, Dan (advisor), Jones, Harry (committee member), El-Halwagi, Mahmoud (committee member).

Subjects/Keywords: cryogenic concrete; concrete properties; concrete plasticity damaged model; Liquefied natural gas tank

…LIST OF FIGURES FIGURE Page 2.1 LNG tank: (a) single containment tank and… …x28;b) full containment tank. ............... 7 2.2 The effect of low temperatures on… …of thermal expansion of dry/wet concrete versus cryogenic temperatures… …stored at cryogenic temperatures and around the atmospheric pressure to insure safe and minimum… …impact positively the economy of the gas producing companies and countries. A typical LNG tank… 

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Masad, N. A. (2013). Meso-Scale Model for Simulations of Concrete Subjected to Cryogenic Temperatures. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/151228

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Masad, Noor Ahmad. “Meso-Scale Model for Simulations of Concrete Subjected to Cryogenic Temperatures.” 2013. Thesis, Texas A&M University. Accessed October 19, 2019. http://hdl.handle.net/1969.1/151228.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Masad, Noor Ahmad. “Meso-Scale Model for Simulations of Concrete Subjected to Cryogenic Temperatures.” 2013. Web. 19 Oct 2019.

Vancouver:

Masad NA. Meso-Scale Model for Simulations of Concrete Subjected to Cryogenic Temperatures. [Internet] [Thesis]. Texas A&M University; 2013. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/1969.1/151228.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Masad NA. Meso-Scale Model for Simulations of Concrete Subjected to Cryogenic Temperatures. [Thesis]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/151228

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Delft University of Technology

3. Geuskens, F.J.J.M.M. Conformable Pressurized Structures: Design and Analysis.

Degree: 2012, Delft University of Technology

There are many applications where volume needs to be pressurised within a geometrical space for which conventional pressure vessels do not provide suitable solutions. Applications are for example found in pressure cabins for Blended Wing Body Aircraft and conformable pressure vessels for an incompressible medium that has to be stored in a pressurised environment, specifically liquid gasses (e.g. propane) or cryogenic applications. These applications demand conformable pressurised structures but up until now, there are no conformable pressurised structures with full spatial freedom, made from high specific strength materials and optimal structural efficiency realised yet. The aim of this thesis is to provide understanding in the analysis and structural design of conformable pressurized structures. This thesis will enable the development of conformable pressure cabins and pressure vessels. From a structural topology point of view, efficient structures are in-plane, rather than out-of-plane, loaded structures. In this thesis, it is shown by means of linear membrane analysis that any arbitrary combination of intersecting axi-symmetrical membrane structures will always carry the pressurization loads via in-plane stresses provided that there is a proper in-plane loaded reinforcement at the surface of intersection. The most well-known example of a structure like this is a cluster of soap bubbles. In this example, the axi-symmetrical membrane structure is a sphere and the intersecting walls are the in-plane loaded reinforcements. This type of conformable pressure vessel is therefore called the multi-bubble. Simple shapes like intersecting spheres, intersecting cylinders or intersecting toroids are easy to analyse but the analysis becomes complex when different types of axi-symmetric elements are intersecting each other. This problem has been tackled by the visual interpretation of the linear membrane theory. To solve for loads and forces in the multi-bubble, it is shown that the solution simply depends on pressure and geometric variables. The solution is only valid however when the shell has the optimal stiffness distribution. The optimal stiffness distribution causes the inflated shape to be identical to the original shape, only the size is different. The optimal stiffness distribution is derived in this thesis. Manufacturing restrictions and cost limitations might cause the optimal stiffness distribution not to be economically feasible. A non-optimal stiffness distribution causes a nonlinear membrane response. A modified linear membrane solution for orthotropic membranes is derived in this thesis to solve for forces and deformations in non-optimal membranes. Furthermore, the understanding of the membrane response of pressurised structures also enables the formulation of a tailored stiffness distribution in order to control/eliminate deformations in particular directions. This can ease the integration of the pressurized structure in the surrounding structure. The achievements of this research can be summarized into: .… Advisors/Committee Members: Beukers, A..

Subjects/Keywords: conformable; multi-lobe; multi-bubble; pressure vessel; pressure tank; pressure cabin; pressure fuselage; Blended Wing Body; cryogenic tanks; modified linear membrane analysis; CHATT

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Geuskens, F. J. J. M. M. (2012). Conformable Pressurized Structures: Design and Analysis. (Doctoral Dissertation). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:67fa0d80-98a9-4041-8d68-29a3ada4bd2a ; urn:NBN:nl:ui:24-uuid:67fa0d80-98a9-4041-8d68-29a3ada4bd2a ; urn:NBN:nl:ui:24-uuid:67fa0d80-98a9-4041-8d68-29a3ada4bd2a ; http://resolver.tudelft.nl/uuid:67fa0d80-98a9-4041-8d68-29a3ada4bd2a

Chicago Manual of Style (16th Edition):

Geuskens, F J J M M. “Conformable Pressurized Structures: Design and Analysis.” 2012. Doctoral Dissertation, Delft University of Technology. Accessed October 19, 2019. http://resolver.tudelft.nl/uuid:67fa0d80-98a9-4041-8d68-29a3ada4bd2a ; urn:NBN:nl:ui:24-uuid:67fa0d80-98a9-4041-8d68-29a3ada4bd2a ; urn:NBN:nl:ui:24-uuid:67fa0d80-98a9-4041-8d68-29a3ada4bd2a ; http://resolver.tudelft.nl/uuid:67fa0d80-98a9-4041-8d68-29a3ada4bd2a.

MLA Handbook (7th Edition):

Geuskens, F J J M M. “Conformable Pressurized Structures: Design and Analysis.” 2012. Web. 19 Oct 2019.

Vancouver:

Geuskens FJJMM. Conformable Pressurized Structures: Design and Analysis. [Internet] [Doctoral dissertation]. Delft University of Technology; 2012. [cited 2019 Oct 19]. Available from: http://resolver.tudelft.nl/uuid:67fa0d80-98a9-4041-8d68-29a3ada4bd2a ; urn:NBN:nl:ui:24-uuid:67fa0d80-98a9-4041-8d68-29a3ada4bd2a ; urn:NBN:nl:ui:24-uuid:67fa0d80-98a9-4041-8d68-29a3ada4bd2a ; http://resolver.tudelft.nl/uuid:67fa0d80-98a9-4041-8d68-29a3ada4bd2a.

Council of Science Editors:

Geuskens FJJMM. Conformable Pressurized Structures: Design and Analysis. [Doctoral Dissertation]. Delft University of Technology; 2012. Available from: http://resolver.tudelft.nl/uuid:67fa0d80-98a9-4041-8d68-29a3ada4bd2a ; urn:NBN:nl:ui:24-uuid:67fa0d80-98a9-4041-8d68-29a3ada4bd2a ; urn:NBN:nl:ui:24-uuid:67fa0d80-98a9-4041-8d68-29a3ada4bd2a ; http://resolver.tudelft.nl/uuid:67fa0d80-98a9-4041-8d68-29a3ada4bd2a

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