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You searched for +publisher:"Mississippi State University" +contributor:("Dr. George A. Adebiyi"). Showing records 1 – 2 of 2 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 (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 November 15, 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. 15 Nov 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 Nov 15]. 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/ ;


Mississippi State University

2. Kung, Chea-Chun. Condensation Heat Transfer in Horizontal Micro-fin Tubes.

Degree: MS, Mechanical Engineering, 2002, Mississippi State University

Three existing condensation heat transfer models are validated using 544 experimental data points for pure refrigerants and refrigerant mixtures. The Cavallini et al. (1999) model predicts well with the pure-refrigerant data sets. However, the Cavallini et al. (1999) model fails to predict the refrigerant-mixture data sets. The Yu and Koyama (1998) model, which is applicable for the pure refrigerants only, fails to predict most of the R22 data sets. The Kedzierski and Goncalves (1999) model, which is applicable for both pure refrigerants and refrigerant mixtures, yields relatively high mean absolute deviations for most of the pure-refrigerant data sets. The Kedzierski and Goncalves (1999) model does not account for the mass transfer thermal resistance in refrigerant mixtures. A new pure-refrigerant model and a new refrigerant-mixture semi-empirical model have been developed. Both the new models successfully predict the experimental data for pure refrigerant and for refrigerant mixtures. Advisors/Committee Members: Dr. Louay Chamra (chair), Dr. B. Keith Hodge (committee member), Dr. George A. Adebiyi (committee member), Dr. Carl A. James (committee member).

Subjects/Keywords: condensation heat transfer; horizontal micro-fin tubes

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

APA (6th Edition):

Kung, C. (2002). Condensation Heat Transfer in Horizontal Micro-fin Tubes. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-11112002-124247/ ;

Chicago Manual of Style (16th Edition):

Kung, Chea-Chun. “Condensation Heat Transfer in Horizontal Micro-fin Tubes.” 2002. Masters Thesis, Mississippi State University. Accessed November 15, 2019. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11112002-124247/ ;.

MLA Handbook (7th Edition):

Kung, Chea-Chun. “Condensation Heat Transfer in Horizontal Micro-fin Tubes.” 2002. Web. 15 Nov 2019.

Vancouver:

Kung C. Condensation Heat Transfer in Horizontal Micro-fin Tubes. [Internet] [Masters thesis]. Mississippi State University; 2002. [cited 2019 Nov 15]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11112002-124247/ ;.

Council of Science Editors:

Kung C. Condensation Heat Transfer in Horizontal Micro-fin Tubes. [Masters Thesis]. Mississippi State University; 2002. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11112002-124247/ ;

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