Wuppertal, Universiẗat, Diss., 2002.

LPG is a very important fuel and chemical feed stock as well.¡@The hydrocarbon has been involved in many major fires and explosions. One of these incidents is boiling-liquid, expanding-vapor explosion (BLEVE). It is a phenomenon that results from the sudden release from confinement of a liquid at a temperature above its atmospheric-pressure boiling point. The sudden decrease in pressure results in the explosive vaporization of a fraction of the liquid and a cloud of vapor and mist with the ccompanying blast effects.¡@Most BLEVEs involve flammable liquids, and most BLEVE releases are ignited by surrounding fire and result in a fireball. The objective of this study is to develop computer model in order to determine the thermal response of LPG tanks involved in fire engulfment accidents. The assessment of protection measures, including safety spacing between tanks, water spray cooling, and prediction of tank failure, were analyzed. The risk associated with the thermal radiation due to BLEVE of the LPG tank was analyzed.¡@The model used in this work can be applied to safety/reliability assessment of other pressure-liquefied-gas (PLG) tanks, such as ethylene, ammonia, and so forth.

Thesis (M.S. in Computer Science)--Naval Postgraduate School, September 2002. / Thesis advisor(s): Richard Riehle, Michael Carney. Includes bibliographical references (p. 43). Also available online.

Thesis (M.S.)--University of Wisconsin--Madison. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaf 31).

Thesis (Ph. D.)--West Virginia University, 2000. / Title from document title page. Document formatted into pages; contains xxv, 246 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 162-168).

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3 pp. / Originally published: 2000

Mixing in stirred tanks influences conversion of reactants for fast reactions, and the efficiency of a mixing process can be determined from the power consumption and mixing time, which are the two parameters that define homogenization energy. In this study, the computational fluid dynamics (CFD) and laser Doppler velocimetry (LDV) techniques were employed to study the effect of the Rushton turbine bottom clearance on the flow field, mixing time and power consumption in a stirred tank. Experimental and simulation studies were conducted in a tank with and without a draft tube where a conductivity meter and decolourization methods were employed in validating the mixing time simulation results. A good agreement between the experimental and simulation results for the flow field and mixing time was obtained. The results showed a reduction in mixing time and power consumption at a low impeller clearance, with reference to the standard clearance, and a further reduction of the same parameters was obtained for a system fitted with a draft tube. At the low clearance, there was an increase in mixing efficiency by 46%, for a system without draft tube and 61% for that with the draft tube.