Thesis (Ph. D.)--University of Wisconsin--Madison, 1957. / Typescript. Abstracted in Dissertation abstracts, v. 17 (1957) no. 10, p. 2238-2239. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves [135]-[136]).

Thesis (Ph. D.)--University of Wisconsin, 1967. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliography.

Thesis (Ph.D.)--Hong Kong University of Science and Technology, 2005. / Includes bibliographical references (leaves 116-124). Also available in electronic version.

Thesis (MTech (Chemical Engineering))--Cape Peninsula University of Technology, 2009. / Emulsion explosives are classified as highly concentrated water-in-oil emulsions with high droplet volume fraction that exceeding the close packing limit of spherical droplets. These emulsions are commonly used as re-pumpable materials. Thus, the shearing action resulting from the transportation process of these materials has a tremendous impact on their structures and functionality and might reduce the shelf-life and performance of the products. Therefore the main goal of this research was to investigate the stability of highly concentrated water-in-oil emulsion under shearing using a newly designed piston-pumping instrument. The results of measurement included the droplet size distribution, microscopic observation, flow and viscoelastic properties of the materials. Neither crystallisation nor other destabilisation phenomena such as coalescence, partial coalescence, or phase inversion occurred during the shearing process of these emulsions, regardless of their formulation content. It was found that the high shearing action within this research experimental window induced droplet refinement. The changes in droplet size distribution were achieved by multipass flow through a small orifice set as outlet of the piston-chamber pumping instrument, and intensive shearing provided the shift of the droplet sizes to the smaller-size side of the distribution. Their distributions were wider and of Gaussian type. Two models were proposed and used to fit the refinement evolution and the width of distributions respectively.

No description available.

A theoretical study of the approach and collision of liquid-drop pairs is performed with results obtained numerically. The collision process is modeled by a squeeze-flow problem involving both planar and non-planar geometry, with attention given to the deformation of the interacting interfaces. Based on the nature of the collision process, an analogy is made between the fluidic systems of colliding liquid bodies and a mechanical mass- spring-damper system. Examination of the analogous mechanical system yields the derivation of an effective damping ratio, ζ*, which is used to predict the outcome of the drop-drop collisions. Predictions made by utilizing the effective damping ratio are then compared to experimental results presented in literature. / text

No description available.

Développer une méthode de caractérisation théorique complète d'un spray sur base de la connaissance du mécanisme de formation des gouttes et pouvant être appliquée de façon similaire quel que soit le type de spray, constitue l'axe central de la présente recherche. La difficulté principale étant la connaissance de la physique de rupture de la nappe liquide en gouttelettes, l'étude entreprise s'est attachée à la description du spray ultrasonique, qui a l'avantage d'impliquer un mécanisme de formation d'ondes de surface (ondes de Faraday) largement étudié. Les moyens mis en oeuvre pour trouver la loi de distribution théorique qui décrit au mieux la pulvérisation ultrasonique sont, d'un côté, l'analyse de l'instabilité des ondes de surface, qui permet de déterminer les caractéristiques moyennes du spray, et de l'autre, une méthode stochastique, le formalisme de l'entropie maximale, qui fournit la distribution la plus probable basée sur les caractéristiques moyennes et sur les lois de conservation élémentaires applicables à tout type de pulvérisation (conservation de la masse et de l'énergie). La validation expérimentale de cette nouvelle approche théorique a permis en outre de développer de nouveaux designs de pulvérisateurs performants.// To develop a method of complete theoretical characterization of a spray based on the knowledge of the of droplet formation mechanism and being able to be applied in a similar way whatever the type of spray, constitute the central axis of this research. The main difficulty being the knowledge of the physics of liquid film break-up into droplets, the study undertaken was concerned with the description of the ultrasonic spray, which has the advantage of implying a mechanism of formation of surface waves (Faraday waves) largely studied. The means implemented to find the theoretical droplet size distribution which describes ultrasonic atomization as well as possible are, first, analysis of surface waves instability, which allows to determine the average characteristics of the spray, and then, a stochastic method, the maximum entropy formalism, which provides the most probable distribution based on the average characteristics and the elementary laws of conservation applicable to any type of atomization (mass and energy conservation). The experimental validation of this new theoretical approach made it possible moreover to develop new designs of powerful ultrasonic atomizers.

No description available.

Thesis (M.S.)--West Virginia University, 2001. / Title from document title page. Document formatted into pages; contains xii, 113 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 95-98).