Chehade, Pablo N. (2023) Dinmica de una burbuja de cavitacin lser / Dynamics of a laser cavitation bubble. Maestra en Ciencias Fsicas, Universidad Nacional de Cuyo, Instituto Balseiro.
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Resumen en espaol
Se analiz numricamente la dinmica de una burbuja de cavitacin lser desde su formacin hasta el momento de mxima expansin y posterior compresin. Se identificaron dos etapas en la evolucin de la burbuja, cada una gobernada por fenmenos fsicos distintos. Durante la primera etapa, un lser de alta potencia incide en un medio lquido, generando una burbuja de cavitacin. Luego, esta burbuja se expande hasta un radio mximo. Este proceso es de origen electrosttico, termodinmico y fluidodinmico. En la actualidad existe un modelo que describe fenomenolgicamente esta etapa. En este trabajo se ha formalizado y cuantificado el modelo con el objetivo de capturar efectos importantes, como la relacin entre el radio mximo de la burbuja y la potencia del lser incidente. Ambos modelos presuponen la existencia de microburbujas de gas estables en el medio lquido. La segunda etapa involucra la compresin de la burbuja hasta un radio mnimo. Este proceso es de origen termodinmico y fluidodinmico. Se desarroll e implement el modelo que explica esta dinmica, considerando una amplia variedad de efectos fsicos. Este modelo se compone de un conjunto de ecuaciones diferenciales acopladas que conforman un problema de tipo stiff. Se exploraron diversos mtodos numricos y tcnicas de resolucin computacionales. Se obtuvo la evolucin del radio de la burbuja, la presin, la temperatura y la concentracin de distintas especies qumicas bajo condiciones iniciales especificas. Luego, con el objetivo de validar el cdigo, se compararon los resultados con los obtenidos mediante una implementacin previa realizada y experimentalmente validada en el Laboratorio de Cavitacin y Biotecnologa. Adicionalmente, se investig la posibilidad de que ocurran reacciones nucleares D-D en el momento de mxima compresin de la burbuja, instante en el que se forma un plasma con valores relativamente altos de densidad y temperatura.
Resumen en ingls
The dynamics of a laser cavitation bubble from its formation to the moment of maximum expansion and subsequent compression were numerically analyzed. Two stages in the bubble’s evolution were identified, each governed by different physical phenomena. During the first stage, a high-power laser impacts a liquid medium, generating a cavitation bubble. Then, this bubble expands to a maximum radius. This process is electrostatic, thermodynamic, and fluid dynamic in nature. Currently, there is a model that phenomenologically describes this stage. This work formalized and quantified the model to capture important effects, such as the relationship between the bubble’s maximum radius and the incident laser power. Both models presuppose the existence of stable gas microbubbles in the liquid medium. The second stage involves the compression of the bubble to a minimum radius. This process is thermodynamic and fluid dynamic in origin. A model explaining this dynamics was developed and implemented, considering a wide variety of physical effects. This model consists of a set of coupled differential equations forming a stiff-type problem. Various numerical methods and computational resolution techniques were explored. The evolution of the bubble’s radius, pressure, temperature, and concentration of different chemical species under specific initial conditions were obtained. Then, to validate the code, the results were compared with those obtained through a previous implementation that was experimentally validated at the Laboratory of Cavitation and Biotechnology. Additionally, the possibility of D-D nuclear reactions occurring at the moment of maximum bubble compression, when a plasma with relatively high density and temperature values is formed, was investigated.
| Tipo de objeto: | Tesis (Maestra en Ciencias Fsicas) |
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| Palabras Clave: | Thermodynamics; Termodinmica; Laser cavities; Cavidades de lser; [Numerical study; Estudio numrico; High power laser; Lser de alta potencia; Electrostatic; Electroesttica] |
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| Materias: | Fsica > Interaccin de la radiacin con la materia |
| Divisiones: | Gcia. de rea de Energa Nuclear > Gcia. de Ingeniera Nuclear > Cavitacin y biotecnologa |
| Cdigo ID: | 1237 |
| Depositado Por: | Marisa G. Velazco Aldao |
| Depositado En: | 24 Abr 2024 12:54 |
| ltima Modificacin: | 24 Abr 2024 12:54 |
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