Browsing by Author "SCHAUB HAHN, THOMAS ANDREAS"
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Thesis DETERMINACIÓN POR MEDIO DE SIMULACIÓN NUMÉRICA DEL PERFIL DE DENSIDADES EN HIDRÓGENO EN ESTADO CRIOGÉNICO CON HAZ DE ELECTRONES COMO FUENTE DE CALOR(Universidad Técnica Federico Santa María, 2015) SCHAUB HAHN, THOMAS ANDREAS; SCHAUB HAHN, THOMAS ANDREAS; GERS , ROMAIN; Universidad Tecnica Federico Santa Maria UTFSM DEPARTAMENTO DE INGENIERÍA MECÁNICA; ROSALES HUERTA, CARLOS EDUARDOIn order to validate the results of the experiment "A double-target system for precision measurements of nuclear medium effects" lead by the Physics Department at Universidad Técnica Federico Santa María (Valparaíso, Chile) and performed at the Thomas Jefferson National Accelerator Laboratory (VA, USA) the density profile of liquid hydrogen has to be determined. Deviations over 2% are not acceptable compared to the initial conditions. The liquid flows induced by natural convection due to the interaction with an electron beam. Because of restrictions imposed by the experimental conditions, direct density measurements are not feasible. In past experiments, bubble formation due to boiling was observed. A 2D CFD simulation is proposed and performed on ANSYS Fluent. Two multiphase models are used: Mixture and Euler RPI. The Mixture model differs from the actual physics involved in the problem and is ruled out. The results are presented for the Euler RPI model. The calculated velocity field is laminar and, due to the characteristics of the numerical results, it is possible to presume an irregular periodicity and a slightly chaotic behavior of the flow. The numerical results show a reduced vapor production on the exact same areas, where bubble formation due to boiling was observed in past experiments. The vapor volume fraction for vapor is negligible along the electron beam, but not in the whole domain though. A maximum deviation of 3.3% and an average of 1.4% are calculated for liquid hydrogen along the electron beam. A method is proposed to calculate the required inlet temperature for liquid hydrogen in order to avoid nucleate boiling in the target with good preliminary results. However, these results must be numerically and experimentally validated.
