The goal of this master thesis is to investigate the possibility to build a representative mock up which allows the investigation of different natural circulation flow patterns.
At first the phenomena important for the natural circulation cooling shall be identified and quantified with relevant non-dimensional numbers. Based on these numbers a simplified mock up shall be sketched which allows a flexible positioning of heat sources and sinks.
Finally, a CFD model of the mock up shall be constructed to make an evaluation of the flow patterns and the stability with respect to the relative positions of the sources and sinks.
An in-depth investigation of the different modelling options (boundary conditions, turbulence, mesh), geometry and properties (porosity, power) should allow to estimate the key parameters of the natural circulation cooling and to generate a stability map of the installation.
-literature study on natural circulation in pool type reactors (recent updates)
-determining relevant non-dimensional numbers and sketch a representative mock up based on scaling
-modelling the designed mock up within a general purpose CFD code (ANSYS CFX or Fluent)
-investigating the key parameters for the positioning of the heat sources and sinks
-analyzing the results
-evaluation of the safety significance
-reporting of the work performed.
This thesis requires some experience with computational fluid dynamics. Insight into physics and thermal hydraulics
The student should have affinity to computer work, be persistent and precise.