What you will enjoy doing:Background:
- For the design of kettles, the exact knowledge of the two-phase flow height is crucial to ensure a continuous moistening of the tubes and provide sufficient gas volume above the two-phase bubble layer to minimize droplet entrainment.
- Current design methods are conservative and lead to large and expensive heat exchangers.
- Due to the complexity of the boiling mechanism conventional CFD methods are not able to predict the two-phase bubble flow height at economically justifiable effort.
- New methods of the simulation tool OpenFOAM combine the advantages of an euler-euler approach (bubble flow) with the volume of fluid method (liquid surface) in a hybrid model.
- This hybrid model shows high potential to predict the two-phase bubble flow height with sufficient accuracy at reasonable effort.
- Literature survey in respect to simulation of boiling fluids
- Familiarization with the hybrid model, setup and validation of academic test cases from literature
- Simulation of a quasi-two-dimensional segment of an industrial scale kettle
- Investigate influence of the bubble size, heat-flux and media (e.g. water and hydrocarbons) on the two-phase bubble flow height
- Derivation of prediction methods for the design of a kettle based on the CFD results
What makes you great :
- Student (m/f) of chemical/process/mechanical engineering or related field of study with very good academic results and very good knowledge of German or English language
- Sound knowledge in the fields of thermodynamics, fluid dynamics and tow phase flow
- Experience with CFD solver OpenFOAM