Master Thesis - CFD two-phase bubble flow in kettles*

[Pullach by Munich]

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.
Task:
  • 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

Why you will love working at Linde:

Linde acts responsibly towards its shareholders, business partners, employees, society and the environment in every one of its business areas, regions and locations across the globe. The company is committed to technologies and products that unite the goals of customer value and sustainable development.

Linde AG, Engineering Division
Frau Julia Specht
Tel. +49 89 7445 4464

*Any designations used of course apply to persons of all genders. The form of speech used here is for simplicity only.

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