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We are looking for an ambitious and innovative graduate student to join our fluid mechanics team at AFRY to conduct a master thesis. 

The aim of the master thesis is to develop a 1-D model of a spiral evaporator. At the inlet of the evaporator, atomized liquid and cold air is feed into the evaporator spiral. The outer walls of the spiral duct are heated by electric wires. Heat is then transferred to the evaporator channel through the outer walls. The accurate prediction of evaporator performance is important to have a good aseptic performance of the package machines.

The thesis is carried out in collaboration with Tetra Pak

The simulation model will be a 1-D model that will be developed in MATLAB or similar tools such as Python.

The focus of the model is to predict the fluid film evaporation, heat transfer between evaporator wall, fluid film and gas and model the non-ideal H2O/H2O2 evaporation.

The simulation results will be compared with measurements from experiments and literature.

The master thesis will mainly take place at AFRY's office in Gothenburg with some visits to Tetra Pak's office in Lund. Remote work can take place if the work tasks allow it.

You are a master of science student within either the following fields: Chemical Engineering, Mechanical engineering or physical engineering 

Physical phenomena that will be included in the Master Thesis:

• Heat transfer from wall to liquid film and gas and droplets
• Mass transfer (evaporation) from liquid film to gas for a non-ideal solution of water (H2O) and hydrogen peroxide (H2O2).
• Mass transfer (evaporation) from droplets to gas for a non-ideal solution of water (H2O) and hydrogen peroxide (H2O2).
• Radiative transfer between fluid film, droplets walls and gas
• Impingement and stripping of droplets to and from fluid film on the inner evaporator walls.

Planning of degree projects

• The thesis starts with a literature study of two-three weeks on how modelling of fluid film evaporation, optically thick gases and fluid film momentum transport, and impingement and stripping of droplets from fluid film.
• A (one-dimensional) model of the evaporator (solving heat, momentum and mass transfer) is then built in Matlab or similar tools such as Python.
• The simulation model is compared with experimental data.
• The verified model is then used for modelling the sensitivity of the system with respect to various changes in the geometry (increased coil length, smaller diameter of coil etc).

• Compilation of results and report writing of the master thesis as well as production of power-point presentation for presentation of the degree project.

Time span for degree project:

January 2024 – July 2024

Contacts:

Christoffer Källerman

[email protected]

Application deadline

10 December

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