Experimental investigation of alternative structures in coalescence filters to influence drainage and entrainment mechanisms

Oil mist filters are used to separate oil droplets from gas streams, for example in compressed air deoiling. They have a multi-layer structure and consist of a coalescence layer, a support structure, and a downstream drainage layer. Oil droplets are separated in the coalescence layer, coalesce into larger liquid structures, and are discharged via preferred flow paths. The support structure ensures the mechanical stability of the filter, while the drainage layer supports the drainage of the separated oil. However, depending on the filter design and operating conditions, various mechanisms can cause oil droplets to be reintroduced (entrainment) into the clean gas stream at the rear of the filter.

The aim of this master's thesis is to experimentally investigate the influence of alternative structural concepts, e.g., metal foams in the area of the support structure and drainage layer, on drainage and entrainment mechanisms in oil-loaded coalescence filters. In particular, the aim is to analyze the extent to which modified structural properties and defined interstices within the filter structure influence fluid flow, droplet formation, and the re-entry of oil droplets into the clean gas stream.

To this end, different structural concepts in the area of support structures and drainage layers will be implemented and experimentally compared with a reference structure. The filters will be operated under defined operating conditions and examined in terms of drainage behavior, differential pressure, and entrainment. The analysis is carried out both visually, using video recordings to observe liquid distribution and droplet formation, and quantitatively, by measuring the particle number concentration in the clean gas and the amount of liquid flowing out. The aim is to systematically evaluate the influence of alternative structures on the relevant mechanisms and to derive approaches for reducing entrainment in coalescence filters.

What I can offer you:

• Experience in supervising theses, so I know the extent of support and demands necessary in the project to achieve exciting and successful results
• Regular contact with my students to supervise them and provide support in case of problems
• Freedom for your own ideas in the final project

Your tasks will include:

• Creating and following up on a project plan for the thesis
• Implementation, evaluation, and comparison of different methods
• Comparing the results obtained with known literature values

What you should bring to this work:

• Interest in the subject area and enjoyment of theoretical and experimental work
• Ability to communicate, work in a goal-oriented manner, and be flexible and proactive
• Degree program: CIW/VT, BIW, MACH, computer science, mathematics

If you are interested in this work, I would be happy to hear from you. I would be happy to tell you more about the topic in a conversation.

Contact information:
Robin Mandic, M.Sc.
Email: robin.mandic∂kit.edu

Tel.: +49 721 608-42416
Straße am Forum 8
Building 30.70, Room 107
76131 Karlsruhe