PhD scholarship in Microchannel Two-Phase Flow Cooling of Power Modules

DTU Mechanical Eng
Monday 18 Sep 17

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The Technical University of Denmark (DTU), Department of Mechanical Engineering has an open PhD position on microchannel two-phase flow cooling of power modules. The position will address work on both numerical modelling of the heat transfer, optimizing the geometry and design of the microchannels and experimental validation. The PhD project is part of the COOLMOD project and carried out in collaboration with the Royal Institute of Technology (KTH) and industrial partners: Danfoss Silicon Power and Danfoss Drives.

Power modules are the heart of many renewable energy technologies such as wind turbines, solar power plants and electric vehicles, and play an important role in reaching worldwide climate targets. The objective of the COOLMOD project is to enhance the cooling performance in power modules by using two-phase flow boiling in microchannels with and without nano-porous wall structures. Compared with state-of-the-art single-phase liquid power modules, the two-phase flow is expected to enhance the cooling performance (the effective heat transfer coefficient) by more than 4 times with microchannels alone and 8 times including optimized nano-porous wall structures, which intensifies bubble nucleation.

Besides a solid background within refrigeration, heat transfer, thermo- and fluid dynamics, the position requires good cooperation capabilities, since the development of the microchannels, nanostructure and test apparatus will be carried out in close cooperation with the refrigeration group at DTU and KTH and the industrial partners.

Responsibilities and tasks  

  • Steady state numerical modelling and heat transfer optimization of microchannels.
  • Participation in the design of the test rig incl. an infrared camera for local chip temperature measurement and high-speed camera for visualization of the two-phase flow boiling and distribution into the microchannels.
  • Experimental validation incl. data reduction, calibration, analysis and interpretation, development of flow boiling correlations and adding nano-porous surfaces into the microchannels during an external stay at KTH.

Candidates should have a master's degree in engineering or a similar degree with an academic level equivalent to the master's degree in engineering.

Approval and Enrolment
The scholarship for the PhD degree are subject to academic approval, and the candidates will be enrolled in one of the general degree programmes of DTU. For information about the general requirements for enrolment and the general planning of the scholarship studies, please see the DTU PhD Guide.   

The assessment of the applicants will be made by Senior Researcher Martin Ryhl Kærn and Associate Professor Wiebke Brix Markussen.

We offer
DTU is a leading technical university globally recognized for the excellence of its research, education, innovation and scientific advice. We offer a rewarding and challenging job in an international environment. We strive for academic excellence in an environment characterized by collegial respect and an academic freedom tempered by responsibility.   

Salary and appointment terms
The appointment will be based on the collective agreement with the Danish Confederation of Professional Associations. The allowance will be agreed with the relevant union. The period of employment is 3 years.

Further information
Further information may be obtained from Senior Researcher Martin Ryhl Kærn, tel.: +45 4525 4121, email:

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Please submit your online application no later than 20 October 2017. Applications must be submitted as one pdf file containing all materials to be given consideration. To apply, please open the link "Apply online," fill in the online application form, and attach all your materials in English in one pdf file. The file must include: 

  • A letter motivating the application (cover letter)
  • Curriculum vitae
  • Grade transcripts and BSc/MSc diploma
  • Excel sheet with translation of grades to the Danish grading system (see guidelines and excel spreadsheet here)

Candidates may apply prior to ob­tai­ning their master's degree, but cannot begin before having received it.

All interested candidates irrespective of age, gender, race, disability, religion or ethnic background are encouraged to apply.

DTU Mechanical Engineering covers the fundamental engineering disciplines within Solid mechanics, Fluid mechanics, Coastal and Maritime Engineering, Energy systems and energy conversion, Materials and Surface Engineering, Manufacturing Engineering, Engineering design and Product development. The department has a scientific staff of about 135 persons, 100 PhD students and a technical/administrative support staff of about 85 persons.

DTU is a technical university providing internationally leading research, education, innovation and scientific advice. Our staff of 5,800 advance science and technology to create innovative solutions that meet the demands of society; and our 11,000 students are being educated to address the technological challenges of the future. DTU is an independent academic university collaborating globally with business, industry, government, and public agencies.