19/06/2018
Science 4 Refugees

PhD Position on heat transfer enhancement by nanofluids spray cooling


  • ORGANISATION/COMPANY
    KU Leuven
  • RESEARCH FIELD
    EngineeringThermal engineering
  • RESEARCHER PROFILE
    First Stage Researcher (R1)
  • APPLICATION DEADLINE
    31/07/2018 23:59 - Europe/Brussels
  • LOCATION
    Belgium › Leuven
  • TYPE OF CONTRACT
    Permanent
  • JOB STATUS
    Full-time
  • HOURS PER WEEK
    38
  • REFERENCE NUMBER
    BAP-2018-423

The design of efficient cooling-heating devices is a crucial task in several applications such as microelectronics, biotechnologies, automotive and aerospace engineering. Unfortunately, the use of strong power density is today coupled to a lack of efficient heat dissipation methods leading to a truly technological bottleneck. Therefore, the understanding of the transport phenomena involved in micro heat transfer and their enhancement is definitely needed to allow the further miniaturization technological step. Spray cooling techniques represent one of the most promising heat dissipation methods today. In spray cooling, the hot surface is cooled by means of fine droplets that impact on the surface and may generate a liquid film. The factors influencing the heat transfer performance of spray cooling mainly include spray characteristics heating surface characteristics and the liquid film thermal condition. These factors are, in principle, coupled to each other. The use of nanofluids in spray cooling is also an emerging area of research however the mechanisms leading to the nanofluids heat enhancement, especially in the two-phase regime, are not clear and contradictory results are found in literature, leading to the conclusion that the heat transfer coefficient may increase/or decrease depending on the base fluid, the target surface temperatures, and the droplet impact characteristics.

The research is divided in two phases. Initially the research focusses on the study of the impact of single nanofluids droplets on either a dry or a wetted heated transparent surface. The impingement dynamics will be analyzed by means of high speed imaging and image analysis while the thermal behavior of the droplet during the impact and the heat transfer process will be studied by means of a combined laser induced fluorescence (LIF) technique and infrared thermography. The possible nanoparticle deposition on the substrate due to the droplets impact will be evaluated by using an electron microscopy system.

In the second phase, a more complex configuration, in which a full cone micro-spray impinges on a heated surface will be developed. The experimental conditions will be adjusted in order to obtain a thin liquid film flowing on the surface. The two-dimensional liquid film temperature map and the film thickness will be measured by means of non-intrusive measurement techniques to correlate the temperature inside the film with its thickness and the heat transfer process, leading to a more accurate evaluation of the local heat transfer coefficient.

Benefits

The PhD position lasts for the duration of four years, and is carried out at the University of Leuven. During this time, the candidate also takes up a limited amount (approx. 10% of the time) of teaching activities.

The remuneration is generous and is in line with the standard KU Leuven rates.

Ideal start time is October 1st 2018, but earlier and later starting dates can be negotiated.

Eligibility criteria

Candidates have a master degree in one of the following or related fields: fluid mechanics, aerospace, energy, optics.

They should have a good background or interest in experimental fluid mechanics, heat transfer and measurement techniques.

Proficiency in English is a requirement.

Selection process

To apply, please use the online application tool to submit your application and include: (i) an academic CV and a PDF of your diplomas and transcript of course work and grades, (ii) a statement of research interests and career goals, indicating why you are interested in this position, (iii) a sample of technical writing, e.g. a paper with you as main author, or your bachelor or master thesis, (iv) two recommendation letters, (v) some proof of proficiency in English (e.g. language test results from TOEFL, IELTS, CAE, or CPE).

For more information please contact Prof. dr. Maria Rosaria Vetrano, tel.: +32 16 37 37 10, mail: rosaria.vetrano@kuleuven.be or Prof. dr. Erin Koos, tel.: +32 16 37 63 47, mail: erin.koos@kuleuven.be.
You can apply for this job no later than 31/07/2018 via the online application tool

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Work location(s)
1 position(s) available at
KU Leuven
Belgium
Leuven
3000

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EURAXESS offer ID: 317069