Transport Phenomena - Delft University of Technology

Kevin van As

Kevin van As (photo)

Numerical Study of Heat Transfer Enhancement due to Boiling in Rayleigh-Bénard Convection

Contact details

  • Ir. Kevin van As
  • Delft University of Technology
  • Faculty of Applied Sciences (TNW)
  • Department of Chemical Engineering
  • Transport Phenomena Group
  • Building 58, Room F2.150
  • van der Maasweg 9, Delft, The Netherlands

Research interests

  • Physics (general)
  • Computational Fluid Dynamics
  • OpenFOAM

Social Media

Public contributions

Research Description

Rayleigh-Bénard Convection (RBC) is a paradigmatic geometry in Fluid Dynamics to study natural convection. It consists of an initially quiescent liquid between two horizontal plates that are kept at two different temperatures. The lower plate is at a higher temperature than the upper plate which induces natural convection ("hot air rises"). In my case, the lower plate will be above the saturation temperature of the liquid, which causes the liquid to boil.

RBC is a simplified version of what is found everywhere in nature and industry, e.g.: the Earth and the atmosphere; convection inside the Earth mantle; circulation in the ocean; all kinds of production processes, e.g. chemicals; as well as heat exchanges and cooling devices, e.g. in computer chips. RBC is probably the best-studied flow problem in fluid dynamics, yet there is still so much more to learn; especially the combination of RBC with boiling has only recently been studied.

The aim of the project is to provide a fundamental understanding of the influence of boiling on heat transfer in Rayleigh-Bénard Convection. This matter has only recently been studied by two independent groups. Lakkaraju et al. (2011-2014) have treated bubbles as point particles and neglected nucleate boiling. They have found a significant heat transfer enhancement due to the presence of the bubbles, in addition to a reduced intermittency. Biferale et al. (2012) have performed Lattice-Boltzmann simulations and found a significantly lower heat transfer enhancement and the opposite effect on intermittency: an enhancement. Amongst other research goals, we wish to address this conflict in literature.

Student Projects

I currently have three student projects available related to my research:

Nucleating Bubble in an External Flow Bubbling Natural Convection Using Dynamic Mesh Refinement for Simulating Bubbles

If you have an alternative idea of a project you'd like to do, feel free to run it by me! Projects supervised by other people of our group are listed over here.


Teaching Assistant

  • Physics:
    • MSc Applied Physics:
      • (AP3171D) Advanced Physical Transport Phenomena (APTP) [2016-2017 Q3]
      • (AP3171D) Advanced Physical Transport Phenomena (APTP) [2015-2016 Q3]
    • BSc Technische Natuurkunde (Applied Physics):
      • (TN1612TU) Mechanica en Relativiteitstheorie (Mechanics and Relativity) [2016-2017 Q3]
      • (TN2321) Klassieke Mechanica (Classical Mechanics) [2016-2017 Q2]
      • (TN2054) Elektromagnetisme (Electromagnetism) [2016-2017 Q1]
      • (TN1612TU) Mechanica en Relativiteitstheorie (Mechanics and Relativity) [2015-2016 Q3]
      • (TN2953-P) Research Practicum (Lab-on-a-Chip) [2015-2016]
      • (TN2054) Elektromagnetisme (Electromagnetism) [2015-2016 Q1]
      • (WI1410TN) Voortgezette Analyse (Advanced Calculus) [2014-2015 Q4]
      • (TN1612TU) Mechanica en Relativiteitstheorie (Mechanics and Relativity) [2014-2015 Q3]
  • Other:
    • MSc Chemical Engineering:
      • (CH3053) Applied Transport Phenomena (ATP) [2016-2017 Q2, week 4 and 5 only]
      • (CH3053) Applied Transport Phenomena (ATP) [2015-2016 Q2]
    • Minor Moderne Natuurkunde (Modern Physics):
      • (TN2893) Introduction to Methods in Physics and Mathematics [2015-2016 Q1]
    • BSc Informatica (Computer Science):
      • (TI2735-A) Computational Intelligence [2013-2014 Q1]

Personal education

For details, consult my LinkedIn profile:

  • MSc Applied Physics (cum laude: GPA = 9.3/10), TU Delft (2015)
    MSc thesis on "Interferometric Scattering of Light by an Ensemble of Flowing Spherical Particles: A Numerical Study", grade 9.5/10.
  • BSc Technische Natuurkunde (Applied Physics) (cum laude: GPA = 8.9/10), TU Delft (2013)
    Minor in "Software Development"
Last modified: February 16 2017. © Delft University of Technology - TP group 2012