Carmeliet

Contact

Dr. Thijs Defraeye
Scientist at Empa Swiss Federal Laboratories Research fellow & Lecturer at ETH Zürich
Multiscale Studies in Building Physics Chair of Building Physics
Überlandstrasse 129 Stefano-Franscini-Platz 5
8600 Dübendorf 8093 Zürich Hönggerberg
Switzerland Switzerland
tel +41 (0)58 765 47 90
thijs.defraeye@empa.ch defraeye@arch.ethz.ch

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Profile

Education & Employment

2014-present Scientist at Empa - Research fellow & Lecturer at ETH Zürich
2011-2014 Postdoctoral fellow (3-year grant of FWO Flanders) at MeBioS group (KU Leuven)
2006-2011 PhD at the Laboratory of Building Physics (KU Leuven)
2006 Master in Civil Engineering (KU Leuven)

Academic publishing

  • 58 articles in peer-reviewed journals
  • Reviewer for 23 journals
  • International Editorial Advisory Board
    • Drying Technology
    • Postharvest Biology and Technology

Lectures at ETH Zürich

  • Bachelor course Building Physics II: Moisture
  • Master course Moisture & Durability

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Projects & Collaboration

Running projects

Current collaboration

  • University of Stellenbosch (South Africa)
  • KU Leuven (Belgium)
  • Paul Scherrer Institute (Switzerland)
  • Member of the ETH World Food System Center

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Research

Current research focus

  • Multiphysics modelling and non-destructive imaging of convective drying processes of manufactured and biological materials
  • Optimisation of cooling processes, packaging and energy efficiency in the food cold chain

Research interests

  • Drying processes
  • Coupled hygrothermal-mechanical-chemical processes
  • Food cold chain
  • Food package design
  • Computational engineering
  • Multiscale modelling
  • Outdoor pedestrian wind comfort
  • Plant-atmosphere exchange processes
  • Sports aerodynamics
  • Urban physics & building physics
  • Wind engineering
  • Wind-tunnel design
  • Indoor ventilation

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Expertise

  • Computational fluid dynamics (RANS, LES)
  • Coupled heat-air-moisture transport modelling in porous materials
  • Multiphysics modelling
  • Non-destructive imaging (neutron computed tomography, magnetic resonance imaging)
  • Wind-tunnel experiments (particle image velocimetry, hot wire anemometry)
  • Design of complementary experimental and numerical modelling programs.

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Publications

2017 2016 2015 2014 2013 2012 2011 2010 2009


2017

. Berry T., Fadiji T., Defraeye T., Opara U.L. (2017), The role of horticultural carton vent hole design on cooling efficiency and compression strength: A multi-parameter approach, Postharvest Biology and Technology, Accepted.
. Radu A., Defraeye T., Ruch P., Carmeliet J., Derome D. (2017), Insights from modeling dynamics of water sorption in spherical particles for adsorption heat pumps, International Journal of Heat and Mass Transfer, Accepted.
. Defraeye T., Radu A., Derome D. (2017), Recent advances in drying at interfaces of biomaterials, Drying Technology, Accepted. DOI
. Defraeye T., Verboven P. (2017), Moisture barriers to control drying of fresh-cut fruit: quantifying their impact by modeling, Food and Bioproducts Processing 101, 205-213. DOI (pdf preprint)
. Defraeye T. (2017), When to stop drying fruit: Insights from hygrothermal modelling, Applied Thermal Engineering 110, 1128–1136. DOI (pdf preprint)
. Defraeye T., Verboven P. (2017), Convective drying of fruit: Role and impact of moisture transport properties in modelling, Journal of Food Engineering 193, 95-107. DOI (pdf preprint)

2016

59. Defraeye T. (2016), Towards more efficient intermittent drying of fruit: insights from combined hygrothermal-quality modelling, Innovative Food Science and Emerging Technologies 38, 262-271. DOI (pdf preprint)
58. Defraeye T., Nicolai B., Mannes D., Aregawi W., Verboven P., Derome D. (2016), Probing inside fruit slices during convective drying by quantitative neutron imaging, Journal of Food Engineering 178, 198-202. DOI (pdf preprint)
57. Defraeye T., Nicolai B., Kirkman W., Moore S., van Niekerk S., Verboven P., Cronjé P. (2016), Integral performance evaluation of the fresh-produce cold chain: A case study for ambient loading of citrus in refrigerated containers, Postharvest Biology and Technology 112, 1-13. DOI (pdf preprint)
56. Kuffi K., Defraeye T., Nicolai B., De Smet S., Geeraerd A., Verboven P. (2016), CFD modelling of industrial cooling of large beef carcasses, International Journal of Refrigeration 69, 324-339. DOI
55. Berry T.M., Defraeye T., Nicolai B., Opara U.L (2016), Multi-parameter analysis of cooling efficiency of ventilated fruit cartons using CFD: Impact of vent hole design and internal packaging, Food and Bioprocess Technology 9, 1481-1493. DOI

2015

54. Defraeye T., Cronjé P., Verboven P., Opara U.L., Nicolai B. (2015), Exploring ambient loading of citrus fruit into reefer containers for cooling during marine transport using computational fluid dynamics, Postharvest Biology and Technology 108, 91-101. DOI (pdf preprint)
53. Defraeye T., Cronjé P., Berry T., Opara U.L., East A., Hertog M., Verboven P., Nicolai B. (2015), Towards integrated performance evaluation of future packaging for fresh produce in the cold chain, Trends in Food Science & Technology 44, 201-225. DOI (pdf preprint)
52. Defraeye T., Verboven P., Opara U.L., Nicolai B., Cronjé P. (2015), Feasibility of ambient loading of citrus fruit into refrigerated containers for cooling during marine transport, Biosystems Engineering 134, 20-30. DOI (pdf preprint)
51. Martin M., Defraeye T., Derome D., Carmeliet J. (2015), A film flow model for analysing gravity-driven, thin wavy fluid films, International Journal of Multiphase Flow 73, 207-216. DOI
50. Rogge S., Defraeye T., Herremans E., Verboven P., Nicolai B. (2015), A 3D contour based geometrical model generator for complex-shaped horticultural products, Journal of Food Engineering 157, 24-32. DOI

2014

49. Defraeye T. (2014), Advanced computational modelling for drying processes - a review, Applied Energy 131, 323-344. DOI (pdf preprint)
48. Defraeye T., Lambrecht R., Delele M.A., Ambaw A., Opara U.L., Cronjé P., Verboven P., Nicolai B. (2014), Forced-convective cooling of citrus fruit: cooling conditions and energy consumption in relation to package design, Journal of Food Engineering 121, 118-127. DOI (pdf preprint)
47. Defraeye T., Derome D., Verboven P., Carmeliet J., Nicolai B. (2014), Cross-scale modelling of transpiration from stomata via the leaf boundary layer, Annals of Botany 114 (4), 711-723. DOI (pdf preprint)
46. Defraeye T., Derome D., Aregawi W., Cantré D., Hartmann S., Lehmann E., Carmeliet J., Voisard F., Verboven P., Nicolai B. (2014), Quantitative neutron imaging of water distribution, venation network and sap flow in leaves, Planta 240 (2), 423-436. DOI (pdf preprint)
45. Defraeye T., Blocken B., Koninckx E., Hespel P., Verboven P., Nicolai B., Carmeliet J. (2014), Cyclist drag in team pursuit: influence of cyclist sequence, stature and arm spacing, Journal of Biomechanical Engineering 136 (1), 011005. DOI (pdf preprint)
44. Nicolai B., Defraeye T., De Ketelaere B., Herremans E., Hertog M., Saeys W., Toricelli A., Vandendriessche T., Verboven P. (2014), Nondestructive measurement of fruit and vegetable quality, Annual Review of Food Science and Technology 5, 285-312. DOI
43. Aregawi W., Defraeye T., Saneinejad S., Vontobel P., Lehmann E., Carmeliet J., Verboven P., Derome D., Nicolai B. (2014), Understanding forced convective drying of apple tissue: combining neutron radiography and numerical modelling, Innovative Food Science & Emerging Technologies 24, 97-105. DOI
42. Abera M.K., Verboven P., Defraeye T., Fanta S.W., Hertog M., Carmeliet J., Nicolai B. (2014), A plant cell division algorithm based on cell biomechanics and ellipse fitting, Annals of Botany 114 (4), 605-617. DOI
41. Abera M.K., Verboven P., Herremans E., Defraeye T., Fanta S.W., Ho Q.T., Carmeliet J., Nicolai B. (2014), 3D virtual pome fruit tissue generation based on cell growth modeling, Food and Bioprocess Technology 7 (2), 542-555. DOI
40. Ambaw A., Verboven P., Delele M.A., Defraeye T., Tijskens E., Schenk A., Verlinden B., Opara L.U., Nicolai B. (2014), CFD-based analysis of 1-MCP distribution in commercial cool store rooms: porous medium model application, Food and Bioprocess Technology 7 (7), 1903-1916. DOI
39. Rogge S., Beyene S., Herremans E., Hertog M., Defraeye T., Verboven P., Nicolai B. (2014), A geometrical model generator for quasi-axisymmetric biological products, Food and Bioprocess Technology 7 (6), 1783-1792. DOI
38. Herremans E., Verboven P., Defraeye T., Rogge S., Ho Q.T., Hertog M., Verlinden B., Bongaers E., Wevers M., Nicolai B. (2014), X-ray CT for quantitative food microstructure engineering: The apple case, Nuclear Instruments & Methods in Physics Research B: Beam Interactions with Materials and Atoms 324, 88-94. DOI
37. Herremans E., Melado-Herreros A., Defraeye T., Verlinden B., Hertog M., Verboven P., Val J., Fernández-Valle M.E., Bongaers E., Estrade P., Wevers M., Barreiro P., Nicolai B. (2014), Comparison of X-ray CT and MRI of watercore disorder of different apple cultivars, Postharvest Biology and Technology 87, 42-50. DOI
36. Ho Q.T., Verboven P., Fanta S.W., Abera M.K., Retta M.A., Herremans E., Defraeye T., Nicolai B. (2014), A multiphase pore scale network model of gas exchange in apple fruit, Food and Bioprocess Technology 7 (2), 482-495. DOI
35. Van Dyck T., Verboven P., Herremans E., Defraeye T., Van Campenhout L., Wevers M., Claes J., Nicolai B. (2014), Characterisation of structural patterns in bread as evaluated by X-ray computer tomography, Journal of Food Engineering 123, 67-77. DOI

2013

34. Defraeye T., Aregawi W., Saneinejad S., Vontobel P., Lehmann E., Carmeliet J., Verboven P., Derome D., Nicolai B. (2013), Novel application of neutron radiography to forced convective drying of fruit tissue, Food and Bioprocess Technology 6 (12), 3353-3367. DOI (pdf preprint)
33. Defraeye T., Verboven P., Derome D., Carmeliet J., Nicolai B. (2013), Stomatal transpiration and droplet evaporation on leaf surfaces by a microscale modelling approach, International Journal of Heat and Mass Transfer 65, 180-191. DOI (pdf preprint)
32. Defraeye T., Verboven P., Ho Q.T., Nicolai B. (2013), Convective heat and mass exchange predictions at leaf surfaces: Applications, methods and perspectives, Computers and Electronics in Agriculture 96, 180-201. DOI (pdf preprint)
31. Defraeye T., Lambrecht R., Ambaw A., Delele M.A., Opara U.L., Cronjé P., Verboven P., Nicolai B. (2013), Forced-convective cooling of citrus fruit: package design, Journal of Food Engineering 118 (1), 8-18. DOI (pdf preprint)
30. Defraeye T., Lehmann V., Gross D., Holat C., Herremans E., Verboven P., Verlinden B., Nicolai B. (2013), Application of MRI for tissue characterisation of ‘Braeburn’ apple, Postharvest Biology and Technology 75, 96-105. DOI (pdf preprint)
29. Defraeye T., Verboven P., Nicolai B. (2013), CFD modelling of flow and scalar exchange of spherical food products: turbulence and boundary-layer modelling, Journal of Food Engineering 114 (4), 495-504. DOI (pdf preprint)
28. Defraeye T., Blocken B., Carmeliet J. (2013), Influence of uncertainty in heat-moisture transport properties on convective drying of porous materials by numerical modelling, Chemical Engineering Research and Design 91 (1), 36-42. DOI (pdf preprint)
27. Aregawi W., Defraeye T., Saneinejad S., Vontobel P., Lehmann E., Carmeliet J., Derome D., Verboven P., Nicolai B. (2013), Dehydration of apple tissue: intercomparison of neutron tomography with numerical modelling, International Journal of Heat and Mass Transfer 67, 173-182. DOI
26. Aregawi W., Defraeye T., Verboven P., Herremans E., De Roeck G., Nicolai B. (2013), Modelling of coupled water transport and large deformation during dehydration of apple tissue, Food and Bioprocess Technology 6 (8), 1963-1978. DOI
25. Ambaw A., Verboven P., Defraeye T., Schenk A., Opara U., Nicolai B. (2013), Effect of box materials on the distribution of 1-MCP gas during cold storage: a CFD study, Journal of Food Engineering 119 (1), 150-158. DOI
24. Ambaw A., Verboven P., Delele M.A., Defraeye T., Tijskens E., Shenk A., Nicolai B. (2013), CFD modelling of the 3D spatial and temporal distribution of 1-methylcyclopropene in a fruit storage container, Food and Bioprocess Technology 6 (9), 2235-2250. DOI
23. Ambaw A., Verboven P., Defraeye T., Tijskens E., Schenk A., Opara U.L., Nicolai B. (2013), Porous medium modeling and parameter sensitivity analysis of 1-MCP distribution in boxes with apple fruit, Journal of Food Engineering 119 (1), 13-21. DOI
22. Ambaw A., Delele M., Defraeye T., Ho Q.T., Opara U.L., Nicolai B., Verboven P. (2013), The use of CFD to characterize and design post-harvest storage facilities: Past, present and future, Computers and Electronics in Agriculture 93, 184-194. DOI
21. Blocken B., Defraeye T., Koninckx E., Carmeliet J., Hespel P. (2013), CFD simulations of the aerodynamic drag of two drafting cyclists, Computers & Fluids 71, 435-445. DOI
20. Ho Q.T., Carmeliet J., Datta A.K., Defraeye T., Delele M.A., Herremans E., Opara L., Ramon H., Tijskens E., van der Sman R., Van Liedekerke P., Verboven P., Nicolai B. (2013), Multiscale modeling in food engineering, Journal of Food Engineering 114 (3), 279-291. DOI

2012

19. Defraeye T., Herremans E., Verboven P., Carmeliet J., Nicolai B. (2012), Convective heat and mass exchange at surfaces of horticultural products: a microscale CFD modelling approach, Agricultural and Forest Meteorology 162-163, 71-84. DOI (pdf preprint)
18. Defraeye T., Blocken B., Derome D., Nicolai B., Carmeliet J. (2012), Convective heat and mass transfer modelling at air-porous material interfaces: overview of existing methods and relevance, Chemical Engineering Science 74, 49-58. DOI (pdf preprint)
17. Defraeye T., Blocken B., Carmeliet J. (2012), CFD simulation of heat transfer at surfaces of bluff bodies in turbulent boundary layers: evaluation of a forced-convective temperature wall function for mixed convection, Journal of Wind Engineering and Industrial Aerodynamics 104-106, 439-446. DOI (pdf preprint)
16. Defraeye T., Houvenaghel G., Carmeliet J., Derome D. (2012), Numerical analysis of convective drying of gypsum boards, International Journal of Heat and Mass Transfer 55 (9-10), 2590-2600. DOI (pdf preprint)
15. Defraeye T., Blocken B., Carmeliet J. (2012), Analysis of convective heat and mass transfer coefficients for convective drying of a porous flat plate by conjugate modelling, International Journal of Heat and Mass Transfer 55 (1-3), 112-124. DOI (pdf preprint)
14. Moonen P., Defraeye T., Dorer V., Blocken B., Carmeliet J. (2012), Urban Physics: effect of the micro-climate on comfort, health and energy demand, Frontiers of Architectural Research 1, 197-228. DOI
13. van Hooff T., Blocken B., Defraeye T., Carmeliet J., van Heijst G.J.F. (2012), PIV measurements of a plane wall jet in a confined space at transitional slot Reynolds numbers, Experiments in Fluids 53 (2), 499-517. DOI
12. van Hooff T., Blocken B., Defraeye T., Carmeliet J., van Heijst G.J.F. (2012), PIV measurements and analysis of transitional flow in a reduced-scale model: Ventilation by a free plane jet with Coanda effect, Building and Environment 56, 301-313. DOI
11. Saneinejad S., Moonen P., Defraeye T., Derome D., Carmeliet J. (2012), Coupled CFD, radiation and porous media transport model for evaluating evaporative cooling in an urban environment, Journal of Wind Engineering and Industrial Aerodynamics 104-106, 455-463. DOI
10. Allegrini J., Dorer V., Defraeye T., Carmeliet J. (2012), An adaptive temperature wall function for mixed convective flows at exterior surfaces of buildings in street canyons, Building and Environment 49, 55-66. DOI

2011

9. Defraeye T., Blocken B., Carmeliet J. (2011), An adjusted temperature wall function for turbulent forced convective heat transfer for bluff bodies in the atmospheric boundary layer, Building and Environment 46 (11), 2130-2141. DOI (pdf preprint)
8. Defraeye T., Blocken B., Koninckx E., Hespel P., Carmeliet J. (2011), Computational fluid dynamics analysis of drag and convective heat transfer of individual body segments for different cyclist positions, Journal of Biomechanics 44 (9), 1695-1701. DOI (pdf preprint)
7. Defraeye T., Blocken B., Carmeliet J. (2011), Convective heat transfer coefficients for exterior building surfaces: Existing correlations and CFD modelling, Energy Conversion & Management 52 (1), 512-522. DOI (pdf preprint)
6. Saneinejad S., Moonen P., Defraeye T., Carmeliet J. (2011), Analysis of convective heat and mass transfer at the vertical walls of a street canyon, Journal of Wind Engineering and Industrial Aerodynamics 99 (4), 424-433. DOI

2010

5. Defraeye T., Carmeliet J. (2010), A methodology to assess the influence of local wind conditions and building orientation on the convective heat transfer at building surfaces, Environmental Modelling & Software 25 (12), 1813-1824. DOI (pdf preprint)
4. Defraeye T., Blocken B., Koninckx E., Hespel P., Carmeliet J. (2010), Computational fluid dynamics analysis of cyclist aerodynamics: Performance of different turbulence-modelling and boundary-layer modelling approaches, Journal of Biomechanics 43 (12), 2281-2287. DOI (pdf preprint)
3. Defraeye T., Blocken B., Koninckx E., Hespel P., Carmeliet J. (2010), Aerodynamic study of different cyclist positions: CFD analysis and full-scale wind-tunnel tests, Journal of Biomechanics 43 (7), 1262-1268. DOI (pdf preprint)
2. Defraeye T., Blocken B., Carmeliet J. (2010), CFD analysis of convective heat transfer at the surfaces of a cube immersed in a turbulent boundary layer, International Journal of Heat and Mass Transfer 53 (1-3), 297-308. DOI (pdf preprint)

2009

1. Blocken B., Defraeye T., Derome D., Carmeliet J. (2009), High-resolution CFD simulations for forced convective heat transfer coefficients at the facade of a low-rise building, Building and Environment 44 (12), 2396-2412. DOI


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