The contact angle of nanofluids as thermophysical property

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift


Droplet volume and temperature affect contact angle significantly. Phase change heat transfer processes of nanofluids – suspensions containing nanometre-sized particles – can only be modelled properly by understanding these effects. The approach proposed here considers the limiting contact angle of a droplet asymptotically approaching zero-volume as a thermophysical property to characterise nanofluids positioned on a certain substrate under a certain atmosphere. Graphene oxide, alumina, and gold nanoparticles are suspended in deionised water. Within the framework of a round robin test carried out by nine independent European institutes the contact angle of these suspensions on a stainless steel solid substrate is measured with high accuracy. No dependence of nanofluids contact angle of sessile droplets on the measurement device is found. However, the measurements reveal clear differences of the contact angle of nanofluids compared to the pure base fluid. Physically founded correlations of the contact angle in dependency of droplet temperature and volume are obtained from the data. Extrapolating these functions to zero droplet volume delivers the searched limiting contact angle depending only on the temperature. It is for the first time, that this specific parameter, is understood as a characteristic material property of nanofluid droplets placed on a certain substrate under a certain atmosphere. Together with the surface tension it provides the foundation of proper modelling phase change heat transfer processes of nanofluids.


  • M. Hernaiz
  • V. Alonso
  • P. Estellé
  • L. Doretti
  • S. Mancin
  • N. Çobanoğlu
  • Z. H. Karadeniz
  • N. Garmendia
  • M. Lasheras-Zubiate
  • L. Hernández López
  • R. Mondragón
  • R. Martínez-Cuenca
  • S. Barison
  • A. Kujawska
  • A. Turgut
  • A. Amigo
  • G. Huminic
  • A. Huminic
  • M. R. Kalus
  • K. G. Schroth
  • M. H. Buschmann
Enheter & grupper
Externa organisationer
  • University of Padova
  • Jaume I University
  • Wrocław University of Science and Technology
  • Dokuz Eylül University
  • Transylvania University Brasov
  • Institut für Luft- und Kältetechnik Dresden
  • IK4-Tekniker
  • University of Rennes I
  • Izmir Katip Celebi University
  • Naitec
  • CNR Istituto di Chimica della Materia Condensata e di Tecnologie per l'Energia (ICMATE)
  • University of Santiago de Compostela
  • Particular GmbH

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Energiteknik


Sidor (från-till)393-406
Antal sidor14
TidskriftJournal of Colloid and Interface Science
StatusPublished - 2019
Peer review utfördJa