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Efficacité du refroidissement de gouttelettes à faibles nombres de Wepler : effet de la température.

Cooling effectiveness of droplets at low Weber numbers: effect of temperature.

Auteurs : STROTOS G., NIKOLOPOULOS N., NIKAS K. S., et al.

Type d'article : Article

Résumé

The impact of water droplets onto a heated non-isothermal surface is studied numerically using VOF methodology and assuming a 2D-axisymmetric computational domain. An adaptive grid-refinement technique in both fluid and solid phases is used to solve the conjugate problem of fluid flow and heat transfer. Parametric studies examine the effect of initial solid-surface temperature and initial droplet temperature, while all other parameters which affect the temporal evolution of the phenomenon are kept constant; the wall temperatures examined are low enough to prevent the onset of nucleate boiling. It is proven that the variables describing the temporal evolution of the phenomenon evolve in the same way as when they are non-dimensionalised with expressions arising from the transient heat-conduction theory. Additionally, a formula for the maximum droplet spreading which accounts for droplet heating during spreading is proposed, as are semi-analytical expressions which describe the thermal behaviour of the droplet.

Détails

  • Titre original : Cooling effectiveness of droplets at low Weber numbers: effect of temperature.
  • Identifiant de la fiche : 30008447
  • Langues : Anglais
  • Source : International Journal of thermal Sciences - vol. 72
  • Date d'édition : 10/2013
  • DOI : http://dx.doi.org/10.1016/j.ijthermalsci.2013.05.008

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