Influence of the surface roughness on the cooling intensity during spray cooling

Tereza Brožová, Martin Chabičovský, Jaroslav Horský

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

The surface roughness plays an important role during spray cooling of hot surfaces in a presence of the boiling. Bubbles are formed in small cavities on the surface during nucleate pool boiling. Enhanced surface roughness causes that more bubbles are formed and it causes increased cooling intensity. The surface with increased roughness has also bigger surface area, which allows higher heat flow between surface and surrounding water. The influence of the surface roughness during pool boiling was investigated by many authors. The increased surface roughness causes shift of the Leidenfrost temperature to higher temperatures and increases critical heat flux during pool boiling. The influence of the surface roughness during spray cooling of hot surfaces was not still sufficiently investigated and it is not known if the effect of the surface roughness is similar like in a case of the pool boiling. Experiments for describing the effect of the surface roughness on the cooling intensity were conducted with water nozzle with flat jet. Test samples were heated in a protective atmosphere at a temperature 730 °C and then cooled to the room temperature. Test samples were made of the austenitic stainless steel to minimize the forming of the scales on the surface. Results showing influence of the surface roughness on the critical heat flux and on the Leidenfrost temperature are presented.

Original languageEnglish
Title of host publicationMETAL 2016 - 25th Anniversary International Conference on Metallurgy and Materials, Conference Proceedings
PublisherTANGER Ltd.
Pages41-46
Number of pages6
ISBN (Electronic)9788087294673
Publication statusPublished - 1 Jan 2016
Externally publishedYes
Event25th International Conference on Metallurgy and Materials, METAL 2016 - Brno, Czech Republic
Duration: 25 May 201627 May 2016

Publication series

NameMETAL 2016 - 25th Anniversary International Conference on Metallurgy and Materials, Conference Proceedings

Conference

Conference25th International Conference on Metallurgy and Materials, METAL 2016
CountryCzech Republic
CityBrno
Period25.5.1627.5.16

Keywords

  • Critical heat flux
  • Heat transfer coefficient
  • Leidenfrost temperature
  • Spray cooling
  • Surface roughness

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Mechanics of Materials

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  • Cite this

    Brožová, T., Chabičovský, M., & Horský, J. (2016). Influence of the surface roughness on the cooling intensity during spray cooling. In METAL 2016 - 25th Anniversary International Conference on Metallurgy and Materials, Conference Proceedings (pp. 41-46). (METAL 2016 - 25th Anniversary International Conference on Metallurgy and Materials, Conference Proceedings). TANGER Ltd..