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Condensation heat transfer of CO2 on Cu based hierarchical and nanostructured surfaces

Condensation heat transfer of CO2 on Cu based hierarchical and nanostructured surfaces

Category
Academic article
Abstract
Phase-change processes such as condensation are efficient means of heat transfer. However, condensation is also an energy-intensive process and extensive research is conducted to increase the heat transfer efficiency. Increasing the effective heat transfer area in terms of surface structures on macro or microscale is one such technique of heat transfer enhancement. In this work, we have studied micro- and nanostructured surfaces for their potentials in increasing heat transfer during condensation of CO2. Three Cu-based surfaces on which CuO nanoneedles have been grown, have been investigated. We hypothesize three competing mechanisms govern the overall heat transfer on structured surfaces: 1) increased heat transfer area, 2) lower thermal conductivity of oxides, and 3) condensate flooding of the structures. Our study has shown that in some cases, the effect of these mechanisms can be neutralized. More importantly, the results show that superior heat transfer can be achieved by optimizing the surface structure. The best of the structured surfaces resulted in a heat transfer coefficient 66% higher than that of the unstructured surface.
Client
  • Research Council of Norway (RCN) / 245963
  • Research Council of Norway (RCN) / 254813
Language
English
Author(s)
Affiliation
  • Norwegian University of Science and Technology
  • SINTEF Energy Research / Gassteknologi
Year
Published in
International Journal of Heat and Mass Transfer
ISSN
0017-9310
Volume
175