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Enhancement of nucleate boiling heat transfer by micro-structured chromium nitride surfaces

Fischer, S. ; Slomski, E. M. ; Stephan, P. ; Oechsner, M. (2024)
Enhancement of nucleate boiling heat transfer by micro-structured chromium nitride surfaces.
In: Journal of Physics: Conference Series, 2012, 395 (1)
doi: 10.26083/tuprints-00020792
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Enhancement of nucleate boiling heat transfer by micro-structured chromium nitride surfaces
Language: English
Date: 6 February 2024
Place of Publication: Darmstadt
Year of primary publication: 2012
Place of primary publication: Bristol
Publisher: IOP Publishing
Journal or Publication Title: Journal of Physics: Conference Series
Volume of the journal: 395
Issue Number: 1
Collation: 8 Seiten
DOI: 10.26083/tuprints-00020792
Corresponding Links:
Origin: Secondary publication DeepGreen
Abstract:

In the present work, the influence of micro-structured chromium nitride (CrN) surfaces on boiling heat transfer during nucleate boiling of FC-72 at saturation temperature was investigated. The CrN thin coatings of 4.5 μm thickness in average were deposited by Physical Vapor Deposition (PVD) as a combination of High Power Impulse Magnetron Sputtering (HiPIMS) and Direct Current Magnetron Sputtering (DCMS) on polished copper surfaces. Due to variation of the applied bias voltage to the substrates different sizes and orientations of the CrN crystals were realized. The typical dimensions of the hereby generated surface structures are in the order of a few hundred nm to a few μm. It was found that all employed micro-structured CrN surfaces yield an increase of the critical heat flux (CHF) compared to an uncoated reference surface. The maximum ratio of the CHF of a CrN structured surface to the CHF of the uncoated copper surface reached within this study was CHFmax/CHFref = 2.5.

Identification Number: Artikel-ID: 012128
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-207929
Additional Information:

6th European Thermal Sciences Conference (Eurotherm 2012) 4–7 September 2012, Poitiers, France

Classification DDC: 600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
600 Technology, medicine, applied sciences > 660 Chemical engineering
Divisions: 16 Department of Mechanical Engineering > Center for Engineering Materials, State Materials Testing Institute Darmstadt (MPA) Chair and Institute for Materials Technology (IfW)
16 Department of Mechanical Engineering > Institute for Technical Thermodynamics (TTD)
Exzellenzinitiative > Clusters of Excellence > Center of Smart Interfaces (CSI)
Date Deposited: 06 Feb 2024 10:32
Last Modified: 30 Apr 2024 11:56
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/20792
PPN: 517437260
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