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Enhanced boiling heat transfer from a novel nanodendritic micro-porous copper structure
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
2006 (English)Licentiate thesis, monograph (Other scientific)
Abstract [en]

Following licentiate thesis is a summary of the advances made within the research project - Micro- and nano structured surfaces for enhanced boiling heat transfer – which is a collaboration effort between the Divi-sion of Applied Thermodynamics and Refrigeration and the Division of Materials Chemistry at the Royal Institute of Technology (KTH).

The main objectives with this research project has been to: develop methods for producing highly efficient boiling surfaces with well defined micro- and nano-structured porous surfaces by the use of micro- and nano-manufacturing techniques. This objective has been achieved and the result is a novel micro-porous surface structure comprising dendritically ordered nano-particles of cop-per. The structure was fabricated by a high-current-density electrode-position process, in which the evolution of hydrogen bubbles serve as a dynamic masking template to the growth of the dendritic copper struc-ture. Important variables were identified that affect the production of the structure and its features, such as surface orientation during electrode-position, pressure and temperature of electrolyte, and a final heat treat-ment of the surface under reduced atmosphere, all of which have previ-ously not been reported on.

Experimental tests have been conducted in a widely used refrigerant, R134a, where the micro-porous structure was shown to enhance the boiling performance of a copper surface over 15 times compared to a regular copper surface. The boiling characteristics of the structure were found to be dependent on controllable surface characteristics. The re-markably good boiling performance of the novel micro-porous en-hancement structure has been attributed to its high porosity ( ~94%), a dendritically formed and exceptionally large surface area, and to a high density of well suited vapor escape channels (>50 per mm2).

A patent application, intended to protect the enhancement structure and its fabrication method, was submitted to the Swedish patent authorities (PRV) on March 1st, 2006.

Place, publisher, year, edition, pages
Stockholm: KTH , 2006. , 59 p.
Trita-REFR, ISSN 1102-0245 ; 06:51
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-4057OAI: diva2:10580
2006-06-15, Sal 263, KTH, Brinellvägen 68, Stockholm, 13:30
QC 20101112Available from: 2006-06-19 Created: 2006-06-19 Last updated: 2010-11-12Bibliographically approved

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