In this work, an experimental heat transfer investigation was carried out to investigate the combined influence of both amorphous carbon (a-C) layer thickness and carbon nanofibers (CNFs) on the convective heat transfer behavior. Synthesis of these carbon nano structures was achieved using catalytic chemical vapor deposition process (CCVD) on a 50 μm nickel wire at 650°C. Due to their extremely high thermal conductivity, CNFs are used to augment/modify heat transfer surface. However, the inevitable layer of a-C that occurs during the synthesis of the CNFs layer exhibit low thermal conductivity which may result in insulating the surface. In contrast, the amorphous layer helps in supporting and mechanical stabilizing of the CNFs layer attachment to the polycrystalline nickel (Ni270) substrate material. To better understand the influences of these two layer on heat transfer, the growth mechanism of the CNFs layer and the layer of carbon is investigated and growth model is proposed. The combined impact of both a-C and CNFs layer on heat transfer performance is studied on three different samples which were synthesized by varying the deposition period (16 min, 23min and 30 min). The micro wire samples covered with CNF layers were subjected to a uniform flow from a nozzle. Heat transfer measurement was achieved by a controlled heat dissipation through the micro wire to attain a constant temperature during the flow. This measurement technique is adopted from hot wire anemometry calibration method. Maximum heat transfer enhancement of 18% was achieved. This enhancement is mainly attributed to the surface roughness and surface area increase of the samples with moderate CNFs surface area coverage on the sample.
Skip Nav Destination
ASME 2013 4th International Conference on Micro/Nanoscale Heat and Mass Transfer
December 11–14, 2013
Hong Kong, China
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-5615-4
PROCEEDINGS PAPER
Convective Heat Transfer Enhancement Using Carbon Nanofibers (CNFs): Influence of Amorphous Carbon Layer on Heat Transfer Performance
T. J. Taha,
T. J. Taha
University of Twente, Enschede, Netherlands
Search for other works by this author on:
L. Lefferts,
L. Lefferts
University of Twente, Enschede, Netherlands
Search for other works by this author on:
T. H. Van der Meer
T. H. Van der Meer
University of Twente, Enschede, Netherlands
Search for other works by this author on:
T. J. Taha
University of Twente, Enschede, Netherlands
L. Lefferts
University of Twente, Enschede, Netherlands
T. H. Van der Meer
University of Twente, Enschede, Netherlands
Paper No:
MNHMT2013-22196, V001T11A009; 10 pages
Published Online:
February 26, 2014
Citation
Taha, TJ, Lefferts, L, & Van der Meer, TH. "Convective Heat Transfer Enhancement Using Carbon Nanofibers (CNFs): Influence of Amorphous Carbon Layer on Heat Transfer Performance." Proceedings of the ASME 2013 4th International Conference on Micro/Nanoscale Heat and Mass Transfer. ASME 2013 4th International Conference on Micro/Nanoscale Heat and Mass Transfer. Hong Kong, China. December 11–14, 2013. V001T11A009. ASME. https://doi.org/10.1115/MNHMT2013-22196
Download citation file:
10
Views
Related Proceedings Papers
Related Articles
Indirect Involvement of Amorphous Carbon Layer on Convective Heat Transfer Enhancement Using Carbon Nanofibers
J. Heat Transfer (September,2015)
Heat Transfer in Nanostructures for Solid-State Energy Conversion
J. Heat Transfer (April,2002)
Modeling
of Convective Cooling of a Rotating Disk by Partially Confined Liquid Jet
Impingement
J. Heat Transfer (October,2008)
Related Chapters
Completing the Picture
Air Engines: The History, Science, and Reality of the Perfect Engine
Radiation
Thermal Management of Microelectronic Equipment
Laminar Fluid Flow and Heat Transfer
Applications of Mathematical Heat Transfer and Fluid Flow Models in Engineering and Medicine