In this study, two silicon wafer substrates were coated with vertically aligned multiwalled carbon nanotubes (MWCNT) “forests” and were used for pool boiling studies. The MWCNT forests (9 and in height) were synthesized on the silicon wafer substrates using chemical vapor deposition (CVD) process. The substrates were clamped on a cylindrical copper block with embedded cartridge heaters. The heat flux was measured using sheathed K-type thermocouples, which were placed inside the cylindrical copper block. Pool boiling experiments using refrigerant PF-5060 as the working liquid were conducted to obtain the pool “boiling curve.” The experiments were conducted in nucleate and film boiling regimes to investigate the effect of MWCNT height on pool boiling performance. Reference (control) experiments were also performed with an atomically smooth bare silicon wafer (without MWCNT coating). The results show that the MWCNT forests enhanced critical heat flux (CHF) by compared to control experiments. For the film boiling regime, Type-B MWCNT ( in height) yields 57% higher heat flux at Leidenfrost point (film boiling regime) compared to control experiments. However, for the Type-A MWCNT ( in height) the film boiling heat flux values are nearly identical to the values obtained for the control experiments performed on bare silicon.
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December 2006
This article was originally published in
Journal of Heat Transfer
Technical Briefs
Pool Boiling Experiments on Multiwalled Carbon Nanotube (MWCNT) Forests
Hee Seok Ahn,
Hee Seok Ahn
Mechanical Engineering Department,
Texas A&M University
, College Station, TX 77843-3123
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Nipun Sinha,
Nipun Sinha
Mechanical Engineering Department,
Texas A&M University
, College Station, TX 77843-3123
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Mei Zhang,
Mei Zhang
NanoTech Institute and Department of Chemistry,
University of Texas at Dallas
, Richardson, TX 75083
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Debjyoti Banerjee,
Debjyoti Banerjee
Mechanical Engineering Department,
Texas A&M University
, College Station, TX 77843-3123
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Shaoli Fang,
Shaoli Fang
NanoTech Institute and Department of Chemistry,
University of Texas at Dallas
, Richardson, TX 75083
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Ray H. Baughman
Ray H. Baughman
NanoTech Institute and Department of Chemistry,
University of Texas at Dallas
, Richardson, TX 75083
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Hee Seok Ahn
Mechanical Engineering Department,
Texas A&M University
, College Station, TX 77843-3123
Nipun Sinha
Mechanical Engineering Department,
Texas A&M University
, College Station, TX 77843-3123
Mei Zhang
NanoTech Institute and Department of Chemistry,
University of Texas at Dallas
, Richardson, TX 75083
Debjyoti Banerjee
Mechanical Engineering Department,
Texas A&M University
, College Station, TX 77843-3123
Shaoli Fang
NanoTech Institute and Department of Chemistry,
University of Texas at Dallas
, Richardson, TX 75083
Ray H. Baughman
NanoTech Institute and Department of Chemistry,
University of Texas at Dallas
, Richardson, TX 75083J. Heat Transfer. Dec 2006, 128(12): 1335-1342 (8 pages)
Published Online: May 29, 2006
Article history
Received:
November 8, 2005
Revised:
May 29, 2006
Citation
Ahn, H. S., Sinha, N., Zhang, M., Banerjee, D., Fang, S., and Baughman, R. H. (May 29, 2006). "Pool Boiling Experiments on Multiwalled Carbon Nanotube (MWCNT) Forests." ASME. J. Heat Transfer. December 2006; 128(12): 1335–1342. https://doi.org/10.1115/1.2349511
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