We are developing innovative heat pipes based on Nano-Structured Titania (NST) with a potential for high heat carrying capacity and high thermal conductivity. These heat pipes have a flat geometry as opposed to a cylindrical geometry found in conventional heat pipes. The flatness will enable a good contact with microprocessor chips and thus reduce the thermal contact resistance. We refer to it as a Thermal Ground Plane (TGP) because of its flat and thin geometry. It will provide the ability to cool the future generations of power intensive microprocessor chips and circuit boards in an efficient way. It also brings the potential to function in high temperature (>150°C) fields because of its high yield strength and compatibility [1]. The TGP is fabricated with Titanium. It adopts the recently developed high aspect ratio Ti processing techniques [2] and laser packaging techniques. The three main components of the TGP are 1) a fine wick structure based on arrays of high aspect ratio Ti pillars and hair like structures of Nano-Structured Titania (NST), 2) A shallow Ti cavity welded onto the wick structure and 3) the working fluid, water, sealed between the cavity and the wick. The heat carrying capacity and the thermal conductivity of a heat pipe are generally determined by the speed of capillary flow of the working fluid through its wick. The TGP wick has the potential to generate high flow rates and to meet the growing challenges faced by electronics cooling community. The TGP wick structure, developed by etching high aspect ratio pillars in a titanium substrate and growing nano scale hairs on the surface of the pillars, is super hydrophilic and capable of wicking water at velocities ∼ 10−2 m/s over distances of several centimeters. The thermal conductivity of the current TGP device was measured to be k = 350 W/m·K. The completed TGP device has the potential of attaining a higher conductivity by improving the wicking material and of carrying higher power density. Washburn equation [3] for dynamics of capillary flow has been employed to explain the results of our experiments. The experiment shows a good agreement with Washburn equation.
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ASME 2008 International Mechanical Engineering Congress and Exposition
October 31–November 6, 2008
Boston, Massachusetts, USA
Conference Sponsors:
- ASME
ISBN:
978-0-7918-4874-6
PROCEEDINGS PAPER
A Titanium Based Flat Heat Pipe
Changsong Ding
,
Changsong Ding
University of California - Santa Barbara, Santa Barbara, CA
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Gaurav Soni
,
Gaurav Soni
University of California - Santa Barbara, Santa Barbara, CA
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Payam Bozorgi
,
Payam Bozorgi
University of California - Santa Barbara, Santa Barbara, CA
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Brian Piorek
,
Brian Piorek
University of California - Santa Barbara, Santa Barbara, CA
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Carl D. Meinhart
,
Carl D. Meinhart
University of California - Santa Barbara, Santa Barbara, CA
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Noel C. MacDonald
Noel C. MacDonald
University of California - Santa Barbara, Santa Barbara, CA
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Changsong Ding
University of California - Santa Barbara, Santa Barbara, CA
Gaurav Soni
University of California - Santa Barbara, Santa Barbara, CA
Payam Bozorgi
University of California - Santa Barbara, Santa Barbara, CA
Brian Piorek
University of California - Santa Barbara, Santa Barbara, CA
Carl D. Meinhart
University of California - Santa Barbara, Santa Barbara, CA
Noel C. MacDonald
University of California - Santa Barbara, Santa Barbara, CA
Paper No:
IMECE2008-68967, pp. 1045-1051; 7 pages
Published Online:
August 26, 2009
Citation
Ding, C, Soni, G, Bozorgi, P, Piorek, B, Meinhart, CD, & MacDonald, NC. "A Titanium Based Flat Heat Pipe." Proceedings of the ASME 2008 International Mechanical Engineering Congress and Exposition. Volume 13: Nano-Manufacturing Technology; and Micro and Nano Systems, Parts A and B. Boston, Massachusetts, USA. October 31–November 6, 2008. pp. 1045-1051. ASME. https://doi.org/10.1115/IMECE2008-68967
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