With the increase in power consumption in compact electronic devices, passive heat transfer cooling technologies with high-heat-flux characteristics are highly desired in microelectronic industries. Carbon nanotube (CNT) clusters have high thermal conductivity, nanopore size, and large porosity and can be used as wick structure in a heat pipe heatspreader to provide high capillary force for high-heat-flux thermal management. This paper reports investigations of high-heat-flux cooling of the CNT biwick structure, associated with the development of a reliable thermometer and high performance heater. The thermometer/heater is a 100-nm-thick and wide Z-shaped platinum wire resistor, fabricated on a thermally oxidized silicon substrate of a CNT sample to heat a wick area. As a heater, it provides a direct heating effect without a thermal interface and is capable of high-temperature operation over . As a thermometer, reliable temperature measurement is achieved by calibrating the resistance variation versus temperature after the annealing process is applied. The thermally oxidized layer on the silicon substrate is around -thick and pinhole-free, which ensures the platinum thermometer/heater from the severe CNT growth environments without any electrical leakage. For high-heat-flux cooling, the CNT biwick structure is composed of tall and wide stripelike CNT clusters with stripe-spacers. Using CNT biwick samples, experiments are completed in both open and saturated environments. Experimental results demonstrate heat transfer capacity and good thermal and mass transport characteristics in the nanolevel porous media.
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Research Papers
Design and Test of Carbon Nanotube Biwick Structure for High-Heat-Flux Phase Change Heat Transfer
Qingjun Cai,
e-mail: qcai@teledyne.com
Qingjun Cai
Teledyne Scientific & Imaging
, 1049 Camino Dos Rios, Thousand Oaks, CA 91360
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Chung-Lung Chen
Chung-Lung Chen
Teledyne Scientific & Imaging
, 1049 Camino Dos Rios, Thousand Oaks, CA 91360
Search for other works by this author on:
Qingjun Cai
Teledyne Scientific & Imaging
, 1049 Camino Dos Rios, Thousand Oaks, CA 91360e-mail: qcai@teledyne.com
Chung-Lung Chen
Teledyne Scientific & Imaging
, 1049 Camino Dos Rios, Thousand Oaks, CA 91360J. Heat Transfer. May 2010, 132(5): 052403 (8 pages)
Published Online: March 9, 2010
Article history
Received:
June 19, 2009
Revised:
September 23, 2009
Online:
March 9, 2010
Published:
March 9, 2010
Citation
Cai, Q., and Chen, C. (March 9, 2010). "Design and Test of Carbon Nanotube Biwick Structure for High-Heat-Flux Phase Change Heat Transfer." ASME. J. Heat Transfer. May 2010; 132(5): 052403. https://doi.org/10.1115/1.4000469
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