Thermal conductivity improvement in carbon nanoparticle doped PAO oil

Thermal conductivity improvement in carbon nanoparticle doped PAO oil

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Unformatted text preview: Thermal conductivity improvement in carbon nanoparticle doped PAO oil: An experimental study S. Shaikh a ! and K. Lafdi University of Dayton, 300 College Park, Dayton, Ohio 45469 R. Ponnappan AFRL/PRPS, Power Division, Wright Patterson AFB, Ohio 45433 s Received 7 December 2006; accepted 13 January 2007; published online 16 March 2007 d The present work involves a study on the thermal conductivity of nanoparticle-oil suspensions for three types of nanoparticles, namely, carbon nanotubes s CNTs d , exfoliated graphite s EXG d , and heat treated nanofibers s HTT d with PAO oil as the base fluid. To accomplish the above task, an experimental analysis is performed using a modern light flash technique s LFA 447 d for measuring the thermal conductivity of the three types of nanofluids, for different loading of nanoparticles. The experimental results show a similar trend as observed in literature for nanofluids with a maximum enhancement of approximately 161 % obtained for the CNT-PAO oil suspension. The overall percent enhancements for different volume fractions of the nanoparticles are highest for the CNT-based nanofluid, followed by the EXG and the HTT. The findings from this study for the three different types of carbon nanoparticles can have great potential in the field of thermal management. © 2007 American Institute of Physics . f DOI: 10.1063/1.2710337 g I. INTRODUCTION Low thermal conductivity is a primary limitation in the development of energy efficient heat transfer fluids required in many industrial and commercial applications. The heat rejection requirements are continually increasing due to trends toward faster speeds s in the multigigahertz range d and smaller features s to , 100 nm d for microelectronic devices, more power output for engines, and brighter beams for opti- cal devices. Cooling becomes one of the top technical chal- lenges facing high-tech industries such as microelectronics, transportation, manufacturing, and metrology. Conventional methods to increase heat flux rates include extended surfaces such as fins and microchannels and/or increasing flow rates by increasing pumping power. However, current design solutions already push the available technology to its limits. Conventional heat transfer fluids have inherently poor thermal conductivity compared to solids s see Fig. 1 d . Conventional fluids that contain millimeter- or micrometer-sized particles do not work with the emerging miniaturized technologies because they can clog the tiny channels of these devices. New technologies and new advanced fluids with the po- tential to improve flow and thermal characteristics are of critical importance. Inclusion of high thermal conductivity particles inside the fluid is a promising way toward enhanc- ing thermal properties of fluids. The idea of increasing heat transfer in fluids by suspending conductive particles was first addressed by Maxwell....
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This note was uploaded on 03/18/2012 for the course PHYSICS 303 taught by Professor Ihn during the Spring '12 term at Swiss Federal Institute of Technology Zurich.

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Thermal conductivity improvement in carbon nanoparticle doped PAO oil

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