TED-AJ03-384 STABLE AND HIGHLY CONDUCTIVE NANOFLUIDS-EXPERIMENTAL AND THEORETICAL STUDIES

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概要

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• Applying nanotechnology to established thermal energy engineering, Argonne National Laboratory has developed the concept of "nanofluids"-mixtures of nanosize solid particles stably suspended in liquids. Stable and highly conductive nanofluids were produced by one- and two-step production methods. The effective thermal conductivities of these nanofluids were measured with a transient hot-wire apparatus. The measurements showed that nanofluids possess extremely high thermal conductivities compared to their base liquids without dispersed nanoparticles. This high thermal conductivity, together with excellent nanoparticle suspension stability, makes nanofluids promising heat transfer fluids for numerous engineering applications, such as engine coolants. While presenting new potential applications, nanofluids also offer theoretical challenges because the measured thermal conductivity enhancement is an order of magnitude greater than predicted by existing theories. Several physical concepts for understanding this anomalous thermal behavior are described. This paper presents a simplified nanoconvection model to estimate the nanofluid thermal conductivity. We found that, if the thermophoretically drifting particles drag a modest amount of the surrounding fluid with them, the contribution to the thermal conductivity is approximately the amount needed to account for the anomalously high thermal conductivity enhancements reported in recent measurements.

• 一般社団法人日本機械学会の論文

著者

• Hull John

  Energy Technology Division Argonne National Laboratory

• Yu Wenhua

  Energy Technology Division Argonne National Laboratory

• Choi Stephen

  Energy Technology Division Argonne National Laboratory

関連論文

• TED-AJ03-384 STABLE AND HIGHLY CONDUCTIVE NANOFLUIDS-EXPERIMENTAL AND THEORETICAL STUDIES

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