Effect of alumina nanoparticles in the fluid on heat transfer in double-pipe heat exchanger system |
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Authors: | Byung-Hee Chun Hyun Uk Kang Sung Hyun Kim |
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Affiliation: | (1) Department of Chemical and Biological Engineering, Applied Rheology Center, Korea University, Seoul, 136-701, Korea |
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Abstract: | This study was performed to investigate the convective heat transfer coefficient of nanofluids made of several alumina nanoparticles and transformer oil which flow through a double pipe heat exchanger system in the laminar flow regime. The nanofluids exhibited a considerable increase of heat transfer coefficients. Although the thermal conductivity of alumina is not high, it is much higher than that of the base fluids. The nanofluids tested displayed good thermal properties. One of the possible reasons for the enhancement on heat transfer of nanofluids can be explained by the high concentration of nanoparticles in the thermal boundary layer at the wall side through the migration of nanoparticles. To understand the enhancement of heat transfer of nanofluid, an experimental correlation was proposed for an alumina-transformer oil nanofluid system. |
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Keywords: | Convective Heat Transfer Heat Transfer Coefficient Nanofluid Alumina Nanoparticle Laminar Flow |
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