A study on the characteristics of carbon nanofluid for heat transfer enhancement of heat pipe |
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| Affiliation: | 1. Campus UFV-Florestal, Universidade Federal de Viçosa, CEP 35690-000, Florestal, Minas Gerais, Brazil;2. Departamento de Física e Matemática, Centro Federal de Educação Tecnológica de Minas Gerais, CEP 30510-000, Belo Horizonte, Minas Gerais, Brazil;3. Departamento de Física, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, CP 702, CEP 30123-970, Belo Horizonte, Minas Gerais, Brazil;1. Fluids & Thermal Engineering Research Group, Faculty of Engineering, University of Nottingham, United Kingdom;2. Fluids & Thermal Engineering Research Centre, University of Nottingham Ningbo, China |
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| Abstract: | For the purposes of enhancing the heat-transfer utility of the heat pipe in a solar collector, the present work attempted to improve nanoparticle dispersion stability by means of a chemical reformation process wherein nanofluid is formulated with hydroxyl radicals combined with oxidized multi-walled CNTs (MWCNTs). Experiments entailing measurements of thermal conductivity and viscosity in distilled water as functions of temperature were carried out to determine the best nanoparticle mixture ratio. The thermal conductivity increased with the increasing volumetric ratio of the oxidized MWCNTs and with increasing temperature. The viscosity also increased, slowly, until its concentration reached 0.01%, and then steeply increased, and was lower at high temperature. |
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| Keywords: | Thermal conductivity Oxidized carbon nanotubes Viscosity Transient hot-wire method Volumetric ratio |
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