Enhancement of fluid thermal conductivity by the addition of single and hybrid nano-additives

The inherent high thermal conductivity of many nanomaterials has a great potential for enhancing fluidic heat transfer applications. Conductive nanomaterials such as carbon nanotubes (CNTs), copper nanoparticles (CuNPs) and gold nanoparticles (AuNPs), as well as their hybrids such as CNT–CuNP or CNT...

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Bibliographic Details
Published inThermochimica acta Vol. 462; no. 1; pp. 45 - 55
Main Authors Jana, Soumen, Salehi-Khojin, Amin, Zhong, Wei-Hong
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 15.10.2007
Elsevier Science
Subjects
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Heat transfer
Nanofluid
Nanomaterial
Other topics in heat transfer
Other topics in heat transfer, thermal and thermodynamic processes
Physics
Thermal conductivity
UV–vis–NIR spectrum
Thermal conductivity
UV–vis–NIR spectrum
Nanofluid
Nanomaterial
Water
Scanning electron microscopy
Gold
Additives
Carbon nanotubes
Surface structure
Nanoparticles
Thermal properties
Near infrared spectrometry
Fluids
Composite materials
Transmission electron microscopy
Transition elements
Morphology
UV-vis-NIR spectrum
Copper
Nanostructured materials
Ultraviolet visible spectrometry
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Summary:The inherent high thermal conductivity of many nanomaterials has a great potential for enhancing fluidic heat transfer applications. Conductive nanomaterials such as carbon nanotubes (CNTs), copper nanoparticles (CuNPs) and gold nanoparticles (AuNPs), as well as their hybrids such as CNT–CuNP or CNT–AuNP were used in this study to enhance the thermal conductivity of fluids. Mono-type nanoparticle suspensions showed the greatest enhancement in thermal conductivity, among which the enhancement with CuNPs was the highest. Hybrid suspensions did not show the same degree of improvement. The experimentally measured thermal conductivities of several nanofluids were consistently greater than the theoretical predictions obtained from existing models. Mechanisms for the thermal conductivity enhancement are discussed. The stability of nanofluids was estimated by UV–vis–NIR spectrophotometer and it was observed that the stability was influenced by characteristics of nanoparticles.
ISSN:0040-6031
1872-762X
DOI:10.1016/j.tca.2007.06.009