Nano Science and Technology Institute
Nanotech 2012 Vol. 2
Nanotech 2012 Vol. 2
Nanotechnology 2012: Electronics, Devices, Fabrication, MEMS, Fluidics and Computational (Volume 2)
Chapter 5: Micro & Nano Fluidics

Study on the Heat Transfer Capability of Silicon Carbide - Ethylene Glycol Nanofluid

Authors:S. Bobbo, L. Colla, M. Scattolini, L. Fedele
Affilation:Consiglio Nazionale delle Ricerche, IT
Pages:345 - 348
Keywords:nanofluid, ethylene glycol, SiC, thermal conductivity, dynamic viscosity, heat transfer coefficient
Abstract:Ethylene glycol-based nanofluids containing silicon carbide (SiC) in the concentrations 0.1, 1 and 5 wt% were characterized, in order to understand their potentiality to improve the heat transfer efficiency of the base fluid. Measurements performed almost every day for 30 days by means of a nanosizer based on Dynamic Light Scattering (DLS) technique, showed always only one nanoparticles population with an average diameter of 110-120 nm, indicating stable nanofluids. Thermal conductivity was measured by a hot disk apparatus in the temperature range between 10°C and 70°C with an estimated accuracy better than 2%. Dynamic viscosity (μ) was measured by a magnetic suspension rheometer with plate-cone geometry in the temperature range between 10°C and 90°C. The fluids show thermal conductivity (λ) increment more than proportional to the increment of nanoparticle concentration at given temperature. Moreover, λ increases with temperature. Dynamic viscosity increment is small at low nanoparticle concentrations and significant at 5%wt concentration. Viscosity decrease at increasing temperature. Finally, the heat transfer coefficient of the nanofluid at 1 wt% is measured in a dedicated apparatus around ambient temperature at different Reynolds numbers flow rate. Reynolds and Nusselt numbers are calculated by using thermal conductivity and viscosity values previously measured.
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