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Thermal and rheological properties of micro- and nanofluids of copper in diethylene glycol – as heat exchange liquid

Published online by Cambridge University Press:  29 May 2013

Nader Nikkam ,
Morteza Ghanbarpour ,
Mohsin Saleemi ,
Muhammet S. Toprak ,
Mamoun Muhammed  and
Rahmatollah Khodabandeh
Nader Nikkam
Affiliation:
Department of Materials and Nano Physics, KTH- Royal Institute of Technology, SE-16440 Kista, Stockholm, Sweden.
Morteza Ghanbarpour
Affiliation:
Department of Energy Technology, KTH- Royal Institute of Technology, SE-100 44 Stockholm, Sweden
Mohsin Saleemi
Affiliation:
Department of Materials and Nano Physics, KTH- Royal Institute of Technology, SE-16440 Kista, Stockholm, Sweden.
Muhammet S. Toprak*
Affiliation:
Department of Materials and Nano Physics, KTH- Royal Institute of Technology, SE-16440 Kista, Stockholm, Sweden.
Mamoun Muhammed
Affiliation:
Department of Materials and Nano Physics, KTH- Royal Institute of Technology, SE-16440 Kista, Stockholm, Sweden.
Rahmatollah Khodabandeh
Affiliation:
Department of Energy Technology, KTH- Royal Institute of Technology, SE-100 44 Stockholm, Sweden
*
*Email: toprak@kth.se
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Abstract

This study reports on the fabrication of nanofluids/microfluids (NFs/MFs) with experimental and theoretical investigation of thermal conductivity (TC) and viscosity of diethylene glycol (DEG) base NFs/MFs containing copper nanoparticles (Cu NPs) and copper microparticles (Cu MPs). For this purpose, Cu NPs (20-40 nm) and Cu MPs (0.5-1.5 μm) were dispersed in DEG with particle loading between 1 wt% and 3 wt%. Ultrasonic agitation was used for dispersion and preparation of stable NFs/MFs, and thus the use of surfactants was avoided. The objectives were investigation of impact of size of Cu particle and concentration on TC and viscosity of NFs/MFs on DEG as the model base liquid. The physicochemical properties of all particles and fluids were characterized by using various techniques including Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM) and Dynamic Light Scattering (DLS) techniques. Fourier Transform Infrared Spectroscopy (FTIR) analysis was performed to study particles’ surfaces. NFs and MFs exhibited a higher TC than the base liquid, while NFs outperformed MFs showing a potential for their use in heat exchange applications. The TC and viscosity of NFs and MFs were presented, along with a comparison with values from predictive models. While Maxwell model was good at predicting the TC of MFs, it underestimated the TC of NFs, revealing that the model is not directly applicable to the NF systems.

Keywords

thermal conductivityfluidnanostructure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1543: Symposium V – Nanoscale Thermoelectric Materials, Transport Phenomena, and Applications to Solid-State Cooling and Power Generation , 2013 , pp. 165 - 170
Copyright
Copyright © Materials Research Society 2013 

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