Particle size effects in the thermal conductivity enhancement of copper-based nanofluids

We present an analysis of the dispersion characteristics and thermal conductivity performance of copper-based nanofluids. The copper nanoparticles were prepared using a chemical reduction methodology in the presence of a stabilizing surfactant, oleic acid or cetyl trimethylammonium bromide (CTAB). Nanofluids were prepared using water as the base fluid with copper nanoparticle concentrations of 0.55 and 1.0 vol.%. A dispersing agent, sodium dodecylbenzene sulfonate (SDBS), and subsequent ultrasonication was used to ensure homogenous dispersion of the copper nanopowders in water. Particle size distribution of the copper nanoparticles in the base fluid was determined by dynamic light scattering. We found that the 0.55 vol.% Cu nanofluids exhibited excellent dispersion in the presence of SDBS. In addition, a dynamic thermal conductivity setup was developed and used to measure the thermal conductivity performance of the nanofluids. The 0.55 vol.% Cu nanofluids exhibited a thermal conductivity enhancement of approximately 22%. In the case of the nanofluids prepared from the powders synthesized in the presence of CTAB, the enhancement was approximately 48% over the base fluid for the 1.0 vol.% Cu nanofluids, which is higher than the enhancement values found in the literature. These results can be directly related to the particle/agglomerate size of the copper nanoparticles in water, as determined from dynamic light scattering.

[1]  Arun Majumdar,et al.  Transient ballistic and diffusive phonon heat transport in thin films , 1993 .

[2]  William W. Yu,et al.  ANOMALOUSLY INCREASED EFFECTIVE THERMAL CONDUCTIVITIES OF ETHYLENE GLYCOL-BASED NANOFLUIDS CONTAINING COPPER NANOPARTICLES , 2001 .

[3]  Chi-Chuan Wang,et al.  Enhancement of thermal conductivity with Cu for nanofluids using chemical reduction method , 2006 .

[4]  Lei Chen,et al.  The use of CTAB to control the size of copper nanoparticles and the concentration of alkylthiols on their surfaces , 2006 .

[5]  Shuo Yang,et al.  Investigation of pH and SDBS on enhancement of thermal conductivity in nanofluids , 2009 .

[6]  Hua Li,et al.  Thermal conductivity enhancement dependent pH and chemical surfactant for Cu-H2O nanofluids , 2008 .

[7]  S. Phillpot,et al.  Mechanisms of heat flow in suspensions of nano-sized particles (nanofluids) , 2002 .

[8]  Huaqing Xie,et al.  Thermal conductivity enhancement of suspensions containing nanosized alumina particles , 2002 .

[9]  Seok Pil Jang,et al.  Flow and convective heat transfer characteristics of water-based Al2O3 nanofluids in fully developed laminar flow regime , 2009 .

[10]  O. Graeve,et al.  DYNAMIC LIGHT SCATTERING STUDY OF REVERSE MICELLAR SYSTEMS FOR THE SYNTHESIS OF IRON-BASED NANOFLUIDS , 2007 .

[11]  Yang Jian-guang,et al.  A new method for preparing hydrophobic nano-copper powders , 2007 .

[12]  J. Eastman,et al.  Measuring Thermal Conductivity of Fluids Containing Oxide Nanoparticles , 1999 .

[13]  W. Roetzel,et al.  Conceptions for heat transfer correlation of nanofluids , 2000 .

[14]  O. Graeve,et al.  A Solvothermal Approach for the Preparation of Nanostructured Carbide and Boride Ultra-High-Temperature Ceramics , 2010 .

[15]  H. Masuda,et al.  ALTERATION OF THERMAL CONDUCTIVITY AND VISCOSITY OF LIQUID BY DISPERSING ULTRA-FINE PARTICLES. DISPERSION OF AL2O3, SIO2 AND TIO2 ULTRA-FINE PARTICLES , 1993 .

[16]  V. Iyer,et al.  Radiation induced synthesis and characterization of copper nanoparticles , 1998 .

[17]  S. R. Casolco,et al.  Synthesis and Consolidation of BaAl2Si2O8:Eu: Development of an Integrated Process for Luminescent Smart Ceramic Materials , 2009 .

[18]  P. Dutta,et al.  Molecular layering in a liquid on a solid substrate: an X-ray reflectivity study , 2000 .

[19]  M. M. Chen,et al.  Microconvective Thermal Conductivity in Disperse Two-Phase Mixtures as Observed in a Low Velocity Couette Flow Experiment , 1981 .

[20]  O. Graeve,et al.  Luminescence variations in hydroxyapatites doped with Eu2+ and Eu3+ ions. , 2010, Biomaterials.

[21]  Y. Xuan,et al.  Investigation on Convective Heat Transfer and Flow Features of Nanofluids , 2003 .

[22]  Xianju Wang,et al.  Evaluation on dispersion behavior of the aqueous copper nano-suspensions. , 2007, Journal of colloid and interface science.

[23]  O. K. Crosser,et al.  Thermal Conductivity of Heterogeneous Two-Component Systems , 1962 .

[24]  K. Kontturi,et al.  Influence of ligand structure on the stability and oxidation of copper nanoparticles. , 2008, Journal of colloid and interface science.

[25]  P. Khanna,et al.  Synthesis of oleic acid capped copper nano-particles via reduction of copper salt by SFS , 2008 .

[26]  Huaqing Xie,et al.  Effect of interfacial nanolayer on the effective thermal conductivity of nanoparticle-fluid mixture , 2005 .

[27]  O. Graeve,et al.  Analysis of Particle and Crystallite Size in Tungsten Nanopowder Synthesis , 2010 .

[28]  F. Gordaninejad,et al.  A comparative study of thermal behavior of iron and copper nanofluids , 2009 .

[29]  Lei Chen,et al.  Study on the Tribological Behaviors of N,N-dioctyldithiocarbamate Monolayer-Stabilized Copper Nanoparticles in Liquid Paraffin , 2009 .

[30]  T. Bessho,et al.  Synthesis of copper monolayer and particles at aqueous–organic interface , 2006 .

[31]  Anjali A. Athawale,et al.  Synthesis of CTAB–IPA reduced copper nanoparticles , 2005 .

[32]  S. Advani,et al.  Role of micro-convection due to non-affine motion of particles in a mono-disperse suspension , 1995 .

[33]  Frank van Swol,et al.  On the interface between a fluid and a planar wall , 1984 .

[34]  P. J. McKinney,et al.  American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED , 1988 .

[35]  Y. Xuan,et al.  Heat transfer enhancement of nanofluids , 2000 .

[36]  Xianfan Xu,et al.  Thermal Conductivity of Nanoparticle -Fluid Mixture , 1999 .

[37]  Szu-Han Wu,et al.  Synthesis of high-concentration Cu nanoparticles in aqueous CTAB solutions. , 2004, Journal of colloid and interface science.

[38]  J. Eastman,et al.  Novel Thermal Properties of Nanostructured Materials , 1999 .

[39]  Yang Li,et al.  Investigation on the thermal transport properties of ethylene glycol-based nanofluids containing copper nanoparticles , 2010 .

[40]  O. Graeve,et al.  Synthesis and Characterization of Luminescent Yttrium Oxide Doped with Tm and Yb , 2006 .

[41]  Stephen U. S. Choi.  Enhancing thermal conductivity of fluids with nano-particles , 1995 .

[42]  Hongwei Xie,et al.  Thermal Conductivity of Suspensions Containing Nanosized SiC Particles , 2002 .

[43]  R. Misra,et al.  Biomaterials , 2008 .

[44]  Synthesis of Cu Nanoparticles for Preparation of Nanofluids , 2008 .