The effects of temperature, volume fraction and vibration time on the thermo-physical properties of a carbon nanotube suspension (carbon nanofluid)
- 17 June 2008
- journal article
- Published by IOP Publishing in Nanotechnology
- Vol. 19 (31), 315701
- https://doi.org/10.1088/0957-4484/19/31/315701
Abstract
In this investigation, nanofluids of carbon nanotubes are prepared and the thermal conductivity and volumetric heat capacity of these fluids are measured using a thin layer technique as a function of time of ultrasonication, temperature, and volume fraction. It has been observed that after using the ultrasonic disrupter, the size of agglomerated particles and number of primary particles in a particle cluster was significantly decreased and that the thermal conductivity increased with elapsed ultrasonication time. The clustering of carbon nanotubes was also confirmed microscopically. The strong dependence of the effective thermal conductivity on temperature and volume fraction of nanofluids was attributed to Brownian motion and the interparticle potential, which influences the particle motion. The effect of temperature will become much more evident with an increase in the volume fraction and the agglomeration of the nanoparticles, as observed experimentally. The data obtained from this work have been compared with those of other studies and also with mathematical models at present proven for suspensions. Using a 2.5% volumetric concentration of carbon nanotubes resulted in a 20% increase in the thermal conductivity of the base fluid (ethylene glycol).The volumetric heat capacity also showed a pronounced increase with respect to that of the pure base fluid.This publication has 20 references indexed in Scilit:
- Experimental investigation of temperature and volume fraction variations on the effective thermal conductivity of nanoparticle suspensions (nanofluids)Journal of Applied Physics, 2006
- Enhancement of thermal conductivity with carbon nanotube for nanofluidsInternational Communications in Heat and Mass Transfer, 2005
- Enhanced thermal conductivity of TiO2—water based nanofluidsInternational Journal of Thermal Sciences, 2005
- Heat transfer enhancement of copper nanofluid with acoustic cavitationInternational Journal of Heat and Mass Transfer, 2004
- Pool boiling of nano-fluids on horizontal narrow tubesInternational Journal of Multiphase Flow, 2003
- Pool boiling characteristics of nano-fluidsInternational Journal of Heat and Mass Transfer, 2003
- Natural convection of nano-fluidsHeat and Mass Transfer, 2002
- Mechanisms of heat flow in suspensions of nano-sized particles (nanofluids)International Journal of Heat and Mass Transfer, 2002
- Measuring Thermal Conductivity of Fluids Containing Oxide NanoparticlesJournal of Heat Transfer, 1999
- Thermal Conductivity of Heterogeneous Two-Component SystemsIndustrial & Engineering Chemistry Fundamentals, 1962