Effect of Aggregation Kinetics on the Thermal Conductivity of Nanoscale Colloidal Solutions (Nanofluid)
- 15 June 2006
- journal article
- letter
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 6 (7), 1529-1534
- https://doi.org/10.1021/nl060992s
Abstract
The thermal conductivity, k, of nanoscale colloidal suspensions (also known as nanofluid), consisting of nanoparticles suspended in a base liquid, is much higher than the thermal conductivity of the base liquid at very small volume fractions of the nanoparticles. However, experimental results from various groups all across the world have shown various anomalies such as a peak in the enhancement of k with respect to nanoparticle size, an increase as well as a decrease in the ratio of k of these colloidal solutions with the k of the base fluid with increasing temperature, and a dependence of k on pH and time. In this paper, the aggregation kinetics of nanoscale colloidal solutions are combined with the physics of thermal transport to capture the effects of aggregation on k. Results show that the observed anomalies reported in experimental work can be well described by taking aggregation kinetics into account. Finally, we show that colloidal chemistry plays a significant role in deciding the k of colloidal nanosuspensions.Keywords
This publication has 28 references indexed in Scilit:
- A New Parameter to Control Heat Transport in Nanofluids: Surface Charge State of the Particle in SuspensionThe Journal of Physical Chemistry B, 2006
- Brownian-Motion-Based Convective-Conductive Model for the Effective Thermal Conductivity of NanofluidsJournal of Heat Transfer, 2005
- Thermal Conductivity of Nanoscale Colloidal Solutions (Nanofluids)Physical Review Letters, 2005
- Experimental investigation into convective heat transfer of nanofluids at the entrance region under laminar flow conditionsInternational Journal of Heat and Mass Transfer, 2004
- Thermal conductivities of naked and monolayer protected metal nanoparticle based nanofluids: Manifestation of anomalous enhancement and chemical effectsApplied Physics Letters, 2003
- A fractal model for predicting the effective thermal conductivity of liquid with suspension of nanoparticlesInternational Journal of Heat and Mass Transfer, 2003
- Mechanisms of heat flow in suspensions of nano-sized particles (nanofluids)International Journal of Heat and Mass Transfer, 2002
- Electrolyte-Induced Aggregation of Acrylic Latex. 1. Dilute Particle ConcentrationsLangmuir, 2001
- Alteration of Thermal Conductivity and Viscosity of Liquid by Dispersing Ultra-Fine Particles. Dispersion of Al2O3, SiO2 and TiO2 Ultra-Fine Particles.Netsu Bussei, 1993
- The effect of particle size on the thermal conductivity of ZnS/diamond compositesActa Metallurgica et Materialia, 1992