Table of Contents
Journal of Thermodynamics
Volume 2011 (2011), Article ID 464368, 5 pages
http://dx.doi.org/10.1155/2011/464368
Research Article

Photoacoustic Method for Measurement of Thermal Effusivity of Fe3O4 Nanofluid

Department of Aerospace Engineering, Defence Institute of Advanced Technology (DU), Girinagar, Pune 411 025, Maharashtra, India

Received 17 November 2010; Revised 10 February 2011; Accepted 28 February 2011

Academic Editor: Pedro Jorge Martins Coelho

Copyright © 2011 Vijay S. Raykar and Ashok K. Singh. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Photoacoustic (PA) sensor was designed and developed to evaluate thermal effusivity of Fe3O4 nanofluid. The PA sensor is based on open cell mode (OPC) to measure acoustic signals from low concentration of nanoparticulate suspensions in ethylene glycol (EG). Spherical Fe3O4 nanoparticles (NPs) were obtained by chemical precipitation method in powder form. The obtained NPs were stabilized by acetylacetone (acac) in EG. Thermal conductivity estimation was carried out with the help of transient hot wire method. The developed PA sensor was calibrated by measuring thermal effusivity of standard samples. The acoustic signals of the PA experiments have been analyzed with a simple Rosencwaig-Gersho theoretical model.