JMS_V4_N2_RP3 Thermal Conductivity of Fly Ash Cenospheres for Variable Particle Size Ranges Craig Menezes Ajit P. Rathod Kailas L. Wasewar Journal on Material Science 2347–615X 4 2 19 23 Cenosphere, Thermal Conductivity, Concentric Sphere Method Thermal conductivity of a material is a physical property of significant importance in the field of engineering. In the present study, the thermal conductivity of cenospheres have been experimentally determined for particle diameter size ranges of < 105 μm, 105 μm to 180 μm, and > 180 μm using concentric spheres method. The experimentally estimated thermal conductivity of cenosphere has been found to be in the range of 0.128 - 0.365 W/mK which is comparable with literature. July – September 2016 Copyright © 2016 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=8126