A model based on the concepts of free volume and activation energy was proposed to correlate fluid thermal conductivity. Firstly

the validity of this model was tested in terms of the results of molecular simulation on the square well fluid. Then

a correlation of liquid thermal conductivity with the heat of vaporization was derived by introducing the cell theory for liquids. For 40 diverse systems encountered in practice

the grand absolute average deviation is 1. 78 percent for 569 data points. Finally

a two parameter model correlating liquid thermal conductivity with temperature was presented. The correlation results of this model indicate that our method is superior to Jamieson model in a wide temperature range for most substances tested in this work.