Measurement and modeling of liquid thermal conductivity of linear siloxanes: Octamethyltrisiloxane (MDM) and Hexamethyldisiloxane (MM)

Abstract

In this work, the thermal conductivity data of Octamethyltrisiloxane (MDM) and Hexamethyldisiloxane (MM) were measured by the transient hot wire method, in the temperature range of 263.15 K to 353.15 K and the pressures ranging from 0.1 MPa to 7.0 MPa, with an uncertainty of 3.5 % for MDM and 3.8 % for MM. Then a comparison between the present data and previously reported thermal conductivities was made, indicating a good agreement. Additionally, a thermal conductivity model based on the modified Enskog theory was used to represent the experimental data. This study provides a necessary basis for the calculation and analysis of the heat transfer of typical linear siloxanes for the organic Rankine cycle.