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Development of a method to measure the thermal conductivity of pressurised solutions containing dense gases using 11000 g/mol polydimethylsiloxane and carbon dioxide as example fluid

Lang, S. and Pollak, S. and Frerich, S.

FLUID PHASE EQUILIBRIA
Volume: 490 Pages: 92-100
DOI: 10.1016/j.fluid.2019.03.005
Published: 2019

Abstract
The development of a method to measure the thermal conductivity of mixtures containing pressurised gases is presented. As example fluid, we use carbon dioxide mixed with a linear polydimethylsiloxane (PDMS) with a molecular weight of 11000 g/mol. Experiments were carried out at 25 °C, 40 °C and 60 °C in a pressure range of up to 16 MPa. Thermal conductivity was measured in a high-pressure view cell using two different sensors: a cylindrical needle sensor and a short hot wire. Both sensors are based on the principle of a transient linear heat source. Their applicability was compared and evaluated. Rather low molecular weight polydimethylsiloxane was chosen as model substance to close the data gap regarding the thermal conductivity of gas saturated solutions, pressurised with carbon dioxide. All experiments were carried out under isothermal conditions. It was the aim of the present work to develop and to test an adequate measuring instrument; this involves the selection and implementation of appropriate auxiliary equipment, too. © 2019 Elsevier B.V.

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