| Title: |
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. |
| Authors: |
Lang, Stefanie1 (AUTHOR), Pollak, Stefan1 (AUTHOR) pollak@fvt.rub.de, Frerich, Sulamith1 (AUTHOR) |
| Source: |
Fluid Phase Equilibria. Jun2019, Vol. 490, p92-100. 9p. |
| Subject Terms: |
*CARBON dioxide, *POLYDIMETHYLSILOXANE, *MEASURING instruments, *GASES, *THERMAL conductivity, *MOLECULAR weights |
| Abstract: |
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. Highlights • The thermal conductivity of mixtures of carbon dioxide and a linear polydimethylsiloxane was measured. • Two different sensors for measuring thermal conductivity under high pressure were designed, tested and compared. • The repeatability of the results of the needle sensor was found to be better than 0.7%. • The short hot wire delivered the more reliable results under pressure. • The maximum pressure investigated was 16 MPa. [ABSTRACT FROM AUTHOR] |
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