Institute for Thermo- and Fluiddynamics
In cooperation with the Paderborn University and the TU Berlin, density and speed of sound measurements for methyl diethanolamine were conducted in wide temperature and pressure ranges. Based on these data and all other thermodynamic property data available in the literature an equation of state in terms of the Helmholtz energy was developed.
The experimental data and the equation of state are published in the International Journal of Thermophysics and are available open-access thanks to Projekt DEAL: https://doi.org/10.1007/s10765-021-02933-7
Highly accurate speed of sound data for liquid propylene glycol were measured using the pulse-echo technique. These data were subsequently used to develop a fundamental equation of state in terms of the Helmholtz energy. For the first time, it allows accurate and consistent calculation of all thermodynamic state variables of propylene glycol.
This equation was developed in cooperation with the NIST (Boulder, USA) and has been published in the Journal of Physical and Chemical Reference Data: https://doi.org/10.1063/5.0050021
Every three years the National Institute of Standards and Technology (NIST), the ASME and the AIChE organize the Symposium on Thermophysical Properties in Boulder, Colorado – the most important international conference for the property related research at the chair of thermodynamics. In normal times the chair has always been represented by several researchers presenting talks and posters in Boulder. However, times are not normal. This year, the thermodynamics team of RUB could only present its results virtually. But still one statement holds (once more): our team was among the most represented groups worldwide.
The circular use of nitrogen as an important plant nutrient plays an essential role in the transition to a sustainable economy. The Adsorption of nitrogen at chars can distribute to this goal. A cooperation between the chair of thermodynamics and the Future Energy Center of Mäladalens Högskola (MDH) aimes to characterize pyrochar, hydrochar, and lignite towards their suitability as adsorbents as well as their influences on anaerobic digestion. The experiments are conducted by Sebastian Schwede (MDH) and Anna Leithäuser (RUB), who is spending a four-month research stay at the MDH in Sweden. The project is funded by the DS CCCE and a scholarship from “The foundation of dentist Gustav Dahls memory”.
Within the framework of the SFB/TRR 129 Oxyflame, we performed a systematic comparison of models for micropore analysis of biomasses using CO2 adsorption and published it in Energy & Fuels (https://doi.org/10.1021/acs.energyfuels.1c00280). The results of the Dubinin-Astakhov (DA) and Dubinin-Radushkevich (DR) models were compared with the non-local density functional theory (NLDFT). By using the following share link, the publication can be downloaded free of charge (limited to 50 accesses): https://pubs.acs.org/articlesonrequest/AOR-FEAR9YA2HNUZ2JH76VQC
As a partner of the Fraunhofer High-Performance Center DYNAFLEX and member of the ACT ELEGANCY project, we have developed new equations of state for hydrogen-rich mixtures in cooperation with the National Institute of Standards and Technology (Boulder, USA), which have been recently published in the Journal of Physical and Chemical Reference Data: https://doi.org/10.1063/5.0040533
The mixture models for the binary systems H2+CH4, H2+N2, H2+CO, and H2+CO2 are formulated in terms of the Helmholtz energy and allow for accurate calculations of the thermodynamic properties of hydrogen-rich natural gas mixtures.
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