Institute for Thermo- and Fluiddynamics
A fundamental equation in the form of the Helmholtz energy for vinyl chloride has been published in the literature for the first time. The article appeared in the International Journal of Thermophysics.
Accurate thermophysical property data are important for the optimal design of production processes. This publication includes an equation of state that can reproduce the underlying experimental data within its measurement uncertainty. This work, combined with other equations from the literature, provides industry with a complete set for modeling the vinyl chloride manufacturing process.
To access the key role of sorption effects in pyrolysis and char conversion of solid biomass fuels in an oxyfuel atmosphere, a pore-structure dependent kinetic (PSK) adsorption model for the prediction of adsorption and diffusion of relevant oxyfuel agents was developed within the project oxyflame. On basis of already derived parameter sets for the adsorption of O2 and CO2, the model is validated with the measured adsorption kinetics of water vapor. The experimental investigations are performed by Dr. Horacio A. Duarte from the Texas A&M University in cooperation with Tim Eisenbach (RUB). Dr. Horacio A. Duarte is spending 5 months as a guest-researcher at the chair.
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.
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