Dynamic Responses of Supercritical Fluids

Nyhet

Experimental Investigations on Non-Linear Effects Across the Widom Region and Near-Critical Phase Transitions

Häftad, Engelska, 2026

AvGrazia Lamanna,Christoph Steinhausen,Valerie Mrotzek

2 529 kr

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Dynamic Responses of Supercritical Fluids: Experimental Investigations on Non-Linear Effects Across the Widom Region and Near-Critical Phase Transitions provides comprehensive information on the experimental techniques that can be used to measure the dynamic responses of near-to supercritical fluids, as well as an overview of the related physical phenomena involved. At the transition from liquid or gaseous fluid states into the supercritical regime, the macroscopic fluid response functions experience maxima, which results in a non-linear coupling between small perturbations in pressure and temperature and compressible flow dynamics. This leads to anomalous fluid phenomena, such as heat transfer deterioration and thermo-convective instabilities. Instead, the transition from supercritical to near-critical states is strongly dependent on the entry point into the two-phase dome. Moreover, it requires improved modelling of non-equilibrium phase transitions.
By applying laser-induced thermal acoustics, also known as laser-induced (transient) grating spectroscopy, the fluid response to an acoustic, pressure, and thermal perturbation can be investigated. Specifically, speed of sound, thermal diffusivities, and acoustic damping rates, are measured. By applying a thermodynamic model, the latter are used to determine volume viscosities at near- to supercritical fluid states. By applying polarised Mie scattering, insights on the type of phase transitions can be inferred together with quantitative data on the average size, and droplet size distribution can be obtained.
Dynamic Responses of Supercritical Fluids: Experimental Investigations on Non-Linear Effects Across the Widom Region and Near-Critical Phase Transitions is written for applied physicists, engineers, graduate and doctoral students in chemical engineering, process engineering, and aerospace engineering.

Includes clearly presented experimental and theoretical methods for understanding dynamic processes under supercritical conditions and the outcomes that result, allowing better characterization of the microscopic states of supercritical fluids
Gives the reader physical understanding of the supercritical fluid responses and the related anomalous fluid phenomena, such as pseudo-boiling and thermo-convective instabilities
Introduces measurement techniques including laser-induced thermal acoustics (LITA), polarized Mie scattering and applying structured laser illuminated planar imaging (SLIPI) at high pressure conditions
Looks at the experimental values of acoustic attenuation, speed of sound and thermal conductivities at the transition from near- to supercritical fluid conditions
Includes Macroscopic investigations in the Widom line region and the fluid transitions across the Widom line

Produktinformation

Utgivningsdatum2026-09-01
Mått191 x 235 x undefined mm
FormatHäftad
SpråkEngelska
SerieSupercritical Fluid Science and Technology
Antal sidor352
FörlagElsevier Science
ISBN9780443136375

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Grazia Lamanna is currently a Senior Lecturer in aerospace thermodynamics and fluid dynamics at the University of Stuttgart in the Faculty of Aerospace Engineering and Geodesy. She received her M.Sc. degrees from the University of Napoli “Federico II in 1994 (Summa cum Laude) and holds a Ph.D. degree in applied physics (2000) from the Eindhoven University of Technology (TU/e) in the Netherlands. She was a research fellow at the Faculty of Chemical Engineering, University of Groningen (NL) in 1995. Her current research focuses on understanding the complex interplay between fluid dynamic and non-equilibrium thermodynamic processes in high-pressure fluids. She studies the fundamentals of these processes (e.g., non-equilibrium phase transitions, mixing, relaxation processes) that are relevant for applications in propulsion (liquid rocket and internal combustion engines) and in energy conversion systems (e.g., supercritical CO2 power plants). Specifically, she develops advanced diagnostic methods to investigate: 1) fluid injection at supercritical and transcritical conditions; 2) non-equilibrium condensation and evaporation processes at high-pressure; 3) the damping of density/temperature fluctuations by relaxation processes in the supercritical region to obtain information on the dynamic response of supercritical fluids. These investigations are important to formulate improved closure relations for the modelling of transport processes in fluid dynamic applications. Christoph Steinhausen is currently a Junior Researcher in aerospace thermodynamics and fluid dynamics at the University of Stuttgart in the Faculty of Aerospace Engineering and Geodesy. He received his M.Sc. degrees in Mechanical- and Process Engineering from the Technical University of Darmstadt in 2015. Since 2015 he is working on his Ph.D. degree in aerospace engineering at the Institute of Aerospace Thermodynamics of the University of Stuttgart. His Ph.D. thesis has been accepted earlier this year and will be defended later this year. His current research focuses on experimental investigations regarding the understanding of the complex interplay between fluid dynamic and non-equilibrium thermodynamic processes at high-pressure and high-temperature conditions. He applies laser-induced thermal acoustics and other experimental techniques to study the fundamentals of processes, such as non-equilibrium phase transitions, mixing as well as relaxation processes. These processes are relevant for propulsion and energy conversion applications. Specifically, he develops and applies advanced diagnostic methods to investigate: 1) fluid injection at supercritical and transcritical conditions; 2) evaporation processes at high-pressure conditions; 3) the damping of density/temperature fluctuations by relaxation processes in the supercritical region to obtain information on the dynamic response of supercritical fluids. These investigations are important to formulate improved closure relations for the modelling of transport processes in fluid dynamic applications.

Metadata Key Terms, Definitions 1. Introduction 2. Review On Thermodynamics Of Supercritical Fluids 3. Experimental Facility For Laser-Induced Thermal Acoustics Investigations 4. Laser-Induced Thermal Acoustics 5. Experimental Facility For Polarised Mie Scattering Investigations 6. Polarised Mie Scattering By Applying Structured Laser Illuminated Planar Imaging At High Pressure Conditions 7. Fluid Dynamic Response Across The Widom Region 8. Examples Of Near-Critical Phase Transitions 9. Conclusion