On the potential and challenges of laser-induced thermal acoustics for experimental investigation of macroscopic fluid phenomena
| Autor: | Valerie Gerber, Andreas Dreizler, Bernhard Weigand, Grazia Lamanna, Andreas Preusche, Christoph Steinhausen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: |
Fluid Flow and Transfer Processes
Equation of state Materials science 020209 energy Acoustics Computational Mechanics General Physics and Astronomy 02 engineering and technology Grating Thermal diffusivity 01 natural sciences Signal 010305 fluids & plasmas symbols.namesake Mechanics of Materials Fourier analysis Speed of sound 0103 physical sciences Thermal 0202 electrical engineering electronic engineering information engineering symbols Mixing (physics) |
| DOI: | 10.18419/opus-13136 |
| Popis: | Mixing and evaporation processes play an important role in fluid injection and disintegration. Laser-induced thermal acoustics (LITA) also known as laser-induced grating spectroscopy (LIGS) is a promising four-wave mixing technique capable to acquire speed of sound and transport properties of fluids. Since the signal intensity scales with pressure, LITA is effective in high-pressure environments. By analysing the frequency of LITA signals using a direct Fourier analysis, speed of sound data can be directly determined using only geometrical parameters of the optical arrangement no equation of state or additional modelling is needed at this point. Furthermore, transport properties, like acoustic damping rate and thermal diffusivity, are acquired using an analytical expression for LITA signals with finite beam sizes. By combining both evaluations in one LITA signal, we can estimate mixing parameters, such as the mixture temperature and composition, using suitable models for speed of sound and the acquired transport properties. Finally, direct measurements of the acoustic damping rate can provide important insights on the physics of supercritical fluid behaviour. Deutsche Forschungsgemeinschaft Projekt DEAL |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|