On the importance of non-equilibrium models for describing the coupling of heat and mass transfer at high pressure

Lamanna, Grazia; Steinhausen, Christoph; Preusche, Andreas; Bork, B.; Dreizler, Andreas; Stierle, Rolf; Groß, Joachim

doi:10.1016/j.icheatmasstransfer.2018.07.012

Cited by 25 publications

(25 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The latter have received increased attention in the past decade, as the recently published literature shows (Falgout et al 2016;Müller et al 2016;Baab et al 2016Baab et al , 2018Crua et al 2017). Since the main objectives are evaporation and disintegration processes of liquid fluids at pressures and temperatures either close to or exceeding their critical points, quantitative data for validation of numerical simulations have recently become a research concern with increasing interest (Bork et al 2017;Lamanna et al 2018;Steinhausen et al 2019;Stierle et al 2020;Nomura et al 2020;Lamanna et al 2020;Qiao et al 2020). Microscopic investigations by Santoro and Gorelli (2008), Simeoni et al (2010) as well as Bencivenga et al (2009) made it possible to distinguish various regions above the critical pressure, as is depicted in Fig.…”

Section: Introductionmentioning

confidence: 99%

On the potential and challenges of laser-induced thermal acoustics for experimental investigation of macroscopic fluid phenomena

et al. 2020

Self Cite

View full text Add to dashboard Cite

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. Graphic Abstract

show abstract

Section: Introductionmentioning

confidence: 99%

On the potential and challenges of laser-induced thermal acoustics for experimental investigation of macroscopic fluid phenomena

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…The focus of SP-B2 [20,21] is on dynamics of single droplets at near critical conditions, see also Lamanna et al in this volume. Figure 8 exemplarily shows the mixture fraction of n-hexane in the wake of an evaporating droplet and gas temperatures assuming adiabatic mixing [2].…”

Section: Transcritical Evaporation and Mixing Processesmentioning

confidence: 99%

Collaborative Research on Droplet Dynamics Under Extreme Ambient Conditions

Schulte

Dreizler

Munz

et al. 2022

Fluid Mechanics and Its Applications

Self Cite

View full text Add to dashboard Cite

A fundamental understanding of droplet dynamics is important for the prediction and optimization of technical systems involving drops and sprays. The Collaborative Research Center (CRC) SFB-TRR 75 was established in January 2010 to focus on the dynamics of basic drop processes, and in particular on processes involving extreme ambient conditions, for example near thermodynamic critical conditions, at very low temperatures, under the influence of strong electric fields, or in situations involving extreme gradients of the boundary conditions. The goal of the CRC was to gain a profound physical understanding of the essential processes, which is the basis for new analytical and numerical descriptions as well as for improved predictive capabilities. This joint initiative involved scientists at the University of Stuttgart, the TU Darmstadt, the TU Berlin, and the German Aerospace Center (DLR) in Lampoldshausen. This first chapter provides a brief overview of the overall structure of this CRC as well as a summary of some selected scientific achievements of the subprojects involved. For further details the reader is referred to the subsequent chapters of this book related to the individual subprojects.

show abstract

“…Figure 11 schematically shows the different high-pressure disintegration regimes that were obtained by varying the injection temperature across the critical temperature of the fuel (i.e., 0.8 < T inj /T c < 1.2). As can be seen, the jet morphology varies drastically across the disintegration regimes and requires the development of accurate thermodynamic models capable of describing both non-equilibrium phase transitions and multi-component mixing processes in dense gases [28].…”

Section: Dynamic Processes In Trans-critical Jetsmentioning

confidence: 99%

Collaborative Research for Future Space Transportation Systems

Haidn

Adams

Radespiel

et al. 2020

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

Self Cite

View full text Add to dashboard Cite

This chapter book summarizes the major achievements of the five topical focus areas, Structural Cooling, Aft-Body Flows, Combustion Chamber, Thrust Nozzle, and Thrust-Chamber Assembly of the Collaborative Research Center (Sonderforschungsbereich) Transregio 40. Obviously, only sample highlights of each of the more than twenty individual projects can be given here and thus the interested reader is invited to read their reports which again are only a summary of the entire achievements and much more information can be found in the referenced publications. The structural cooling focus area included results from experimental as well as numerical research on transpiration cooling of thrust chamber structures as well as film cooling supersonic nozzles. The topics of the aft-body flow group reached from studies of classical flow separation to interaction of rocket plumes with nozzle structures for sub-, trans-, and supersonic conditions both experimentally and numerically. Combustion instabilities, boundary layer heat transfer, injection, mixing and combustion under real gas conditions and in particular the investigation of the impact of trans-critical conditions on propellant jet disintegration and the behavior under trans-critical conditions were the subjects dealt with in the combustion chamber focus area. The thrust nozzle group worked on thermal barrier coatings and life prediction methods, investigated cooling channel flows and paid special attention to the clarification and description of fluid-structure-interaction phenomena I nozzle flows. The main emphasis of the focal area thrust-chamber assembly was combustion and heat transfer investigated in various model combustors, on dual-bell nozzle phenomena and on the definition and design of three demonstrations for which the individual projects have contributed according to their research field.

show abstract

On the importance of non-equilibrium models for describing the coupling of heat and mass transfer at high pressure

Cited by 25 publications

References 30 publications

On the potential and challenges of laser-induced thermal acoustics for experimental investigation of macroscopic fluid phenomena

On the potential and challenges of laser-induced thermal acoustics for experimental investigation of macroscopic fluid phenomena

Collaborative Research on Droplet Dynamics Under Extreme Ambient Conditions

Collaborative Research for Future Space Transportation Systems

Contact Info

Product

Resources

About