Fluid injection with supercritical reservoir conditions: Overview on morphology and mixing

Gerber, Valerie; Baab, Steffen; Förster, Felix J.; Mandler, Hannes; Lamanna, Grazia

doi:10.1016/j.supflu.2020.105097

Cited by 25 publications

(17 citation statements)

References 63 publications

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“…However, the Widom line cannot be clearly defined at high pressure and high temperature (see Figure 1(b)), where the minima of the thermal diffusivity coefficients are found to be more appropriate by Gorelli et al [12] for tracking the transition between the supercritical LL and GL fluids. In the pseudo-boiling transition, no structural change has been observed in macroscopic light scattering experiments [6,7]. As such, these phenomena share a nonlinear behavior similar to that of the subcritical condition when the coexistence line is crossed, as illustrated in Figure 1.…”

Section: Introductionmentioning

confidence: 81%

See 1 more Smart Citation

Exploring the interaction between phase separation and turbulent fluid dynamics in multi-species supercritical jets using a tabulated real-fluid model

Jafari

Gaballa

Habchi

et al. 2022

The Journal of Supercritical Fluids

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Section: Introductionmentioning

confidence: 81%

“…The properties in these states significantly deviate from the ideal gas as they introduce some thermodynamics' non-idealities and transports anomalies. Two-phase flows covering (LL) and (GL) conditions are known in the literature as the transcritical regime [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Exploring the interaction between phase separation and turbulent fluid dynamics in multi-species supercritical jets using a tabulated real-fluid model

Jafari

Gaballa

Habchi

et al. 2022

The Journal of Supercritical Fluids

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“…The transport properties at high pressures can be defined by additional models used in combination with these EOS, such as the Chung et al's model 48 for viscosity and thermal conductivity. In addition to these thermophysical properties, recent experimental research by Gerber et al 49 and numerical simulations by Foll et al 50 has revealed that the diffusive transport of mass cannot be omitted at high pressures (which corresponds to supercritical pressures of cryogenic fluids).…”

Section: Simulation Casesmentioning

confidence: 99%

Unpicking the interplay of turbulence, diffusion, and thermophysics in cryogenic jets at supercritical pressures

et al. 2021

Self Cite

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Cryogenic supercritical fluids represent an intriguing category of fluids that combine mechanical and thermophysical properties of both ultra low temperature conditions as well as phenomena taking place well above the critical point. Recent research has demonstrated that it is a common misconception to consider the supercritical state as one homogeneous state. Instead these fluids consist of two to four liquid and gas like phases, each with their own unique characteristics. In our work we investigate numerically single specie cryogenic fluid jets -initially at subcritical temperatureswhich are injected into a supercritical environment (both the pressure and temperature exceed the thermodynamic critical state). For the investigation, a new solver namely "CoolFoam" has been developed which is designed for compressible non-isothermal two-fluid simulations where diffusive transport of heat and/or mass are accounted for. Real fluid thermodynamics are modelled using a polynomial fitting approach developed in our previous work. We introduce also a new phase characterisation framework based on the association of phases with specific temperature ranges (rather than using a single line like the Widom line) which allowed us to better identify similarity effects between the various conditions. We analyse the inter-dependence of the underlying phenomena: density gradient and diffusive mass transport (molecular and thermo(Soret)-diffusion) and turbulence. We also compared supercritical N 2 with subcritical liquid and gas jets to highlight potential differences with respect to how these jets behave. We find that the jet dynamics are largely dictated by the thermodynamic transition of the injected fluid and the associated variation in thermophysical properties. Recently new evidence relevant to the behaviour of cryogenic jets has been produced based both on numerical and experimental efforts. Banuti has presented a detailed thermo-

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“…In our previous work we have explained the trends in thermophysical properties of cryogenic fluids at supercritical pressures and provided an overview of the dynamics (mechanics and thermodynamics) of cryogenic jets [2]. Although diffusive transport of mass is usually omitted in numerical simulations of sprays and jets, recent experimental [3] and numerical research [4] have concluded that diffusive transport is important at high pressures, which corresponds to supercritical pressures of cryogenic fluids. In addition, recent theoretical, experimental and molecular dynamics research has further revealed that supercritical phases cannot be considered as a single homogeneous state and in reality comprises of liquid-like and gas-like phases.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulations of cryogenic jets at supercritical pressure conditions.

Gopal

Tretola

Morgan

et al. 2021

ICLASS

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Advancements in novel high efficiency IC engines, cryogenic rocket engines and cooling technologies have given rise to the need for accurate simulation capabilities of cryogenic jets. The ability to accurately simulate cryogenic jets will be pivotal in controlling the jet penetration and/or heat absorption depending upon the role of cryogenic fluids in such systems. In this paper, we present the numerical simulations of injection of two common cryogenic fluids in transportation and energy sector, i.e. LN 2 and CH 4 injection at supercritical pressures, using the new 'coolFoam' solver developed in-house for cryogenic simulations. The solver is a VoF based compressible two-fluid solver with diffusive mass and heat transfer. Real fluid thermophysical models are utilised to estimate the drastically varying fluid properties across these conditions. This solver enables us to accurately simulate and analyse a range of underlying thermophysical mechanisms in such jets. The different case configurations include working conditions of novel RSCE and cryogenic rocket engines, where fluid is injected as liquid as well as supercritical fluid to understand the pseudoboiling effects. Additionally, multi-specie/fluid configuration corresponding to real world engine chamber conditions, provide a critical insight into the role of thermophysical mechanisms combined with the mixing dynamics.

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Fluid injection with supercritical reservoir conditions: Overview on morphology and mixing

Cited by 25 publications

References 63 publications

Exploring the interaction between phase separation and turbulent fluid dynamics in multi-species supercritical jets using a tabulated real-fluid model

Exploring the interaction between phase separation and turbulent fluid dynamics in multi-species supercritical jets using a tabulated real-fluid model

Unpicking the interplay of turbulence, diffusion, and thermophysics in cryogenic jets at supercritical pressures

Numerical simulations of cryogenic jets at supercritical pressure conditions.

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