Experimental determination of the droplet size and velocity distributions at the exit of the bottom discharge pipe of a liquefied propane storage tank during a sudden blowdown

Hervieu, Éric; Veneau, T.

doi:10.1016/s0950-4230(96)00030-7

Cited by 36 publications

(15 citation statements)

References 1 publication

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“…Here, the metastability refers to the phase change that drastically occurs to the liquid jet. Studies in nozzles indicate that the initiation of this phase change is possible inside the nozzle [17] and is usually pronounced in long nozzles (large L/D). For short nozzles or orifices uncertainties may exist implying that geometry might have less influence.…”

Section: Numerical Implementationmentioning

confidence: 99%

Numerical simulation of flash-boiling through sharp-edged orifices

Lyras¹,

Dembele²,

Vyazmina³

et al. 2017

Int. J. CMEM

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Flash boiling is the rapid phase change of a pressurised fluid that emerges to ambient conditions below its vapour pressure. Flashing of a flowing liquid through an orifice or a nozzle can occur either inside or outside the nozzle depending on the local pressure and geometry. Vapour generation during flashing leads to interfacial interactions that eventually influence the jet.Empirical models in the literature for simulating the inter-phase heat transfer employ many simplifying assumptions, which limits their applicability. Typical models, usually derived from cavitation, fail to describe the physics of heat and mass transfer, making them unreliable for flashing. The Homogeneous Relaxation Model (HRM) is a reliable model able to capture heat transfer under these conditions accounting for the non-equilibrium vapour generation. This approach uses a relaxation term in the transport equation for the vapour. On the basis of the generic compressible flow solver within the open source computational fluid dynamics (CFD) code OpenFOAM, the HRM has been implemented to create a dedicated new solver HRMSonicELSAFoam. An algorithm that links the standard pressure-velocity coupling algorithm to the HRM is used. In this method, a pressure equation is derived which employs the continuity equation including compressibility effects. A relaxation term has been defined such that the instantaneous quality would relax to the equilibrium value over a given timescale. Although it is possible to consider this timescale constant, it is calculated via an empirical correlation in the present study.Validations have been carried out by simulating two-phase flows through sharp-edged orifices. The relatively good agreement achieved has demonstrated that the solver accurately calculates the pressure and vapour mass fraction. This demonstrates the potential of HRMSonicELSAFoam for flash boiling simulations and predicting the properties of the subsequent flash atomisation.

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Section: Numerical Implementationmentioning

confidence: 99%

Numerical simulation of flash-boiling through sharp-edged orifices

Lyras¹,

Dembele²,

Vyazmina³

et al. 2017

Int. J. CMEM

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“…Since the intermolecular collision rate is high, it is assumed that the solvent and precursor are not spatially separated and the concentration of the precursor will be proportional to the concentration of the solvent at all locations and times. Twenty spherical simulated droplets at temperature of 323 K with diameter and velocities determined stochastically based on a log-normal distribution of typical spray (15) are injected into the reactor at each time step during the injection phase. The reactor is initially filled with stationary gas at 100Pa and 293K.…”

Section: Resultsmentioning

confidence: 99%

Liquid Droplet Evaporation in Simulations of the Flow in Pulsed-Pressure MOCVD

et al. 2009

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In this paper, a numerical model of the liquid precursor droplet flash evaporation and transport is introduced. This droplet model is coupled with the Quiet Direct Simulation (QDS) scheme to model the unsteady flow development in a Pulsed Pressure MOCVD reactor. A preliminary simulation of the PP-MOCVD process including the injection and pump down phase is conducted. The simulation results are consistent with the measured pressure change in the PP-MOCVD process.

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“…The units of the constants are consistent with the complete equation of balance of nucleation, nucleation second and first derivative and the nucleation itself. The values of these constants are the product of an empirical and numerical work of the experimental set of data available for hydrocarbons and water [6,8,11,13,[24][25][26][27][28].…”

Section: Model's Developmentmentioning

confidence: 99%

A qualitative model of flashing across an aperture with a pressure differential

Polanco¹,

Holdo̸²,

Munday³

2010

WIT Transactions on Engineering Sciences

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Many industries use materials that are stored above their atmospheric pressure boiling points (superheated liquids) which can form two-phase mixtures upon their accidental release to the environment at ambient conditions. The behaviour and the characteristics of these liquid-gas mixtures during a superheated liquid release due to the breaking of the metastable state can significantly affect the hazard zone and the mitigation steps that can be taken to minimize the release impact for the hydrocarbon industry or the quality of the combustion, or explosions inside the diesel engines. The dependence of the whole process over the initial parameter values as the pressure, the temperature and others factors, which can created, for some cases, a complete breaking of the liquid core into droplets at the same time that it is going out of container like unstable jet, or a complete one phase liquid jet, is recreated by an empirical model based on the flashing process similarity and a damped second order system. Results of this model agreed with some available experimental data.

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Experimental determination of the droplet size and velocity distributions at the exit of the bottom discharge pipe of a liquefied propane storage tank during a sudden blowdown

Cited by 36 publications

References 1 publication

Numerical simulation of flash-boiling through sharp-edged orifices

Numerical simulation of flash-boiling through sharp-edged orifices

Liquid Droplet Evaporation in Simulations of the Flow in Pulsed-Pressure MOCVD

A qualitative model of flashing across an aperture with a pressure differential

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