Numerical and experimental investigation of buoyant gas release: Application to hydrogen jets

Chernyavsky, Boris; Wu, Tzong‐Yuan; Péneau, Frédéric; Bénard, Pierre; Oshkai, Peter; Djilali, Ned

doi:10.1016/j.ijhydene.2010.04.130

Cited by 12 publications

(7 citation statements)

References 19 publications

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“…11. A similar trend was previously shown to be the case for axisymmetric jets [21], where the probability of hydrogen ignition outside of conventional self-similar time-averaged limits was computed through simulation. In future work, this effect should also be investigated for realistic jet configurations.…”

Section: Implications Of Jet Asymmetry On Ignition Limitssupporting

confidence: 75%

“…However, numerical simulation have also proved useful for determining ignition limits associated with hydrogen [21]. In general, one can categorize a round jet nozzle type through a flat surface as a sharp-edged orifice plate (OP), smooth contraction (SC), or a long pipe (LP).…”

Section: Introductionmentioning

confidence: 99%

“…The influence of initial conditions on turbulent mixing and combustion performance in reactive jets, has also been of active interest in the scientific community [34,35]. In last two decades, due to rapid growth in the use of hydrogen powered fuel cell vehicle, several experimental and numerical studies [21,[36][37][38] have also addressed different accidental hydrogen dispersion scenarios. It is noteworthy that all aforementioned studies, as well as related previous investigations on jets or plumes, have been limited to leaks through flat surfaces, where the direction of the jet mean flow was aligned with the flow origin.…”

Section: Introductionmentioning

confidence: 99%

“…Of these, significant advances in round jet theory have been made possible from statistical analysis of many physical experiments [5][6][7][8][9][10][11][12][13][14][15][16][17]. Advances in computational resources have also allowed numerical sim-ulation, through large eddy simulation (LES), to prove useful for determining entire flow fields of such round jets [18][19][20][21][22]. In most experiments, data has been collected for air, helium, and CO 2 jets, due to the reactive nature of hydrogen.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and numerical investigation of turbulent jets issuing through a realistic pipeline geometry: Asymmetry effects for air, helium, and hydrogen

nia

Maxwell

Oshkai

et al. 2018

International Journal of Hydrogen Energy

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Experiments and numerical simulations were conducted to investigate the dispersion of turbulent jets issuing from realistic pipe geometries. The effect of jet densities and Reynolds numbers on vertical buoyant jets were investigated, as they emerged from the side wall of a circular pipe, through a round orifice. Particle image velocimetry (PIV) and planar laser-induced fluorescence (PLIF) techniques were employed simultaneously to provide time-averaged flow velocity and concentrations fields. Large eddy simulation (LES) was applied to provide further detail with regards to the three-dimensionality of air, helium, and hydrogen jets. These realistic jets were always asymmetric and found to deflect about the vertical axis. This deflection was influenced by buoyancy, where heavier gases deflected more than lighter gases. Significant turbulent mixing was also observed in the near field. The realistic jets, therefore, experienced faster velocity decay, and asymmetric jet spreading compared to round jets. These findings indicate that conventional round jet assumptions are, to some extent, inadequate to predict gas concentration, entrainment rates and, consequently, the extent of the flammability envelope of realistic gas leaks.

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Section: Implications Of Jet Asymmetry On Ignition Limitssupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental and numerical investigation of turbulent jets issuing through a realistic pipeline geometry: Asymmetry effects for air, helium, and hydrogen

nia

Maxwell

Oshkai

et al. 2018

International Journal of Hydrogen Energy

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“…In the last two decades, due to the rapid development of the hydrogen economy and use of hydrogen technologies, several experimental and numerical studies (Chernyavsky et al 2011;Houf & Schefer 2008;Schefer et al 2008a,b;Xiao et al 2011) have investigated small-scale unintended hydrogen round jet release in ambient air, while others (Ekoto et al 2012;Houf et al 2013Houf et al , 2010Hajji et al 2015) studied different accidental hydrogen dispersion scenarios in enclosed and open spaces. There has also been extensive work done to describe the evolution of axisymmetric round turbulent jets in terms of selfsimilarity correlations, obtained from statistical analysis from both experiments (Lipari & Stansby 2011;Ball et al 2012) and simulations (M. Kaushik 2015).…”

Section: Introductionmentioning

confidence: 99%

Measurements of flow velocity and scalar concentration in turbulent multi-component jets: asymmetry and buoyancy effects

et al. 2020

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Buoyancy effects and nozzle geometry can have a significant impact on turbulent jet dispersion. This work was motivated by applications involving hydrogen. Using helium as an experimental proxy, buoyant horizontal jets issuing from a round orifice on the side wall of a circular tube were analysed experimentally using particle image velocimetry (PIV) and planar laser-induced fluorescence (PLIF) techniques simultaneously to provide instantaneous and time-averaged flow fields of velocity and concentration. Effects of buoyancy and asymmetry on the resulting flow structure were studied over a range of Reynolds numbers and gas densities. Significant differences were found between the centreline trajectory, spreading rate, and velocity decay of conventional horizontal round axisymmetric jets issuing through flat plates and the pipeline leak-representative jets considered in the present study. The realistic pipeline jets were always asymmetric and found to deflect about the jet axis in the near field. In the far field, it was found that the realistic pipeline leak geometry causes buoyancy effects to dominate much sooner than expected compared to horizontal round jets issuing through flat plates. † Email address for correspondence: majids@uvic.ca arXiv:1811.05580v1 [physics.flu-dyn]

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Experimental and computational studies of concentration and flow field variation of syngas released

Li,

Wang,

Yin

et al. 2023

Env Prog and Sustain Energy

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Syngas is an important chemical energy source with broad application prospects. The main problem with using syngas is its hazards, such as high storage pressure, high dispersion, low mass density, explosive, and toxic. The aim of this article is to find the key factors for the diffusion of syngas leakage and analyze the distribution of the dangerous concentration range from the diffusion behavior and hazard range characteristics of syngas leakage under complex working conditions. Therefore, a syngas leakage experimental bench is established, and a three‐dimensional simulation of syngas leakage was modeled. The results show that the initial pressure is the most critical factor, and the concentration distribution under different initial pressures is significantly different. The time required for carbon monoxide (CO) and hydrogen (H2) to reach their maximum concentration increased as the initial pressure or temperature decreased. The volume ratio had little effect on the time when CO and H2 reached the maximum concentration. In the horizontal direction, CO diffused further than H2 in the buoyant jet. The max volume fraction of H2 and CO did not exceed 1% and 2.5%, respectively. The research results are expected to give guidelines for the safety protection and standard improvement of syngas leakage.

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Numerical and experimental investigation of buoyant gas release: Application to hydrogen jets

Cited by 12 publications

References 19 publications

Experimental and numerical investigation of turbulent jets issuing through a realistic pipeline geometry: Asymmetry effects for air, helium, and hydrogen

Experimental and numerical investigation of turbulent jets issuing through a realistic pipeline geometry: Asymmetry effects for air, helium, and hydrogen

Measurements of flow velocity and scalar concentration in turbulent multi-component jets: asymmetry and buoyancy effects

Experimental and computational studies of concentration and flow field variation of syngas released

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