Updated jet flame radiation modeling with buoyancy corrections

Ekoto, Isaac; Ruggles, Adam James; Creitz, Leonard; Li, J.X.

doi:10.1016/j.ijhydene.2014.03.235

Cited by 37 publications

(23 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For a horizontal jet flame, the horizontal momentum flux per unit volume ( M 0 ) is preserved along the flame volume which is a function of initial momentum flux ( G o ) per ambient density (ρ ∞ ) while buoyancy ( g ′) of the flame is caused by the flame temperature rise along the flow . It was suggested that momentum dominates the initial jet development and as the distance increases along the flame centerline, the buoyancy forces become dominant . By using the following dimensionless number (Ʌ), we can easily determine the ratio of momentum length to buoyancy length with the changes in velocity.

normalΛ = \frac{L_{m}}{L_{b}} = \frac{{((), \frac{M_{o}}{g^{'}})}^{1 / 3}}{\frac{{(Q_{T} (x_{A} - η) g / ρ_{\infty} C_{\infty} T_{\infty})}^{2 / 5}}{{(\frac{Δ T_{f}}{T_{\infty}} g)}^{3 / 5}}}

…”

Section: Resultsmentioning

confidence: 99%

“…9,15 It was suggested that momentum dominates the initial jet development and as the distance increases along the flame centerline, the buoyancy forces become dominant. 8 By using the following dimensionless number (Ʌ), 9 we can easily determine the ratio of momentum length to buoyancy length with the changes in velocity.…”

Section: Flame Projected Heightmentioning

confidence: 99%

“…or more if the current method is adopted. 8 Thus, it is suggested to take into account the buoyancy effects, in which directly contribute to the flame deformation of projected flame length and this would give better estimation on the radiative fraction. By taking into account the buoyancy effects of jet flame, ones has to understand the transition phase of momentum to buoyancy-driven condition and it was represented by…”

mentioning

confidence: 99%

See 2 more Smart Citations

Main geometrical features of horizontal buoyant jet fire and associated radiative fraction

Aziz

Kasmani

Samsudin

et al. 2019

Process Safety Progress

View full text Add to dashboard Cite

High momentum release of jet fire can be very intense, and the released heat can be very high, depending on the source capacity. One of the key parameters in characterizing the jet fire is the radiative fraction. The previous study has correlated the radiative fraction to the source using a Froude number basis. Nevertheless, the flame mechanism and associated geometrical features gave significant effects on the global radiative heat flux to some extent. Therefore, the characterization of the main geometrical features, particularly on jet flame structures at higher momentum release conditions and its correlation with the radiative fraction, are valuable to be investigated. In this work, propane was used as fuel and released through a 9.8 mm circular nozzle with the exit velocities were set ranging between 27 and 65 m/s. It was found that the liftoff length estimation from this work is in a good agreement with the jet fire release under sub‐atmospheric pressure in a vertical orientation. Furthermore, the flame projected length and height were characterized by momentum‐driven length (L m) and buoyancy‐driven height (L b) by the dimensionless characteristics length (Ʌ). The experimental observations indicate that as the Ʌ ≥ 0.0001, the radiative fraction shows a decreasing trend.

show abstract

normalΛ = \frac{L_{m}}{L_{b}} = \frac{{((), \frac{M_{o}}{g^{'}})}^{1 / 3}}{\frac{{(Q_{T} (x_{A} - η) g / ρ_{\infty} C_{\infty} T_{\infty})}^{2 / 5}}{{(\frac{Δ T_{f}}{T_{\infty}} g)}^{3 / 5}}}

…”

Section: Resultsmentioning

confidence: 99%

Section: Flame Projected Heightmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Main geometrical features of horizontal buoyant jet fire and associated radiative fraction

Aziz

Kasmani

Samsudin

et al. 2019

Process Safety Progress

View full text Add to dashboard Cite

show abstract

“…Entrainment due to buoyancy and momentum are considered, and a local equilibrium is assumed to determine the heat release in the flame. The flame model results in predictions of the velocity, density, mixture fraction, temperature, and trajectory of flame, which can have significant curvature due to buoyancy [20].…”

Section: Flame Modelmentioning

confidence: 99%

“…Because the flame is curved in the model, this radiant energy is assumed to be distributed along the length of the flame, and a weighted multi-point source model is used to calculate the heat flux field [22]. With an appropriate choice of boundary conditions (similar to the plume model, a notional nozzle model is needed to provide an effective source for this model), the flame and heat flux model has compared well to experimental data [20].…”

Section: Flame Modelmentioning

confidence: 99%

Overview of the DOE hydrogen safety, codes and standards program, part 3: Advances in research and development to enhance the scientific basis for hydrogen regulations, codes and standards

Marchi

Hecht

Ekoto

et al. 2017

International Journal of Hydrogen Energy

Self Cite

View full text Add to dashboard Cite

Hydrogen fuels are being deployed around the world as an alternative to traditional petrol and battery technologies. As with all fuels, regulations, codes and standards are a necessary component of the safe deployment of hydrogen technologies. There has been a focused effort in the international hydrogen community to develop codes and standards based on strong scientific principles to accommodate the relatively rapid deployment of hydrogen-energy systems. The need for science-based codes and standards has revealed the need to advance our scientific understanding of hydrogen in engineering environments. This brief review describes research and development activities with emphasis on scientific advances that have aided the advancement of hydrogen regulations, codes and standards for hydrogen technologies in four key areas: (1) the physics of high-pressure hydrogen releases (called hydrogen behavior); (2) quantitative risk assessment; (3) hydrogen compatibility of materials; and (4) hydrogen fuel quality.

show abstract

New model for predicting thermal radiation from flares and high pressure jet fires for hydrogen and syngas

Miller

2017

Proc. Safety Prog.

View full text Add to dashboard Cite

Current flare and jet fire models used in the process industry are primarily based on hydrocarbon gases and have been found not to be particularly effective for low luminosity gases such as hydrogen and syngas mixtures. This article presents a new model for such gases, for low to high pressure releases in both vertical and horizontal orientations. The model, which predicts flame geometry and thermal radiation, allowing for jet momentum, buoyancy, wind and flame radiant fraction, is based on extension of established models, with the addition of several new correlations. Validation against existing published data and new previously unpublished test data collected at both pilot and full scale is presented. This article provides the complete set of equations for the model.

show abstract

Updated jet flame radiation modeling with buoyancy corrections

Cited by 37 publications

References 23 publications

Main geometrical features of horizontal buoyant jet fire and associated radiative fraction

Main geometrical features of horizontal buoyant jet fire and associated radiative fraction

Overview of the DOE hydrogen safety, codes and standards program, part 3: Advances in research and development to enhance the scientific basis for hydrogen regulations, codes and standards

New model for predicting thermal radiation from flares and high pressure jet fires for hydrogen and syngas

Contact Info

Product

Resources

About