Untitled

Bolobov, V. I.

doi:10.1023/a:1017523922778

Cited by 18 publications

(6 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The influence of the interface between solid and liquid iron is analytically studied to have an idea of how it can affect the temperature distribution of the thermal lance, but it has been excluded from the full model for simplification purposes, since the ignition temperature of iron of 1588 K at a 1 atm oxygen pressure 23 is below its melting temperature of 1811 K. As long as sufficient oxygen is available, it is expected that the iron will react as soon as it melts. The ignition temperature versus the oxygen pressure was studied by Bolobov et al 24 They performed combustion experiments with iron and steel rods of 1.5 and 3 mm and at oxygen pressures between 0.2 and 50 MPa, and they concluded that, at least for their experimental range of pressures, the ignition temperature did not have a strong dependence on the oxygen pressure. The ignition temperatures were measured by a contact method, and they were between 1523 and 1613 K.…”

Section: Thermal Lance Modelmentioning

confidence: 99%

Numerical Model for the Combustion of a Thermal Lance

Martí-Rosselló

Ray²,

et al. 2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

A mathematical model for the operation of a thermal lance is developed and validated, with the focus on its heat transfer and kinetics behavior. It has been found that there is a “window” of combustion rates in which the thermal lance can operate, which is mainly dictated by the oxygen partial pressure. The particular value of the combustion rate can be set by adjusting the flow rate of the oxygen supply, which is practically done by manipulating the oxygen supply pressure. An open issue is the lack of experimental kinetics data for thermal lance combustion.

show abstract

Section: Thermal Lance Modelmentioning

confidence: 99%

Numerical Model for the Combustion of a Thermal Lance

Martí-Rosselló

Ray²,

et al. 2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…(i) A torch located on top of the plate raises the steel to its ignition temperature (∼ 960°C [7]). For this, the torch creates a flame using a mixture of oxygen and a fuel gas, commonly acetylene, butane or propane.…”

Section: Heat Sourcementioning

confidence: 99%

“…There are two time constants τ l and τ a in equations (5) and (6) to adjust the transformation kinetics. The necessary initial conditions for liquid and austenite are stated in (7). Figure 4 shows the evolution of phase volume fractions obtained after solving (5)-(7) with a temperature history θ (t) from flame cutting.…”

Section: Phase Transitionsmentioning

confidence: 99%

“…From now on, for notation purposes, we will denote the variable ξ as x and drop the t dependency. It has to be noticed that the previous initial conditions from (7) are substituted by boundary conditions. Equation 15is a Dirichlet condition indicating that there is no volume fraction of liquid or austenite in the in-flow plane, far from the heat source.…”

Section: Phase Transitionsmentioning

confidence: 99%

See 1 more Smart Citation

Modelling and simulation of flame cutting for steel plates with solid phases and melting

et al. 2020

View full text Add to dashboard Cite

The goal of this work is to describe in detail a quasi-stationary state model which can be used to deeply understand the distribution of the heat in a steel plate and the changes in the solid phases of the steel and into liquid phase during the flame cutting process. We use a 3D-model similar to previous works from Thiébaud (J. Mater. Process. Technol. 214(2):304-310, 2014) and expand it to consider phases changes, in particular, austenite formation and melting of material. Experimental data is used to validate the model and study its capabilities. Parameters defining the shape of the volumetric heat source and the power density are calibrated to achieve good agreement with temperature measurements. Similarities and differences with other models from literature are discussed.

show abstract

“…The situation changes dramatically as the oxide layer transits into the liquid state [12][13][14]. In this case, the oxide layer is usually said to lose its protective properties.…”

Section: Iron Oxidation In An Oxygen Flowmentioning

confidence: 99%

Simulation of surface profile formation in oxygen laser cutting of mild steel due to combustion cycles

Ermolaev¹,

Ковалев²

2009

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

A physicomathematical model of cyclic iron combustion in an oxygen flow during oxygen laser cutting of metal sheets is developed. The combustion front is set into motion by focused laser radiation and a heterogeneous oxidation reaction in oxygen. The burning rate is limited by oxygen supply from the gas phase towards the metal surface, and the interface motion depends on the local temperature. A 3D numerical simulation predicts wavy structures on the metal surface; their linear sizes depend on the scanning speed of the laser beam, the thickness of the produced liquid oxide film and the parameters of the oxygen jet flow. Simulation results help in understanding the mechanism of striation formation during oxygen gas-laser cutting of mild steel and are in qualitative agreement with experimental findings.

show abstract

Untitled

Cited by 18 publications

References 8 publications

Numerical Model for the Combustion of a Thermal Lance

Numerical Model for the Combustion of a Thermal Lance

Modelling and simulation of flame cutting for steel plates with solid phases and melting

Simulation of surface profile formation in oxygen laser cutting of mild steel due to combustion cycles

Contact Info

Product

Resources

About