Numerical study of a laminar hydrogen diffusion flame based on the non-premixed finite-rate chemistry model; thermal NO assessment

López-Ruiz, G.; Fernandez-Akarregi, A.R.; Díaz, Liliana; Urresti, I.; Alava, I.; Ilzarbe, Jesús María Blanco

doi:10.1016/j.ijhydene.2019.05.230

Cited by 22 publications

(6 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They found that increasing inlet velocity increased residence times, local temperatures and thus, NO x formation. The latter three studies [29][30][31] were conducted with ANSYS Fluent, and all numerical results agreed with experimental data. Feng et al [32] experimentally and numerically investigated the formation of NO x in both laminar premixed and laminar diffusion flames for a wide range of biodiesel fuels.…”

Section: Introductionsupporting

confidence: 53%

“…Kang et al [29] also utilised the GRI-MECH NO x sub-mechanism in an experimental and numerical study of NO x and CO emissions of dimethyl ether/ air jet diffusion flames. Lopez-Ruiz et al [30] assessed the thermal NO x pathway of a laminar hydrogen-diffused flame. Lee et al [31] investigated the soot and NO x emissions in laminar diffusion flames for methane, ethylene, ethane, propane, and n-butane.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical simulation of nitrogen oxides and carbon monoxide emissions of biodiesel diffusion flame

Amsal

Tran

Lee

et al. 2023

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

Biodiesel is one of the most promising fossil fuel replacements for automotive engines, furnaces, and turbines due to its sustainability, energy savings, and reduced carbon emissions. While commonly reported in engine studies, nitrogen oxides (NOx) and carbon monoxide (CO) released from combustion of biodiesel have not been studied in laminar diffusion flames. This numerical study examines the concentrations of NOx and CO emissions of the laminar biodiesel diffusion flames at different carbon flow rates and then compares its emissions with those of two liquid hydrocarbon fuel surrogates, n-heptane and iso-octane. A consistent carbon flow rate of 17.2 g/h is applied at the fuel inlet to compare the NOx and CO emissions of the three liquid fuels. The results show that biodiesel diffusion flame produces greater NOx and CO emissions with increasing carbon flow rate. At the same flow rate, n-heptane produces the greatest NO with 2.1% greater than biodiesel and 4.2% greater than iso-octane. The primary pathway for generating NO in biodiesel flame is the prompt pathway, with significant contributions from the thermal and NO2 decomposition pathways. While the NO productions in n-heptane and iso-octane flames are predominantly through the thermal pathway. It is also observed that biodiesel produces the greatest CO emission with 3.2% more than those of n-heptane and iso-octane. The oxidisation reaction of CO, CO + OH = CO2 + H primarily controls the CO mass fraction in the product for all fuels.

show abstract

Section: Introductionsupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Numerical simulation of nitrogen oxides and carbon monoxide emissions of biodiesel diffusion flame

Amsal

Tran

Lee

et al. 2023

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…On the other hand, many combustors operate in the nonpremixed mode since they ensure safer operating conditions, avoiding flashback and explosion risks [15,24,25]. However, in hydrogen flames around atmospheric pressure as in the present study, where NO x formation can be correctly described by the well known Zeldovich mechanism or thermal mechanism [26,27], the high adiabatic flame temperature of hydrogen diffusion flames (peak temperatures above 2300K in this study) can yield to high levels of NO x [28,29,30]. Therefore, the main technological challenge in the design of hydrogen burners is to maintain both a high hydrogen fuel content and acceptable levels of NO x emissions.…”

Section: Latin Charactersmentioning

confidence: 64%

Experimental and numerical study of NO formation in a domestic H2/air coaxial burner at low Reynolds number

López-Ruiz

Alava

Urresti

et al. 2021

Energy

Self Cite

View full text Add to dashboard Cite

show abstract

“…The versatility of the FEM lies in its ability to model structures with arbitrary shapes, work with complex materials, and apply various types of boundary conditions [12] where it was demonstrated that numerical methods allow accurate estimation of the thermal behavior of the walls. This method can easily adapt different sets of constitutive equations, which makes it particularly attractive for physical simulations in many fields [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Thermal Performance Assessment of Walls Made of Three Types of Sustainable Concrete Blocks by Means of FEM and Validated through an Extensive Measurement Campaign

et al. 2021

View full text Add to dashboard Cite

The thermal behavior of three different walls, made with and without by-products, is assessed by means of the Finite Element Method, aiming to evaluate its performance in terms of the sustainable construction of the blocks. Results were compared to those obtained from an experimental campaign, aiming at validation of the model. The by-products used for the blocks were “lime sludge” and “sawdust”, whose performance was compared against the traditional blocks made of concrete as a reference, aiming to demonstrate its sustainability, showing decreases of the thermal transmittance up to 10.5%. Additionally, following the same methodology, the thermal behavior of these above-mentioned blocks but now with added internal insulation made of “recycled cellulose” was assessed, showing higher decreases up to 25.5%, increasing sustainability by addressing an additional reduction in waste, so the right combination of using by-products and the insulating filler in their cavities has been revealed as a promising way of optimizing the walls, offering a relevant improvement in energy savings. Finally, when comparing the U-values of the blocks made of concrete without insulation versus those made of by-products, with insulation, improvements up to 33.3% were reached. The adaptation of the procedure through a moisture correction factor was also incorporated.

show abstract

Numerical study of a laminar hydrogen diffusion flame based on the non-premixed finite-rate chemistry model; thermal NO assessment

Cited by 22 publications

References 24 publications

Numerical simulation of nitrogen oxides and carbon monoxide emissions of biodiesel diffusion flame

Numerical simulation of nitrogen oxides and carbon monoxide emissions of biodiesel diffusion flame

Experimental and numerical study of NO formation in a domestic H2/air coaxial burner at low Reynolds number

Thermal Performance Assessment of Walls Made of Three Types of Sustainable Concrete Blocks by Means of FEM and Validated through an Extensive Measurement Campaign

Contact Info

Product

Resources

About