Comparison of detailed soot formation models for sooty and non-sooty flames in an under-ventilated ISO room

Yuen, Anthony; Yeoh, Guan Heng; Timchenko, Victoria; Chen, Timothy Bo Yuan; Chan, Qing Nian; Wang, Cheng; Li, Darson Dezheng

doi:10.1016/j.ijheatmasstransfer.2017.08.074

Cited by 39 publications

(25 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Smoke generation is modelled base on a soot yield, which is defined as the mass of soot produced per mass of fuel. Although there are short-comings for minor chemical species predictions when considering reduced chemical kinetics, it is still effective for CO predictions with significantly improved computing efficiency [28]. Thus, for large-scale compartment fire, it is common to apply such approach to acquire an effective solution.…”

Section: Methodsmentioning

confidence: 99%

Fire Risk Assessment of Combustible Exterior Cladding Using a Collective Numerical Database

Chen

Yuen

Yeoh

et al. 2019

Fire

View full text Add to dashboard Cite

Recent high-profile building fires involving highly-combustible external cladding panels in Australia as well as Dubai, China, and the United Kingdom have created a heightened awareness by the public, government, and commercial entities to act on the risks associated with non-compliant building structures. In this paper, a database of fire events involving combustible aluminium composite panels was developed based on (i) review of relevant major fire events in Australia and other countries, and (ii) numerical simulation of the ignitability, fire spread, and toxic emissions associated with composite panels. Through the application of large-eddy-simulation (LES)-based computational fire field models, the associated risks for a standardized two-storey building with external cladding was considered in this study. A total of sixteen simulation cases with different initial sizes of the fire and different air cavity widths in the exterior cladding assembly were examined to investigate the tolerable situations and their influences. It was discovered that for most cases, with an initial fire size greater than 400 kW/m−2, the fire will spread from the first to second floor before the allowed egress time period.

show abstract

Section: Methodsmentioning

confidence: 99%

Fire Risk Assessment of Combustible Exterior Cladding Using a Collective Numerical Database

Chen

Yuen

Yeoh

et al. 2019

Fire

View full text Add to dashboard Cite

show abstract

“…Aphornratana [49] also proved that the ideal gas model could provide similar simulation results to the real gas in a steam ejector with lower operating pressure. To save computational cost and to improve simulation efficiency, the ideal gas model is selected for simulation analysis for thermal fluidic flows [50,51]. The fluid flow inside the steam ejector is governed by the compressible steady-state flow conservation equations including the mass conservation equation, the momentum conservation equation and the energy conservation equation, which can be written as follows:…”

Section: Numerical Simulation Methodsmentioning

confidence: 99%

A Steam Ejector Refrigeration System Powered by Engine Combustion Waste Heat: Part 1. Characterization of the Internal Flow Structure

et al. 2019

View full text Add to dashboard Cite

With the escalating production of automobiles, energy efficiency and environmental friendliness have always been a major concern in the automotive industry. In order to effectively lower the energy consumption of a vehicle, it is essential to develop air-conditioning systems that can make good use of combustion waste heat. Ejector refrigeration systems have become increasingly popular for this purpose due to their energy efficiency and ability to recycle waste heat. In this article, the elements affecting the performance of a typical ejector refrigeration system have been explored using both experimental and numerical approaches. For the first time, the internal flow structure was characterized by means of comprehensive numerical simulations. In essence, three major sections of the steam ejector were investigated. Two energy processes and the shock-mixing layer were defined and analyzed. The results indicated that the length of the choking zone directly affects the entertainment ratio under different primary fluid temperature. The optimum enterainment ratio was achieved with 138 °C primary fluid temperature. The shock-mixing layer was greatly affected by secondary fluid temperature. With increasing of back pressure, the normal shock gradually shifted from the diffuser towards the throat, while the shock train length remains lunchanged.

show abstract

“…The nucleation is, so far, the most complicated and least-understood process in soot formation. A generally accepted description of the phenomena is that the BSUs would polymerise and grow in size to formulate liquid-like polycyclic aromatic hydrocarbons (PAHs) precursor species with no internal structure, and subsequently transformed into solid-phase soot nuclei [2,[35][36][37][38][39], under certain flaming condition.…”

Section: Nucleationmentioning

confidence: 99%

Sensitivity Analysis of Key Parameters for Population Balance Based Soot Model for Low-Speed Diffusion Flames

et al. 2019

View full text Add to dashboard Cite

In this article, the evolution of in-flame soot species in a slow speed, buoyancy-driven diffusion flame is thoroughly studied with the implementation of the population balance approach in association with computational fluid dynamics (CFD) techniques. This model incorporates interactive fire phenomena, including combustion, radiation, turbulent mixing, and all key chemical and physical formation and destruction processes, such as particle inception, surface growth, oxidation, and aggregation. The in-house length-based Direct Quadrature Method of Moments (DQMOM) soot model is fully coupled with all essential fire sub-modelling components and it is specifically constructed for low-speed flames. Additionally, to better describe the combustion process of the parental fuel, ethylene, the strained laminar flamelet model, which considers detailed chemical reaction mechanisms, is adopted. Numerical simulation is validated against a self-conducted co-flow slot burner experimental measurement. A comprehensive assessment of the effect of adopting different nucleation laws, oxidation laws, and various fractal dimension and diffusivity values is performed. The results suggest the model employing Moss law of nucleation, modified NSC law of oxidation, and adopting a fractal dimension value of 2.0 and Schmidt number of 0.9 yields the simulation result that best agreed with experimental data.

show abstract

Comparison of detailed soot formation models for sooty and non-sooty flames in an under-ventilated ISO room

Cited by 39 publications

References 48 publications

Fire Risk Assessment of Combustible Exterior Cladding Using a Collective Numerical Database

Fire Risk Assessment of Combustible Exterior Cladding Using a Collective Numerical Database

A Steam Ejector Refrigeration System Powered by Engine Combustion Waste Heat: Part 1. Characterization of the Internal Flow Structure

Sensitivity Analysis of Key Parameters for Population Balance Based Soot Model for Low-Speed Diffusion Flames

Contact Info

Product

Resources

About