Burning rate distributions for boundary layer flow combustion of a PMMA plate in forced flow

Ananth, Ramagopal; Ndubizu, Chuka C.; Tatem, Patricia A.

doi:10.1016/s0010-2180(03)00143-3

Cited by 31 publications

(7 citation statements)

References 17 publications

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“…It is expected to be significantly different from that of a flat plate, which has been relatively well studied. Recently, Ndubizu et al [16] and Ananth et al [17] performed experiments and numerical calculations on the burning of 2.3 cm thick, 7.5 Â 9.5 cm PMMA plates under forced convection. Their results show that both the surface curvature and solid heat-up rate have significant effects on the local burning rates of PMMA.…”

Section: Resultsmentioning

confidence: 99%

Suppression and Extinguishment of Boundary Layer Flame over Communication Cable by `Gas-like' Water Mist in Cross-flow

Ndubizu

Ananth

Williams

2008

Journal of Fire Sciences

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Fire suppression experiments are performed with `gas-like' water mist in cross-flow on bare (without PVC jacket) communication cables to simulate a worst-case scenario. As fine water droplets are injected at low velocities, an initial envelope flame that engulfed the circumference of the cable recedes and forms a wake flame stabilized behind the cable. At high-mist concentration and/or high-air velocity, the flame is extinguished by shrinking rather than blowing-off, which is the case in flat plate boundary layer flames. The results show that ultra fine mist (UFM, Sauter mean droplet diameter, SMD = 3 μm) seems to be more effective in reducing the extinguishment time than high-pressure spray nozzle mist (SMD = 20 μm), which introduces spray-induced turbulence. The cable flame is extinguished rapidly after a threshold UFM concentration is exceeded. The threshold concentration decreases with increased air velocity. Finally, the copper cylindrical mesh, which is part of the cable, significantly enhances the effectiveness of UFM in flame extinguishment.

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Section: Resultsmentioning

confidence: 99%

Suppression and Extinguishment of Boundary Layer Flame over Communication Cable by `Gas-like' Water Mist in Cross-flow

Ndubizu

Ananth

Williams

2008

Journal of Fire Sciences

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“…The resulting gas phase equations are identical to the gas phase equations described by Ananth and Mowrey [11][12][13] for the specified single-step chemistry [18]. Equations ( 1)-( 17) contain specie and mixture properties and fluxes, which are described elsewhere by Ananth and Mowrey [12,13] and Ananth et al [24,25] for the gas phase. They contain the five species involved in combustion (propane, oxygen, carbon dioxide, water, and nitrogen).…”

Section: Discussionmentioning

confidence: 99%

Suppression Dynamics of a Co-flow Diffusion Flame with High Expansion Aqueous Foam

Ananth

Farley

2009

Journal of Fire Sciences

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A time-dependent, moving boundary, multiphase Navier-Stokes model is developed to study the effects of aqueous foam with high air-to-water volume ratio (expansion ratio, Ex) on a jet diffusion flame. The flame is formed by combusting a steady flow of propane gas. Both the shape and velocity of the foam surface are affected by evaporation and injection rates, and are obtained by volume of fluid method. The evaporation at the advancing foam front releases water vapor as well as a significant amount of air into the flame. At low foam injection rates, simulations show that the flame spreads along the foam surface and is not extinguished. This is because the injection rate is comparable to the evaporation rate, which causes cooling but prevents the foam from advancing into the flame. However, at high foam injection rates, the simulations show that the flame lifts from the burner lip and the flame is reestablished above the rising foam surface due to the continued supply of the propane gas. Thus, the foam extinguishes the flame locally in its path by increased smothering as it rises towards the top of the burner. Both the smothering and evaporation effects are found to be important.

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“…Many of these studies have been driven by fire modelling applications. Representative values (for example, due to Ananth et al [24] for PMMA) are as follows: [27].…”

Section: Polymer Decomposition Modellingmentioning

confidence: 99%

Polymer Combustion as a Basis for Hybrid Propulsion: A Comprehensive Review and New Numerical Approaches

et al. 2011

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Hybrid Propulsion is an attractive alternative to conventional liquid and solid rocket motors. This is an active area of research and technological developments. Potential wide application of Hybrid Engines opens the possibility for safer and more flexible space vehicle launching and manoeuvring. The present paper discusses fundamental combustion issues related to further development of Hybrid Rockets. The emphasis is made on the two aspects: (1) properties of potential polymeric fuels, and their modification, and (2) implementation of comprehensive CFD models for combustion in Hybrid Engines. Fundamentals of polymeric fuel combustion are discussed. Further, steps necessary to accurately describe their burning behaviour by means of CFD models are investigated. Final part of the paper presents results of preliminary CFD simulations of fuel burning process in Hybrid Engine using a simplified set-up. Keywords

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Burning rate distributions for boundary layer flow combustion of a PMMA plate in forced flow

Cited by 31 publications

References 17 publications

Suppression and Extinguishment of Boundary Layer Flame over Communication Cable by `Gas-like' Water Mist in Cross-flow

Suppression and Extinguishment of Boundary Layer Flame over Communication Cable by `Gas-like' Water Mist in Cross-flow

Suppression Dynamics of a Co-flow Diffusion Flame with High Expansion Aqueous Foam

Polymer Combustion as a Basis for Hybrid Propulsion: A Comprehensive Review and New Numerical Approaches

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