Religião e identificação étnica

Ranzi, Serlei Maria Fischer

doi:10.15448/1980-864x.2000.1.24800

Cited by 2 publications

(10 citation statements)

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“…2. The Ranzi et al [5] mechanism gives very close agreement in magnitude with data (especially at φ=0.5), and is able to capture the roll-off and τ ign variation with φ as seen in data. The Ranzi et al [5] model slightly overpredicts the ignition delay times at φ=1 (above 980 K).…”

Section: Resultssupporting

confidence: 61%

“…n-dodecane/air τign results. τign predictions of the Ranzi et al [5] and the Zhang et al [6] mechanisms are also shown.…”

Section: Resultsmentioning

confidence: 76%

“…Sample n-dodecane/air experimental pressure and OH * emission data. Modeled pressure trace using the Ranzi et al [5] mechanism is also shown. Fig.…”

Section: Resultsmentioning

confidence: 97%

“…Ignition delay time predictions using the JP-8 mechanisms of Ranzi et al [5] and Zhang et al [6] are presented in Fig. 2.…”

Section: Resultsmentioning

confidence: 99%

“…Shock tube ignition time measurements of n-dodecane mixtures thus can provide critical validation targets for refinement of ndodecane and jet fuel surrogate kinetic mechanisms, and is the focus of this paper. We also provide comparisons with the predictions of following two detailed JP-8 (where ndodecane is used as a representative of the n-alkane fraction of jet fuels) mechanisms: Ranzi et al [5](280 species, 7800 rxns. ), and Zhang et al [6](208species, 1087 rxns.…”

Section: Introductionmentioning

confidence: 99%

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High-pressure shock tube experiments and modeling of n-dodecane/air ignition

2009

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Summary. We have measured ignition delay times of n-dodecane/air mixtures over a range of conditions including pressures of 18-31 atm, temperatures of 943-1177 K, and equivalence ratios (φ) of 0.5-1.0, utilizing the heated, high pressure shock tube (HPST) at Stanford University. The shock tube and mixing assembly were heated to 120 and 170 C, respectively, to prevent condensation of n-dodecane fuel (because of its low vapor pressure). Ignition delay times behind reflected shocks were measured using side−wall pressure and OH * emission diagnostics. Shock tube ignition time measurements can provide excellent validation targets for refinement of jet fuel kinetic modeling, and n-dodecane is widely used as the principal representative for n-alkanes in jet fuel surrogates. To the best of our knowledge, we report the first gas-phase shock tube ignition time data for n-dodecane. We also provide comparisons with the ignition delay time predictions of two detailed JP-8 mechanisms that include n-dodecane as an important JP-8 surrogate component.

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Section: Resultssupporting

confidence: 61%

“…n-dodecane/air τign results. τign predictions of the Ranzi et al [5] and the Zhang et al [6] mechanisms are also shown.…”

Section: Resultsmentioning

confidence: 76%

“…Sample n-dodecane/air experimental pressure and OH * emission data. Modeled pressure trace using the Ranzi et al [5] mechanism is also shown. Fig.…”

Section: Resultsmentioning

confidence: 97%

“…Ignition delay time predictions using the JP-8 mechanisms of Ranzi et al [5] and Zhang et al [6] are presented in Fig. 2.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High-pressure shock tube experiments and modeling of n-dodecane/air ignition

2009

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Relative Reactivity of Oxygenated Fuels: Alcohols, Aldehydes, Ketones, and Methyl Esters

et al. 2016

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This work aims at comparing and highlighting the main reaction pathways characterizing the combustion behavior of oxygenated fuels. Ethanol and heavier alcohols are already viable biofuels, despite some concern about their aldehydes and ketones emissions. Recently, the potential of 2-butanone (methyl ethyl ketone, MEK) as anti-knocking fuel was investigated at engine-relevant conditions. Moving from methyl butanoate (MB), long-chain fatty acid methyl esters are largely considered and used as biodiesels, mainly in Europe. Starting from a consistent assessment of C-H and C-C bond dissociation energies (BDEs) in n-butane, n-butanol, n-butanal, MEK, and MB, their impact on the selectivity of the different H-abstraction reactions and their relative reactivity are analyzed. Low-temperature oxidation mechanisms of 1-butanol and 2-butanone are also presented and discussed. Based on the upgraded Politecnico di Milano (POLIMI) kinetic mechanism, the relative reactivity of n-butane and the different oxygenated fuels is discussed here in depth. Stoichiometric fuel/air mixtures at 10 and 30 atm and 600-1450 K are analyzed. At low temperatures (T < 675 K), n-butanol and 2-butanone show the lowest reactivity, whereas the other fuels tend to converge to a very similar behavior. n-Butanal is the fastest to ignite in the whole T range, because it has the weakest C-H BDEs. No negative temperature coefficient (NTC) behavior is observed for n-butanal and n-butanol under the investigated conditions. A weak NTC is predicted for MB, similar to that of propane. MB and 2-butanone are the slowest to ignite between 750 and 850 K. A limited number of fuel-specific reactions characterizing each fuel and deserving more accurate investigation are highlighted, together with the lack of experimental targets below 850 K for MB and 2-butanone

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Religião e identificação étnica

Abstract: Este texto analisa os contatos inter-religiosos entre católicos e luteranos em Curitiba entre 1850-1919, a partir dos rituais de batismo, casamento e sepultamento.

Cited by 2 publications

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High-pressure shock tube experiments and modeling of n-dodecane/air ignition

High-pressure shock tube experiments and modeling of n-dodecane/air ignition

Relative Reactivity of Oxygenated Fuels: Alcohols, Aldehydes, Ketones, and Methyl Esters

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