Effect of initial pressure on the lower explosion limit of nicotinic acid/acetone mixture |
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| Institution: | 1. Institute for Research on Combustion-CNR, P.le Tecchio 80, 80125 Naples, Italy;2. DICMAPI, University of Naples Federico II, P.le Tecchio 80, 80125 Naples, Italy;1. Research Institute on Combustion-CNR, P.le Tecchio 80, 80125 Naples, Italy;2. DICMAPI, University of Naples Federico II, P.le Tecchio 80, 80125 Naples, Italy;1. Institute for Researches on Combustion – CNR, P.le Tecchio 80, 80125 Naples, Italy;2. Department of Chemical, Materials and Industrial Processes Engineering (DICMAPI) – University of Naples Federico II, P.le Tecchio 80, 80125 Naples, Italy;1. Istituto di Ricerche sulla Combustione - Consiglio Nazionale delle Ricerche (IRC-CNR), Piazzale V. Tecchio 80, 80125, Napoli, Italy;2. Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, Piazzale V. Tecchio 80, 80125, Napoli, Italy;1. Istituto di Ricerche sulla Combustione, CNR, Via Diocleziano 328, 80124 Napoli, Italy;2. Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, Piazzale Tecchio 80, 80125 Napoli, Italy |
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| Abstract: | In the work presented in this paper, the effect of initial pressure on the lower explosion limit (LEL) of the hybrid nicotinic acid/acetone mixture was investigated through standard explosion tests carried out in the 20 L sphere. From experimental results, the flammability diagram was built in the plane (concentration/minimum explosive concentration) of nicotinic acid versus (concentration/LEL) of acetone. Interestingly, it has been found that, in going from low pressures (P < 1 atm) to high pressures (P > 1 atm), the extension of the flammability region increases. This behavior has been attributed to the fact that the turbulence kinetic energy (and thus the energy dissipation) decreases with increasing initial pressure. Bartknecht's correlation for LEL of hybrid mixtures was modified to take into account the effect of pressure, and two correlations were obtained able to give satisfactory predictions of experimental data at both low pressures and high pressures. |
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| Keywords: | Hybrid (dust/gas-vapor) mixtures Explosion Lower explosion limit (LEL) Initial pressure 20 L sphere |
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