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Article Dans Une Revue Experiments in Fluids Année : 2016

Design and testing of temperature tunable de Laval nozzles for applications in gas‑phase reaction kinetics

Résumé

A series of three de Laval nozzles initiallydesigned to generate uniform supersonic flows in heliumat 23 and 36 K and in argon at 50 K have been used witheither pure nitrogen or mixtures of nitrogen with heliumor argon in order to make a sequence of pulsed supersonicflows working at different temperatures. For this, acomputer homemade program has been used to design deLaval nozzles contours for gas mixtures in order to determinethe theoretical pressure P and temperature T in thesesupersonic flows. Spatial evolution of T along the flow axisdownstream of the nozzle exit has been characterized witha fast response Pitot tube instrument newly developed.Twenty-eight different gas mixture conditions have beentested, indicating a very good agreement with the correspondingcalculated flow conditions. The length of uniformityΔL of the supersonic flows have been found to be>30 cm in more than 80 % of the situations and >50 cmfor more than 50 % of the tested conditions. Fine temperaturetunability was achieved in the range 22–107 K withvery small fluctuations of the mean temperature along ΔL.Advantages and limits of these new developments for studiesof gas-phase reaction kinetics are discussed.

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Dates et versions

hal-01362472 , version 1 (08-09-2016)

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André Canosa, Antonio Ocaña, Maria Antinolo, Bernabé Ballesteros, Elena Jiménez, et al.. Design and testing of temperature tunable de Laval nozzles for applications in gas‑phase reaction kinetics. Experiments in Fluids, 2016, 57 (9), pp.152. ⟨10.1007/s00348-016-2238-1⟩. ⟨hal-01362472⟩
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