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

Abstract : A series of three de Laval nozzles initially designed to generate uniform supersonic flows in helium at 23 and 36 K and in argon at 50 K have been used with either pure nitrogen or mixtures of nitrogen with helium or argon in order to make a sequence of pulsed supersonic flows working at different temperatures. For this, a computer homemade program has been used to design de Laval nozzles contours for gas mixtures in order to determine the theoretical pressure P and temperature T in these supersonic flows. Spatial evolution of T along the flow axis downstream of the nozzle exit has been characterized with a fast response Pitot tube instrument newly developed. Twenty-eight different gas mixture conditions have been tested, indicating a very good agreement with the corresponding calculated flow conditions. The length of uniformity ΔL of the supersonic flows have been found to be >30 cm in more than 80 % of the situations and >50 cm for more than 50 % of the tested conditions. Fine temperature tunability was achieved in the range 22–107 K with very small fluctuations of the mean temperature along ΔL. Advantages and limits of these new developments for studies of gas-phase reaction kinetics are discussed.
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Submitted on : Thursday, September 8, 2016 - 6:35:28 PM
Last modification on : Wednesday, June 19, 2019 - 4:14:02 PM

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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, Springer Verlag (Germany), 2016, 57 (9), pp.152. ⟨10.1007/s00348-016-2238-1⟩. ⟨hal-01362472⟩

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