| http://www.w3.org/ns/prov#value | - The flow cross-section of the mixing chamber and/or the convergent section may advantageously be between 5 times and 50 times the cross-sectional area of the nozzle throat, preferably between 8 times and 30 times, especially preferably between 10 times and 25 times, on at least 70% of the distance from the particle feed to the nozzle throat.
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