caa a22 4500 477093515 CHVBK 20180405111521.0 cr unu---uuuuu 170330e19961101xx s 000 0 eng 10.1007/BF00189042 doi (NATIONALLICENCE)springer-10.1007/BF00189042 An experimental study of supersonic microjets [Elektronische Daten] [S. Scroggs, G. Settles] Miniature axisymmetric supersonic nozzles were produced with exit Mach numbers ranging from 1.0 to 2.8 by forming Pyrex® capillary tubing of 0.6 and 1.2 mm inside diameter into converging-diverging channels. The nozzle contours were measured and were found to compare favorably to ideal solutions given by the axisymmetric method of characteristics. In addition, the surfaces of these nozzles were quite smooth, providing featureless flows at perfect expansion. Schlieren visualization and pitot pressure measurements of the resulting microjets were compared to the literature available for jets produced by larger-scale nozzles. A postponed transition to turbulence is noted in these microjets due to their low Reynolds number. The pitot pressure on centerline is nearly uniform at perfect expansion over core lengths up to 12 nozzle exit diameters. Supersonic microjet nozzles thus provide a more effective small-scale high-pressure gas delivery device than do sonic nozzles of comparable scale at equivalent mass flow rates. Supersonic microjets may therefore have several industrial applications. Springer-Verlag, 1996 Scroggs S. Gas Dynamics Lab Mechanical Engineering Department, The Pennsylvania State University, 16802, University Park, PA, USA aut Settles G. Gas Dynamics Lab Mechanical Engineering Department, The Pennsylvania State University, 16802, University Park, PA, USA aut Experiments in Fluids Springer-Verlag 21/6(1996-11-01), 401-409 0723-4864 21:6<401 1996 21 348 https://doi.org/10.1007/BF00189042 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00189042 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Scroggs S. Gas Dynamics Lab Mechanical Engineering Department, The Pennsylvania State University, 16802, University Park, PA, USA aut NATIONALLICENCE 700 1- Settles G. Gas Dynamics Lab Mechanical Engineering Department, The Pennsylvania State University, 16802, University Park, PA, USA aut NATIONALLICENCE 773 0- Experiments in Fluids Springer-Verlag 21/6(1996-11-01), 401-409 0723-4864 21:6<401 1996 21 348 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer