Gasdynamics of very small Laval nozzles
Abstract
An investigation of diverging supersonic nozzles with throat diameters in the range of 0.025 to 0.25 mm has been carried out using gasdynamic measurements for a variety of gases and mixtures with sulfur hexafluoride. Due to the small nozzle size, boundary layers, although thin, may constitute a major fraction of the flow or, indeed at low pressures, may be fully developed. Nevertheless these nozzles have been shown to be very efficient for production of clusters condensed from the expanding gas. They produce orders of magnitude increases in molecular beam intensities, relative to the conventional, isentropic free jet sources. The effects of gas properties and nozzle design on performance have been analyzed and compared to theoretical solutions to the governing equations of motion including cluster nucleation and growth.
- Publication:
-
Interim Report Northwestern Univ
- Pub Date:
- April 1981
- Bibcode:
- 1981nwu..rept.....A
- Keywords:
-
- Agglomeration;
- Gas Dynamics;
- Nozzle Design;
- Supersonic Nozzles;
- Clumps;
- Mathematical Models;
- Molecular Beams;
- Nucleation;
- Fluid Mechanics and Heat Transfer