Accession Number : ADA034402


Title :   On the Growth of Steam Droplets Formed in a Laval Nozzle Using both Static Pressure and Light Scattering Measurements


Descriptive Note : Technical rept.


Corporate Author : NORTHWESTERN UNIV EVANSTON IL DEPT OF MECHANICAL ENGINEERING AND ASTRONAUTICAL SCIENCES


Personal Author(s) : Moses, Clifford A ; Stein, Gilbert D


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA034402


Report Date : Jan 1977


Pagination or Media Count : 46


Abstract : A series of experiments on steam condensation have been made in a Laval nozzle over a variety of starting conditions such that the onset of condensation occurs in the range -40 to 40 C. The homogeneous nucleation and growth of the new phase is documented with both static pressure and laser light scattering. Since even at onset the majority of the condensed phase is due to droplet growth the nucleation and growth are coupled and the availability of two measured quantities is helpful in comparing a particular combination of nucleation rate and growth law. For detailed calculations on one of the experiments there is excellent agreement with both measurements throughout the condensation zone and a theoretical calculation using the classical nucleation rate expression due to Volmer and a droplet growth law due to Gyarmathy.


Descriptors :   *CONDENSATION , *DROPS , *LAVAL NOZZLES , *NUCLEATION , *STEAM , GROWTH(GENERAL) , LIGHT SCATTERING , MATHEMATICAL MODELS , STATIC PRESSURE , SUPERSONIC FLOW


Subject Categories : Physical Chemistry
      Jet and Gas Turbine Engines
      Rocket Engines


Distribution Statement : APPROVED FOR PUBLIC RELEASE