Supersaturation ratio for a combined Graetz problem
Many experimental effects are currently devoted to the study of nucleation: their main goals are test nucleation theories and to provide accurate measurements of nucleation rates. One of the experimental techniques frequently used is based on Laminar Aerosol Generators (LAG) in which a mixture of condensible and carrier gas enters a pipe at temperature To.The condensible gas diffuses to the cooler leads to supersturation and, consequently, nucleation-rate peaks downstream the entrance of the pipe. Our main goal is to model analytically the LAG as a combined Graetz problem for the temperature and concentration fields, to determine the minimum set of parameters that govern the LAG performance and, as a first application, to show the dependence of the previously mentioned peaks on these parameters. By doing that we will obtain a tool for the designing phase of the LAG that could prevent, for example, nucleation rates to occur beyond the pipe length or that can help in choosing an adequate set of boundary conditions and carrier gas.
Bibliographic Reference: Paper presented: 5th International Aerosol Conference, Edinburgh (GB), September 12-19th, 1998
Availability: Available from DG XIII as Paper EN 41681 ORA
Record Number: 199910307 / Last updated on: 1999-03-12
Original language: en
Available languages: en