Methanol nucleation in a supersonic nozzle

摘要

We determined the partial pressures p_(Jmax), temperatures T_(Jmax), monomer supersaturations S_ (Jmax), and characteristic times tJ_max corresponding to the maximum nucleation rates of methanol in a supersonic nozzle. We found that T_(Jmax) increased from 202.2 K to 223.7 K as p_(Jmax) increased from 67.1 to 413.2 Pa, while the maximum nucleation rate J_(max) changed by less than a factor of 4 over the measurement range. Our nucleation rates appear reasonably consistent with measurements in other devices and are within one order of magnitude of the nucleation rates predicted by classical nucleation theory.