Methanol nucleation in a supersonic nozzle

We determined the partial pressures pJmax, temperatures TJmax, monomer supersaturations SJmax, and characteristic times ΔtJmax  corresponding to the maximum nucleation rates of methanol in a supersonic nozzle. We found that TJmax increased from 202.2 K to 223.7 K as pJmax increased from 67.1 to 413.2 Pa, while the maximum nucleation rate Jmax 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.