Skip to Main Content
 

Global Search Box

 
 
 
 

Files

File List


osu1211567463.pdf (2.72 MB)

ETD Abstract Container

Abstract Header

The Freezing of Highly Sub-cooled H2O/D2O Droplets

Xiao, Ruiyang
http://rave.ohiolink.edu/etdc/view?acc_num=osu1211567463

Abstract Details

2008, Master of Science, Ohio State University, Environmental Science.
The condensation of H2O and D2O in a supersonic Laval nozzle was investigated at different stagnation condition by using Pressure Trace Measurements (PTM) and Fourier Transformation Infrared (FTIR) spectroscopy. PTM determined several key properties highly related to nucleation such as the temperature and pressure corresponding to the onset of condensation, Ton, pon as well as the temperature and pressure corresponding to the maximum nucleation rate TJmax and Jmax. Moreover, the results from PTM provide important information for the FTIR study. The FTIR spectra of D2O and H2O nanodroplets in N2 carrier gas were measured in our nozzle. The observed spectra of D2O droplets had some clear peaks, and the shapes of the spectra changed as a function of flow rates and position in the nozzle. The broad peak of D2O between 2400 cm-1 and 2600 cm-1 was due to ν1, ν3, and overtone of ν2 in the liquid phase, and its peak area was correlated to the product of the weight fraction of condensate (g) and the density of the flowing mixture (ρ), values derived from PTM. There is good correlation between the peak area and g*ρ (p<0.001). From our FTIR H2O nanodroplets study, the same trends regarding spectral changes and flow rate were observed. Moreover, the first observation of cubic ice in our supersonic nozzle was made by FTIR spectroscopy at a location x =6 cm from the throat. The peak in the spectra was located at a frequency of 3250 cm-1. This result is consistent with previous FTIR and electron diffraction scattering studies of H2O nanodroplets done by Buch (Buch V., Bauerecker S., Devlin J. P., Buck U., and Kazimirski J. K. 2004. Int. Rev. Phys. Chem. 23. 375-433) and Huang (Huang J. F. and Bartell L. S. 1995, J. Phys. Chem. 99. 3924-3931), respectively. To determine the freezing rate from liquid phase to cubic ice, however, requires further optimization of the experimental setup and more quantitative study
Barbara Wyslouzil, PhD (Advisor)
Heather Allen, PhD (Advisor)
Linda Weavers, PhD (Committee Member)
89 p.
Chemistry
sub-cooled droplets; FTIR; supersonic nozzle

Recommended Citations

Citations

  • Xiao, R. (2008). The Freezing of Highly Sub-cooled H2O/D2O Droplets [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1211567463

    APA Style (7th edition)

  • Xiao, Ruiyang. The Freezing of Highly Sub-cooled H2O/D2O Droplets. 2008. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1211567463.

    MLA Style (8th edition)

  • Xiao, Ruiyang. "The Freezing of Highly Sub-cooled H2O/D2O Droplets." Master's thesis, Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1211567463

    Chicago Manual of Style (17th edition)

osu1211567463
923
© 2008, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.