Measurements of Temperature and OH Radical Distributions in Flame Hydrolysis Deposition Process

Title & Authors
Measurements of Temperature and OH Radical Distributions in Flame Hydrolysis Deposition Process
Hwang, Jun-Yeong; Gil, Yong-Seok; Kim, Jeong-Ik; Choe, Man-Su; Jeong, Seok-Ho;

Abstract
The effects of SiCl$\small{_4}$addition on flame structures have been studied in flame hydrolysis deposition (FHD) processes using Coherent anti-Stokes Raman spectroscopy (CARS) and planar laser induced fluorescence (PLIF) to measure temperatures and OH concentrations, respectively. The results demonstrate that even a small amount of SiCl$\small{_4}$ addition can change thermal and chemical structures of H$\small{_2}$/O$\small{_2}$ diffusion flames. When SiCl$\small{_4}$ is added to a flame temperature decreases in non-reacting zone due to the increases in both specific heat and density of the gas mixture, while flame temperature increase in particle formation zone due to the heat release through hydrolysis and oxidation reactions of SiCl$\small{_4}$. It is also found that OH concentration decreases dramatically in particle formation zone where temperatures increase. This can be attributed to consumption of oxidative species and generation of HCl during silica formation.
Keywords
Coherent Anti-Stokes Raman Spectroscopy (CARS);Planar Laser Induced;Flame Hydrolysis Deposition;Coflow Diffusion Flames;
Language
Korean
Cited by
References
1.
Kawachi, M., Yasu, M., and Edahiro, T., 1983, 'Fabrication of \$SiO{_2}\$ - \$Tio{_2}\$ Glass Planar Optical Waveguides by Flame Hydrolysis Deposition,' Electronics Letters, Vol. 19, No. 15, pp. 583-584

2.
Chung, S. L. and Katz, J. L., 1985, 'The Counterflow Diffusion Flame Burner: A New Tool for the Study of the Nucleation of Refractory Compounds,' Combustion and Flame, Vol. 61, pp. 271-284

3.
Zachariah, M. R., Chin, D., Semerjian, H. G. and Katz, J. L., 1989, 'Dynamic Light Scattering and Angular Dissymmetry for the In Situ Measurement of Silicon Dioxide Particle Synthesis in Flames,' Applied Optics, Vol. 28, No. 3, pp. 530-536

4.
Choi, M., Cho, J., Lee, J. and Kim, H. W., 1999, 'Measurements of Silica Aggregate Particle Growth Using Light Scattering and Thermophoretic Sampling in a Growth Diffusion Flame,' Journal of Nanoparticle Research, Vol. 1, pp. 169-183

5.
Mcenally, C. S., Koylu, U. O., Pfefferle, L. D. and Rosner, D. E., 1997, 'Soot Volume Fraction and Temperature Measurements in Laminar Nonpremixed Flames Using Thermocouples,' Combustion and Flame, Vol. 109, pp. 701-720

6.
Allendorf, M. D., Bautista, J. R., and Potkay, E., 1989, 'Temperature Measurements in a Vapor Axial Deposition Flame by Spontaneous Raman Spectroscopy,' Journal of Applied Physics, Vol. 66, No. 1, pp. 5046-5051

7.
Park, S. N., Park, C. W., Hahn, J. W., Gil, Y. S. and Chung, S. H., 1996, 'Precision and Accuracy of CARS Spectrometer for Instantaneous Temperature Measurement,' Journal of Optical Society of Korea, Vol. 7, No. 4, pp. 348-356

8.
Alden, M., Edner, H., Hdmstedt, G., Svanberg, S., and Hoegberg, T., 1982, 'Single-Pulse Laser-Induced OH Fluorescence in an Atmospheric Flame Spatially Resolved with a Diode Array Director,' Applied Optics, Vol. 21, pp. 1236-1240

9.
Long, M .B., Webber, B. F., and Chang, R. K., 1979, 'Instantaneous Two-Dimensional Concentration Measurements in a Jet Flow by Mie Scattering,' Applied Physics Letters, Vol. 34, pp. 22-24

10.
Lee, S. R. and Chung, S. H., 1994, 'On the Structure of Hydrogen Diffusion Flames with Reduced Kinetic Mechanisms,' Combustion Science and Technology, Vol. 96, pp. 247-277

11.
Ho, W., Yu, Q.-R., and Bozzelli, J. W., 1992, Kinetic Study on Pyrolysis and Oxiadtion of CH3CI in Ar/H2/O2 Mixtures,' Combustion Science and Technology, Vol. 85, pp. 23-63