Heat and momentum transfer in laser induced decomposition of silane jets: theory and experiments

Date

1988-11

Author

Akmandor, İbrahim Sinan
Szekely, J.
Haggerty, John S.

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

151
views

0
downloads

Silicon powders are obtained by laser pyrolysis of silane gas. Temperature and velocity profiles are determined both theoretically and experimentally. The velocimetry consists of a marker technique which measures the propagation time of a perturbation front through the hot reaction zone. In the theoretical model, the coaxial jet expansion undergoing a thermal heating is studied by defining a Dorodnitzin-Illingworth transformation. The results show a decrease of axial velocity as the gas enters the laser heated region. The change is sharper for higher inlet velocities. In this region, the gradients of the axial temperature profiles are high.

Subject Keywords

Mechanical engineering, Condensed matter physics, Fluid flow and transfer processes

URI

https://hdl.handle.net/11511/52028

Journal

International Journal of Heat and Mass Transfer

DOI

https://doi.org/10.1016/0017-9310(88)90156-1

Collections

Department of Aerospace Engineering, Article

Suggestions

OpenMETU
Core

The dissolution of ilmenite in HClH2O, HClCH3OH and HClC2H5OH systems — A theoretical approach Türker, Lemi; Goodall, David; Girgin, İsmail (Elsevier BV, 1988-11) Silicon powders are obtained by laser pyrolysis of silane gas. Temperature and velocity profiles are determined both theoretically and experimentally. The velocimetry consists of a marker technique which measures the propagation time of a perturbation front through the hot reaction zone. In the theoretical model, the coaxial jet expansion undergoing a thermal heating is studied by defining a Dorodnitzin-Illingworth transformation. The results show a decrease of axial velocity as the gas enters the laser hea...
A hydrodynamic model developed for the condensate flowing over a sinusoidal fluted tube Gökçe, Hüseyin; Özgen, Canan (Elsevier BV, 1987-9) Fluted tubes which were designed by Gregorig considering the use of surface tension forces are commonly used in evaporators and condensers for desalination purposes. In this study the surface profile of a fluted tube, which cannot be described by any conventional coordinate system is obtained numerically by using an intrinsic-coordinate system. Navier-Stokes equations are solved after some simplifications for the condensate flowing over the sinusoidal fluted profile to find the volumetric flow rate. The res...
Modeling of particle-resin suspension impregnation in compression resin transfer molding of particle-filled, continuous fiber reinforced composites Sas, Hatice Sinem; Erdal Erdoğmuş, Merve (Springer Science and Business Media LLC, 2014-03-01) A particle-resin suspension impregnation model is used for analyzing the mold filling process in compression resin transfer molding (CRTM) of particle-filled, continuous fiber composites. The model is based on Darcy flow coupled with particle filtration and is applicable to two-dimensional impregnation through isotropic/anisotropic fiber preforms. Comparisons with simple analytical solutions and experimental results from the literature were made to validate the numerical solution. Simulations showed that CR...
Trapping parameters of repulsive centers in SbSI single crystals Ozdemir, S; Firat, T; Mamedov, AM (Elsevier BV, 2004-06-08) Charge trapping centers in antimony sulphide iodide (SbSI) single crystals have been investigated by the use of thermally stimulated current (TSC) technique. The TSC spectrum consists of only one apparent peak which is found to be associated with a single trapping level. Those traps are experimentally found to obey the monomolecular kinetics. The trapping parameters as the energy depth, temperature dependent frequency factor and capture cross section together with the concentrations of the corresponding dis...
Experimental Thermal Performance Characterization of Flat Grooved Heat Pipes Alijani, Hossein; ÇETİN, BARBAROS; Akkus, Yigit; Dursunkaya, Zafer (Informa UK Limited, 2019-06-15) The thermal characterization of aluminum flat grooved heat pipes is performed experimentally for different groove dimensions. Three heat pipes with groove widths of 0.2 mm, 0.4 mm, and 1.5 mm are used in the experiments. The effect of the amount of the working fluid is extensively studied for each groove width. The results reveal that, although all three succeed in dissipating the heat input through the phase change of the working fluid by continuous evaporation and condensation, the effectiveness of the he...

Citation Formats

İ. S. Akmandor, J. Szekely, and J. S. Haggerty, “Heat and momentum transfer in laser induced decomposition of silane jets: theory and experiments,” International Journal of Heat and Mass Transfer, pp. 2239–2249, 1988, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/52028.