Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Flow characterization of a diamond-depositing dc arcjet by laser-induced fluorescence

Not Accessible

Your library or personal account may give you access

Abstract

Laser-induced fluorescence (LIF) measurements of seeded nitric oxide and naturally occurring species in a diamond-depositing dc arcjet of hydrogen/argon/methane (0.8:1.0:0.005) at 25 Torr are used to determine the temperature and velocity fields in a gas jet. LIF measurements are also used to demonstrate the importance of gas recirculation on the chemical composition of the arcjet plume. The gas flow in the arcjet plume is supersonic, with a maximum axial speed of 2.6 km/s at the center of the nozzle exit. This axial velocity decreases with radius with a parabolic distribution in the plume. There is no measurable radial velocity in the free stream of the arcjet plume, and the radial expansion of the plume is consistent with diffusion. The maximum temperature at the plume center is 2400 K and varies less than 15% with chamber pressures of 10–50 Torr. The substrate is placed in the arcjet plume normally to the directed velocity, producing a stagnation point. The gas temperature above this stagnation point is observed to rise abruptly as a consequence of the supersonic shock. The radial velocity near the stagnation point becomes significant, and a maximum radial velocity of 1300 m/s is determined.

© 2000 Optical Society of America

Full Article  |  PDF Article
More Like This
Two-photon laser-induced fluorescence of atomic hydrogen in a diamond-depositing dc arcjet

Wolfgang Juchmann, Jorge Luque, and Jay B. Jeffries
Appl. Opt. 44(31) 6644-6652 (2005)

Laser-induced fluorescence temperature measurements in a dc arcjet used for diamond deposition

George A. Raiche and Jay B. Jeffries
Appl. Opt. 32(24) 4629-4635 (1993)

Absolute concentration measurements of CH radicals in a diamond-depositing dc-arcjet reactor

J. Luque, W. Juchmann, and J. B. Jeffries
Appl. Opt. 36(15) 3261-3270 (1997)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (12)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (1)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (6)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved