The Resource Investigation of low-pressure laser induced fluorescence for measuring temperature profiles in a rarefied gas, by Thomas O. Leimkuehler

Investigation of low-pressure laser induced fluorescence for measuring temperature profiles in a rarefied gas, by Thomas O. Leimkuehler

Label
Investigation of low-pressure laser induced fluorescence for measuring temperature profiles in a rarefied gas
Title
Investigation of low-pressure laser induced fluorescence for measuring temperature profiles in a rarefied gas
Statement of responsibility
by Thomas O. Leimkuehler
Title variation
Rarefied gas temperature profiles by LIF
Creator
Subject
Language
eng
Summary
In a rarefied gas, heat transfer in the transition regime (i.e., Knudsen number range of 0.1 to 10) is affected by molecular as well as gas-surface interactions. Theoretical results for the heat transfer can be obtained through computational solutions of the Boltzmann equation and appropriate intermolecular and gas-surface interaction models. As with all computational and phenomenological models, experimental verification is required. In this work, a low-pressure laser induced fluorescence (LIF) technique is investigated for measuring temperature profiles between parallel flat plates, and the results are compared to theoretical predictions. Iodine vapor is used as the gas medium due to its attractive spectral properties. Two surfaces of a closed, short cylindrical iodine cell are employed as a parallel flat plate geometry and are maintained at different temperatures. Cold and hot plate temperature combinations of (1) 20°C and 70°C, respectively, and (2) 20°C and 115°C, respectively, were used. Calibration measurements were performed at uniform temperatures of 45°C and 70°C, Solid iodine stem temperatures of 0°C and -20°C, corresponding to pressures of 30 mtorr and 3 mtorr, respectively, and Knudsen numbers of 0.05 and 0.5, respectively, were investigated. The data shows the expected trends, indicating observable temperature jumps at the surfaces and matching well with the theoretical predictions in the bulk gas. Deviations from the theory were largest near the surface, possibly a result of the limitations of the theoretical models for this particular experimental case. In addition, problems stemming from fluctuations of the chamber pressure as well as attenuation of the excitation laser beam affected collection of definitive temperature profile measurements. However, much progress with the low-pressure LIF technique has been made, and the technique continues to look promising for obtaining accurate and reliable temperature profile measurements in the transition regime
Additional physical form
Also available on the Internet.
Cataloging source
MUU
http://library.link/vocab/creatorDate
1972-
http://library.link/vocab/creatorName
Leimkuehler, Thomas O.
Degree
Ph. D.
Dissertation year
2000.
Government publication
government publication of a state province territory dependency etc
Granting institution
University of Missouri-Columbia
Illustrations
illustrations
Index
no index present
Literary form
non fiction
Nature of contents
  • bibliography
  • theses
http://library.link/vocab/subjectName
  • Rarefied gas dynamics
  • Temperature measurements
  • Heat
  • Lasers in chemistry
  • Fluorescence spectroscopy
Target audience
specialized
Label
Investigation of low-pressure laser induced fluorescence for measuring temperature profiles in a rarefied gas, by Thomas O. Leimkuehler
Instantiates
Publication
Note
  • Typescript
  • Vita
Bibliography note
Includes bibliographical references (leaves 112-113)
Carrier category
online resource
Carrier category code
cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
txt
Content type MARC source
rdacontent
Control code
48776682
Dimensions
29 cm
Dimensions
unknown
Extent
xiv, 132 leaves
Media category
computer
Media MARC source
rdamedia
Media type code
c
Other physical details
illustrations
Specific material designation
remote
Label
Investigation of low-pressure laser induced fluorescence for measuring temperature profiles in a rarefied gas, by Thomas O. Leimkuehler
Publication
Note
  • Typescript
  • Vita
Bibliography note
Includes bibliographical references (leaves 112-113)
Carrier category
online resource
Carrier category code
cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
txt
Content type MARC source
rdacontent
Control code
48776682
Dimensions
29 cm
Dimensions
unknown
Extent
xiv, 132 leaves
Media category
computer
Media MARC source
rdamedia
Media type code
c
Other physical details
illustrations
Specific material designation
remote

Library Locations

    • Engineering Library & Technology CommonsBorrow it
      W2001 Lafferre Hall, Columbia, MO, 65211, US
      38.946102 -92.330125
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