Spatially Resolved Temperature Measurements in a Liquid Using Laser Induced Phosphorescence

2001 ◽  
Vol 123 (2) ◽  
pp. 293-302 ◽  
Author(s):  
S. L. Thomson ◽  
D. Maynes
Keyword(s):  
Recent Progress ◽  
Fluid Velocity ◽  
Temperature Data ◽  
Temperature Measurements ◽  
Experimental Methodology ◽  
Molecular Tagging Velocimetry ◽  
Molecular Tagging ◽  
Spatially Resolved ◽  
Simultaneous Measurements ◽  
Measurement Methodology

This paper describes recent advances in the development of a temperature measurement methodology based on phosphorescence of a tracer molecule in a liquid. The methodology represents an extension of molecular tagging velocimetry (MTV). MTV is a laser-based technique of obtaining spatially resolved fluid velocity profiles. The methodology has the potential of providing spatially resolved simultaneous measurements of velocity and temperature data over a planar domain. Presently, a method of obtaining temperatures over a range of 30°C with a typical uncertainty of ±1.0–1.5°C has been developed. Recent progress has resulted in a method of generating robust calibration curves for use in subsequent temperature measurements. A discussion of the experimental methodology, calibration curve development, and error analysis is presented. Finally, simultaneous temperature and velocity profile measurements using the method are demonstrated under dynamic conditions.

Molecular Tagging Techniques for Micro-Flow and Micro-Scale Heat Transfer Studies

2009 ◽  
Author(s):  
Hui Hu ◽  
Manoochehr Koochesfahani
Keyword(s):  
Heat Transfer ◽  
Fluid Velocity ◽  
Transient Behavior ◽  
Diagnostic Techniques ◽  
Temperature Measurements ◽  
Phosphorescence Lifetime ◽  
Molecular Tagging ◽  
Micro Scale ◽  
Flow Variables ◽  
Tracer Molecules

We report recent progresses made in development of novel molecule-based flow diagnostic techniques, named as Molecular Tagging techniques, to achieve simultaneous measurements of multiple important flow variables (such as flow velocity and temperature) for micro-flows and micro-scale heat transfer studies. Instead of using tiny particles, specially-designed phosphorescent molecules, which can be turned into long-lasting glowing molecules upon excitation by photons of appropriate wavelength, are used as tracers for both velocity and temperature measurements. A pulsed laser is used to “tag” the tracer molecules in the regions of interest, and the movements of the tagged molecules are imaged at two successive times within the photoluminescence lifetime of the tracer molecules. The measured Lagrangian displacement of the tagged molecules between the two image acquisitions provides the estimate of the fluid velocity vector. The simultaneous temperature measurement is achieved by taking advantage of the temperature dependence of phosphorescence lifetime, which is estimated from the intensity ratio of the tagged molecules in the two images. The implementation and application of the MTV&T technique are demonstrated by conducting simultaneous velocity and temperature measurements to qunatify the transient behavior of electroosmotic flow (EOF) inside a microchannel and to reveal the unsteady heat transfer, mass transfer and phase changing process inside micro-sized water droplets pertinent to wind turbine icing phenomena.

Development of a Temperature Profile Measurement Technique Based on Molecular Tagging Velocimetry

1999 ◽  
Author(s):  
Scott L. Thomson
Keyword(s):  
Image Analysis ◽  
Laser Beam ◽  
Temperature Measurement ◽  
Temperature Profile ◽  
Measurement Technique ◽  
Temperature Measurements ◽  
Profile Measurement ◽  
Molecular Tagging Velocimetry ◽  
Molecular Tagging ◽  
Temperature Measurement Technique

Abstract The development of a new laser-based temperature measurement technique is explained. The technique is based on molecular tagging velocimetry (MTV), an established, non-intrusive method of obtaining velocity profiles throughout a fluid. MTV works by dissolving a photoluminescent chemical in water and directing an ultraviolet laser beam into the solution. The intensity of the light emitted by the chemical upon excitation by the UV beam is inversely related to the temperature of the fluid. Recent research has been directed towards quantifying this temperature-intensity relationship. The method of obtaining temperature measurements, including equipment setup and image analysis, is explained, and a summary of results is given.

scholarly journals Photoisomeric molecular tagging velocimetry with CCVJ

2021 ◽  
Vol 6 (4) ◽  
Author(s):  
Markus J. Schmidt ◽  
Benno Käslin ◽  
Thomas Rösgen
Keyword(s):  
Molecular Tagging Velocimetry ◽  
Molecular Tagging

Quantitative NO2 molecular tagging velocimetry at 500 kHz frame rate

2010 ◽  
Vol 97 (22) ◽  
pp. 221103 ◽  
Author(s):  
Naibo Jiang ◽  
Munetake Nishihara ◽  
Walter R. Lempert
Keyword(s):  
Frame Rate ◽  
Molecular Tagging Velocimetry ◽  
Molecular Tagging

Kinetics of NO Tag Formation in Air for Unseeded Molecular Tagging Velocimetry

2004 ◽  
Author(s):  
Sastri Nandula ◽  
Robert Pitz ◽  
Jeroen Bominaar ◽  
Coralie Schoemaecker ◽  
Nico Dam ◽  
...  
Keyword(s):  
Molecular Tagging Velocimetry ◽  
Molecular Tagging ◽  
Kinetics Of
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