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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Journal of Flow Visualization and Image Processing
SJR: 0.11 SNIP: 0.312 CiteScore™: 0.1

ISSN Печать: 1065-3090
ISSN Онлайн: 1940-4336

Выпуски:
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Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v8.i2-3.70
11 pages

MOLECULAR TAGGING FLUORESCENCE VELOCIMETRY (MTFV) FOR LAGRANGIAN FLOW FIELD MAPPING INSIDE EVAPORATING MENISCUS: POTENTIAL USE FOR MICROSCALE APPLICATIONS

J. S. Park
Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123, USA
H. J. Kim
Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123, USA

Краткое описание

The development of a molecular tagging fluorescence velocimetry (MTFV) system is discussed, and measurement results are presented for a meso-scale flow field of a thermally driven capillary pore of 5 mm inner diameter that is tilted 5° from the horizon. The technique uses caged dextran conjugates of caged fluorescence dyes of less than 10 nm in size for tracers. The frequency-tripled ultra violet (UV) band (l = 355 nm) of a pulsed neodymium-yttrium-aluminum-garnef (Nd:YAG) laser uncages the molecules by photo-cleaving—that is, decomposition of a caging and a fluorescence chemical group. Then a continuous wave (CW) blue argon ion laser (l = 488 n) pumps the fluorescence of only those uncaged molecules whose emission band is centered at l = 518 nm, and a sequential recording of the fluorescence images are digitally created and analyzed for Lagrangian velocity field mapping. The use of the technique allows detailed measurements of the thermally driven three-dimensional flow inside a heated capillary pore. The measurements show that the meniscus surface flow is mainly driven by the thermocapillary stress field, resulting from the surface temperature gradient, while the bulk flow inside the pore is driven largely by the natural convection buoyancy.


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