Imaging in Transport Processes

ISBN Print: 978-1-56700-382-6

MEASUREMENT OF DIRECT-CONTACT CONDENSATION OF SATURATED VAPOR ON SUBCOOLED DROPLETS BY PULSED LASER HOLOGRAPHY

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Anseimo Chavez Lehrstuhl A für Thermodynamik, Technische Universität München, Arcisstr. 21, 8000 Munchen 2, Germany

Peter Gebhard Dipl.-Ing., Lehistuhl A für Thermodynamik, Technische Universität München, Arcisstr. 21, 8000 München 2, Germany

Franz Mayinger Lehrstuhl A für Thermodynamik, Technische Universität München, München, Germany; Technical University, Hannover, FRG Institut fur Verfahrenstechnik, Hanover, Germany

Sinopsis

Here we investigate the growth rate of subcooled droplets injected into saturated vapor of the same substance by applying pulsed laser holography. Taking single and double pulsed holograms of the spray droplets at steady-state conditions, it is possible to measure increments in droplet size caused by the condensation of the vapor. Single pulsed holograms supply information about position, distribution and concentration of the droplets in the injection volume. Double pulsed (i.e. double exposure) holograms also provide information about the velocity distribution of the droplets, which is necessary for the computation of the residence time in the volume of interest.

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