VAPOUR BUBBLE GROWTH

in colaboration with LIMSI-CNRS (Project PAN - CNRS no 6417)

 


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vapour movie
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Vapor bubble growing on the heated wire.

The growth of a single microscopic vapour bubble is investigated experimentally [61,69,77]. Details of the shape development of the bubble and velocity of the interface are studied using especially developed image processing scheme. The interface velocity is evaluated for sequences of images using advantageous of ODP-PIV [56]. method for non-seeded flow. The edge detection procedure used allows to resolve location of the bubble contour within 2 - 3um resolution. Its shape interpolated using Bzier polynomials is used to evaluate the local components of the interface velocity. Profiles for all components of the interface velocity are given for an exemplary analysed 150m bubble of methyl alcohol growing on a thin wire.

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PIV evaluated velocity vectors of the interface (left) and variation of the normal velocity of the interface along perimeter of the bubble (right) [69]
(click image to zoom).

The growth and detachment of a single water vapour bubble was studied under low pressure conditions (P=5kPa) [176]. The movie below illustrates growth, departure and implosion of a vapour bubble.
bubble movie
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Departure and implosion of the vapor bubble growing on the heated surface; water, P=5kPa, T=307K

The flow seeded with thermochromic liquid crystals is used to visualize the temperature and velocity fields surrounding the bubble. Particle Image Thermometry and Velocimetry is applied to obtain quantitative data.

colour bubble movie
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Departure and implosion of the vapor bubble growing on the heated surface. Velocity field surrounding the bubble shown in previous movie, liquid crystal tracers used for visualization.

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Particle Image Thermometry and Velocimetry applied to the flow field surrounding the vapour bubble

POSTER Load our poster presented by M.-C. Deluc at SFT2001 (Nantes)


Tomasz Kowalewski
April 30 20:30:04 MET 2003