Abstract
Experiments were done to observe droplets of n-heptane impacting on a hot stainless steel surface in a low gravity environment. Impacting droplets were photographed using a single-shot flash-photographic method. Cellular structures were observed in the spreading liquid film, even in absence of buoyancy forces, when surface temperatures exceeded 80°C. The cells were attributed to surface tension driven flows in the liquid. A simple heat conduction model was used to estimate temperature gradients in the liquid film, and to calculate the Marangoni Number (Ma). The onset of cellular structures in the liquid film corresponded to Ma>80, confirming predictions from instability theory. Droplets in Leidenfrost evaporation were pushed away from the surface by the pressure of the vapour below them. Reducing gravity level had no influence on the dynamics of droplet impact, or on bubble movement in nucleate boiling.
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