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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Transactions of the Canadian Society for Mechanical Engineering
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
