Avatars of a Spreading Flame
This video titled “Avatars of a spreading flame” Shows the downward flame spread over two types of sub-millimetre cylindrical fuels in normal gravity and micro gravity environments. Here acrylic cylindrical strands of 1 mm diameter and wooden cylindrical strands of 0.6 mm diameter are used for the study. The flame spread over acrylic strands are studied at 21% and 40% oxygen level and the flame spread over wooden strands are studied at 25 and 40% oxygen level. The microgravity experiments are conducted at a ground-based drop tower facility at IITM. The front view and bottom view (in limited cases) are recorded using a Canon M50 Mark-2 camera at 50 fps rate. It is interesting to note the wide range of flame shapes or forms (avatars) at different oxygen levels and gravity levels, and hence are named appropriately.
Manu B V, Hrishikesh Babasaheb Gaikwad, and Amit Kumar (Indian Institute of Technology, Madras)
Blossoming Detonation
Select images from footage of a detonation tube’s muzzle arranged in a radial pattern akin to a flower and its pedals. The mixture used was stoichiometric H2/O2/N2 at 54% O2 by volume. 800 by 256-pixel images were captured with a Phantom high-speed camera recording at 15,000 fps and an exposure time of 45 microseconds. Radial distance from the center corresponds to later frames in the footage. Shock diamonds appear shortly into the recording.
Jacob Klein and Omid Samimi-Abianeh (Wayne State University)