Abstract-
Gaseous fuel injected through a spinning porous disk into air can produce a
variety of different patterns of diffusion flames that hug the surface of the
disk. The flow field is that of the viscous pump analyzed by Th. Von Karman in
1921. Under appropriate conditions the diffusion flames are flat spirals with
sharp leading edges and more diffuse trailing edges. The spirals spin,
generally in the opposite direction of the disk, and the nose of the spiral
meanders. Efforts to understand these phenomena will be described.
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