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- W2060864493 abstract "We consider the gasless combustion model of the SHS (self-propagating high temperature synthesis) process in which combustion waves are employed to synthesize desired materials. Specifically, we consider the combustion of a solid sample in which combustion occurs on the surface of a cylinder of radius R. We consider solution behavior as R is increased. This parameter is important for technological applications, as it is often desirable to synthesize large samples of the desired product. For the fixed value of the Zeldovich number considered, if R is sufficiently small, slowly propagating planar pulsating flames are the only modes observed. As R is increased transitions to more complex modes of combustion occur, including: (i) traveling waves (TWs), i.e., spin modes in which one or several symmetrically spaced hot spots rotate around the cylinder as the flame propagates along the cylindrical axis, thus following a helical path, (ii) counterpropagating (CP) modes, in which spots propagate in opposite angular directions around the cylinder, executing various types of dynamics, (iii) alternating spin CP (ASCP) modes, where rotation of a spot around the cylinder is interrupted by periodic events in which a new spot is spontaneously created ahead of the rotating spot. The new spot splits into CP daughter spots, one of which collides with the original spot leading to their eventual mutual annihilation, while the other continues to spin, (iv) modulated traveling waves (MTWs) consisting of either one or two symmetrically located rotating spots which exhibit a periodic modulation in speed and temperature as they rotate, (v) asymmetric traveling waves (ATWs) in which two spots of unequal strength and not separated by angle π, rotate together as a bound state, (vi) modulated asymmetric traveling waves (MATWs) in which the two asymmetric spots oscillate in a periodic manner as they rotate, alternately approaching each other and then moving apart periodically in time, (vii) asymmetric ASCP (AASCP) modes in which a slowly varying bound state of two spots rotates around the cylinder with the leading spot, and subsequently the trailing spot, exhibiting episodes of ASCP behavior, and (viii) 3-headed spins in which three spots rotate around the cylinder in a nonuniform fashion so that each cell alternately approaches one of its neighbors and then the other. In one case, referred to as MTW3, the motion is apparently quasiperiodic, with neighboring spots approaching and departing from each other periodically in time as they rotate. In another case, referred to as C3, the motion is apparently chaotic. Two neighboring spots nearly collide, after which one spot is rapidly propelled away from the other as they rotate. Finally, for a slightly higher value of R, two neighboring spots collide, leading to annihilation of one spot and collapse of the 3-headed spin to a 2-headed spin mode." @default.
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- W2060864493 date "2002-06-01" @default.
- W2060864493 modified "2023-10-17" @default.
- W2060864493 title "Dynamics of hot spots in solid fuel combustion" @default.
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- W2060864493 doi "https://doi.org/10.1016/s0167-2789(02)00387-1" @default.
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