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미소중력환경에서의 고체벽면근방 층류확산염내 매연입자의 열영동 부착
최재혁(Jae-Kyuk Choi),후지타 오사무(Fujita Osamu),정석호(Suk-Ho Chung) 한국연소학회 2007 KOSCOSYMPOSIUM논문집 Vol.- No.-
The deposition behavior of soot particles in a diffusion flame along a solid wall was examined experimentally by getting rid of the effect of natural convection utilizing micro gravity environment. The microgravity environment was realized by using a drop tower facility. The fuel for the flame was an ethylene (C₂H₄) and the surrounding oxygen concentration 35% with the surrounding air velocity of Va=2.5, 5, and 10 ㎝/s. Laser extinction method was adopted to measure the soot volume fraction distribution between the flame and burner wall. The results show that observation of soot deposition in normal flame was difficult from buoyancy and the relative position of flame and solid surface changes with time. The soot particle distribution region moves closer to the surface of the wall as the surrounding air velocity is increased. And the experiments determined the trace of the maximum soot concentration line. It was found that the distance between soot line and flame line is around 5 ㎜. That is, the soot particle near the flame zone tends to move away from flame zone because of thermophoretic force and to concentrate at a certain narrow area inside of the flame, finally, to adhere the solid wall.
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