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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental study on thermophoretic deposition of soot particles in laminar diffusion flames along a solid wall in microgravity
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Experimental study on thermophoretic deposition of soot particles in laminar diffusion flames along a solid wall in microgravity

机译：微重力下层流扩散火焰中烟尘颗粒热泳沉积的实验研究

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摘要

Soot deposition process in diffusion flames along a solid wall has been investigated experimentally under a microgravity environment. An ethylene (C2H4) diffusion flame was formed around a cylindrical rodburner with the surrounding air velocities of V-a = 2.5, 5, and 10 cm/s, the oxygen concentration of 35%, and the burner wall temperature of 300 K. A laser extinction method was adopted to measure the distribution of soot volume fraction. The experiments determined the trace of maximum soot concentration together with the relative distance of the trace of flame. Results showed that the distance was about 2-5 mm. As the surrounding air velocity increased, the region of the soot particle distribution moved closer to the burner wall. The soot particles near the flame zone tended to move away from the flame zone because of the thermophoretic force and to concentrate at a certain narrow region inside the flame. Because of the simultaneous effects of convection and the thermophoresis, soot particles finally adhered to the burner wall. It has been found that there existed an optimal air velocity for the early deposition of soot on the furnace wall. (C) 2008 Elsevier Inc. All rights reserved.
机译：在微重力环境下，已经对沿着固体壁的扩散火焰中的烟灰沉积过程进行了实验研究。在圆柱形棒状燃烧器周围形成乙烯（C2H4）扩散火焰，其周围空气速度为Va = 2.5、5和10 cm / s，氧气浓度为35％，燃烧器壁温为300K。激光熄灭用该方法测量烟灰体积分数的分布。实验确定了最大烟灰浓度的痕迹以及火焰痕迹的相对距离。结果显示该距离约为2-5 mm。随着周围空气速度的增加，烟尘颗粒分布的区域移近燃烧器壁。由于热泳力，靠近火焰区域的烟灰颗粒趋向于移离火焰区域，并集中在火焰内部的某个狭窄区域。由于对流和热泳的同时作用，烟灰颗粒最终粘附在燃烧器壁上。已经发现对于烟灰在炉壁上的早期沉积存在最佳的空气速度。 （C）2008 Elsevier Inc.保留所有权利。

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