Velocity Distribution of Vibration-driven Granular Gas in Knudsen Regime in Microgravity

	Velocity Distribution of Vibration-driven Granular Gas in Knudsen Regime in Microgravity
	Hou, M. ; Liu, R. ; Zhai, G. ; Sun, Z. ; Lu, K. ; Garrabos, Y. ; Evesque, P.
刊名	Microgravity Science and Technology
	2008
卷号	20 期号:2 页码:73-80
关键词	Granular gas Velocity distribution
ISSN号	0938-0108 1875-0494
通讯作者	北京8701信箱
英文摘要	Dynamics of quasi-2D dissipative granular gas is studied in micro-gravity condition (of the order of 10−4 g) in the limit of Knudsen regime. The gas, made of 4 spheres, is confined in a square cell enforced to follow linear sinusoidal vibration in ten different vibration modes. The trajectory of one of the particles is followed for 2 hours, and is reconstructed from video data by particle tracking. From statistical analysis, we find that (i) loss due to wall friction is small, (ii) trajectory looks ergodic in space, and (iii) distribution ρ(ν) of speed follows an exponential distribution, i.e., ρ(v) ≈ exp −ν νx0,y0 , with νx0,y0 being a characteristic velocity along a direction parallel (y) or perpendicular (x) to vibration direction. This law deviates strongly from the Boltzmann distribution of speed in molecular gas. Comparisons of this result with previous measurements in earth environment, and what was found in 3D cell (Falcon et al., Europhys Lett 74:830, 2006) performed in environment of about ±5 × 10−2 g are given.
学科主题	空间技术
收录类别	SCI
原文出处	http://www.springerlink.com/content/c178100610153727/fulltext.pdf
语种	英语
内容类型	期刊论文
源URL	[http://ir.cssar.ac.cn/handle/122/580]
专题	国家空间科学中心_空间技术部
推荐引用方式 GB/T 7714	Hou, M.,Liu, R.,Zhai, G.,et al. Velocity Distribution of Vibration-driven Granular Gas in Knudsen Regime in Microgravity[J]. Microgravity Science and Technology,2008,20(2):73-80.
APA	Hou, M..,Liu, R..,Zhai, G..,Sun, Z..,Lu, K..,...&Evesque, P..(2008).Velocity Distribution of Vibration-driven Granular Gas in Knudsen Regime in Microgravity.Microgravity Science and Technology,20(2),73-80.
MLA	Hou, M.,et al."Velocity Distribution of Vibration-driven Granular Gas in Knudsen Regime in Microgravity".Microgravity Science and Technology 20.2(2008):73-80.