Analysis of accommodation coefficients of noble gases on aluminum surface with an experimental/computational method
Analysis of accommodation coefficients of noble gases on aluminum surface with an experimental/computational method
复制标题
实验/计算方法分析铝表面惰性气体的适应系数
DOI：
10.1063/1.3187932
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发表时间：
2009
影响因子：
4.6
通讯作者：
A. Ketsdever
中科院分区：
文献类型：
--
作者：
N. Selden;N. Gimelshein;S. Gimelshein;A. Ketsdever
本文提出了一种将过渡流区加热叶片辐射力的测量与流动的动力学模拟相结合，并通过对测量结果和计算结果的连续分析来推导调节系数的方法。该方法利用的事实，即辐射力施加在加热物体浸在稀薄气体是由气体分子与表面的相互作用。在3米长的真空室中，在纳米牛顿推力台上获得了直径为0.11米的圆形叶片上的辐射力的实验结果，压力范围为约0.01至1帕。叶片在热侧被加热到419 K，在冷侧被加热到396 K。数值模拟进行使用组合椭球统计Bhatnagar-Gross-Krook/直接模拟蒙特卡罗方法，允许准确和时间效率的分析，在大型真空室中的叶片上的辐射力充满稀薄气体。适应系数为...
A method that connects measurements of radiometric forces on a heated vane in the transitional flow regime with the kinetic modeling of the flow, and derives the accommodation coefficients through the successive analysis of measured and computed results, is proposed. The method utilizes the fact that radiometric forces exerted on heated objects immersed in rarefied gases are governed by the interaction of gas molecules with the surface. Experimental results on radiometric forces on a 0.11 m diameter circular vane are obtained on a nano-Newton thrust stand in a 3 m long vacuum chamber for pressures ranging from approximately 0.01 to 1 Pa. The vane was heated to 419 K on the hot side and 396 K on the cold side. The numerical modeling is conducted using a combined ellipsoidal statistical Bhatnagar–Gross–Krook/direct simulation Monte Carlo approach that allows accurate and time efficient analysis of radiometric forces on a vane in large vacuum chambers filled with rarefied gas. Accommodation coefficients for ...