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不同温度亚微米粒子扩散运动的实验研究 被引量:2

Experimental study on the diffusive motions of submicron particles under different temperatures
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摘要 利用Micro-PIV/PTV技术对不同温度下的方形槽内520 nm粒子的扩散运动进行了实验研究.采用PIV/PTV混合算法,计算得到了时间间隔为30 ms的相邻帧图像中示踪粒子的位移,由此计算出示踪粒子位移平方的对数分布与空间均方位移.结果表明,相同温度不同时刻粒子位移分布基本一致,粒子位移平方的对数分布于-17~-11之间,呈现类正态分布特征.粒子的空间均方位移值随着温度的升高而线性增大,表明粒子的扩散能力随温度的升高逐渐增强. Diffusive motions of 520 nm particles under different temperatures in a square channel were studied by Micro-PIV/PTV technique.Employing the PIV/PTV hybrid algorithm,the displacements of tracer particles in a couple of fames images within 30 ms time intervals were evaluated.The logarithm distributions of square displacements and the spatial mean square displacements were calculated.The results show that the distributions of particle displacements are fundamentally under the same temperature at different mom...
出处 《中国计量学院学报》 2010年第4期305-309,331,共6页 Journal of China Jiliang University
基金 国家自然科学基金资助项目(No.10702066) 浙江省自然科学基金资助项目(No.Y7080398)
关键词 亚微米粒子 扩散运动 空间均方位移 sub-micrometer particle diffusive motion spatial mean square displacement
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参考文献15

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