Drag of a Laser Trapped Fine Particle in a Microregion
Drag of a Laser Trapped Fine Particle in a Microregion
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微区域中激光捕获细颗粒的阻力
DOI：
10.1143/jjap.39.1930
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发表时间：
2000
影响因子：
1.5
通讯作者：
H. Misawa
中科院分区：
文献类型：
--
作者：
M. Miwa;S. Juodkazis;H. Misawa
为了观察微区域中的流体动力学，我们应用激光扫描操作来测量作用于夹在两块玻璃板之间的矿物油中移动的细玻璃珠的阻力（油层厚度为33和64 µm）。我们测量的最大速度，VM，激光捕获珠在珠被释放。这使我们能够定量地确定阻力，阻力系数，CD，和雷诺数，R，在粘性流体的微区中的颗粒。结果，在两个玻璃板之间的中间获得最小CDR，并且CDR在更靠近壁处增加。此外，CDR的分布是在很好的协议与使用的壁效应在macroregions（超过0.1 mm）的方程计算的值。
To observe hydrodynamics in microregions, we applied laser scanning manipulation to measure the drag acting on a fine glass bead moving in mineral oil sandwiched between two glass plates (the thickness of the oil layer was a 33 and 64 µm). We measured the maximum velocity, VM, of a laser trapped bead at which the bead was released. This allowed us to quantitatively determine the drag, the drag coefficient, CD, and the Reynolds number, R, of the particle in the microregion of a viscous fluid. As a result, the minimum CDR was obtained midway between the two glass plates, and the CDR increased closer to the walls. Also, the distribution of CDR was in good agreement with the values calculated using the equation for wall effect in macroregions (over 0.1 mm).