Experimental Study on the Brownian Diffusion of Submicron Particles in Microchannel Based on the Micro-PIV/PTV Technique
In this paper, the diffusive motions of 520 nm fluorescent particles were measured by using micro-PIV/PTV system under different flow rates at the water temperatures of 300 K and 313 K. By using the algorithms of the particle tracking velocity (PTV) and the ensemble correlation, the displacements of tracer particles in a couple of fames images were evaluated, and the mean square displacements (MSDs) at any coordination in images were calculated. Based on this, the spatial mean square displacements (SMSDs) was calculated, and the relationship between the SMSDs of particles and the flow rates was obtained. The results show that SMSDs drop with increase of flow rates, and the values of SMSD tend to the constants. The diffusive capabilities of particles in the streamwise direction are stronger than that in the spanwise direction.
submicron particles Brownian diffusion micro-PIV/PTV technique spatial mean square displacement
M. Yang H.L. Wang W. Han
Institute of Fluid Measurement and Simulation, China Jiliang University, Hangzhou 310018, China
国际会议
广州
英文
626-628
2011-06-30（万方平台首次上网日期，不代表论文的发表时间）