Practical Measurement of the Diameter and Specification of the Particles with Micro-size level using the Appropriate Phenomena of Micro-Step Flow.

为解决环境工程中颗粒场控制流动与换热的问题，在微通道内对多粒径颗粒混合的流动与换热进行了实验研究。在微尺寸的区域中，不容易通过装置和外力来控制局部增加和减少的热传递，但是可以使用流动中的多尺寸荧光颗粒的混合物的非直接现象来执行。由于速度分布的不同，不同粒径颗粒的运动轨迹可能与不同粒径颗粒的阻力效应不同。然后，速度分布将改变更强调由大尺寸颗粒和通过由中等尺寸的颗粒。实验结果表明，通过连续的图像和不成熟的图像分析，得到了一些定性的有趣的结果，而定量的结果将在建立和确定新的图像处理方法后得到并报告。混合颗粒和微阶跃流效应的数据库将通过颗粒的跟踪线来指示颗粒的直径和规格，这将对环境工程系统中特殊颗粒的检测与实际情况的应用非常有用。

In micro-channel flow with backward facing step, the effects of the flow and heat transfer with the mixture of multi-size particles are investigated experimentally for the control of the flow and heat transfer with particles field for the environmental engineering. In the area of micro-size, it is not easy to control the heat transfer with increasing and decreasing locally by devices and external forces but it is possible to perform using non-direct phenomena with the mixture of multi-size fluorescent particles in the flow. Because of the velocity distribution, the tracking line of multi-size particles may be different from the drag effects of the each body size. Then, the velocity distribution would be changed more emphasized by big-sized particles and passing by mid-sized particles. It would be needed three kind of particle size at least to perform and detect the phenomena.From the results, several qualitative interesting effects were given with the continuous pictures and immature image analysis, and the quantitative results would be got and reported after the building and confirming the newer image processing methods. The data-base of the effects with the mixture particles and micro-step flow would indicate the diameter and specifications of the particle with tracking line of particles, which will be very useful for the applications of the detection of the special particles in the environmental engineering systems with the practical situations.