The Technical Investigation and Development for Visualization of Flow in Microchannels

• Main Authors: Jun-sheng Huang, 黃俊勝
• Other Authors: Chen-Ching Ting
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/51229781708717414449

碩士 === 義守大學 === 機械與自動化工程學系碩士班 === 93 === The work aims to develop an automatic color Schlieren technique which uses a virtual color mask by projecting from a computer and a micro Schlieren technique for the flow visualization in micro channels. The virtual color mask is drawn by a computer and projected by an LCD projector. The projected color mask is then focused by a lens and set as color mask for the color Schlieren technique. The applied virtual color mask improves the color Schlieren technique without production of real color mask and let the automatic color Schlieren technique more feasibility. Moreover, the work has done some measurements and discussions about the relation between types of color mask and sensitivity of color Schlieren technique. The applied color mask is a RGB round color mask, which is presented by Settles in 1980. The results show that the best sensitivity of color Schlieren technique appears while the diameter of color mask between 9mm and 11mm as well as the color gap between 1mm and 1.5mm are. For development of the micro Schlieren technique the work aims to build a new technique for visualizing the smaller scale of flow in micro channels. The Schlieren technique is the method which visualizes the distribution of density for transparent flow. This work uses the micro Schlieren technique to visualize the heat water flow in water tank in the free boundary situation. The developed micro Schlieren technique has successfully visualized the scale of heat water flow in water tank in the free boundary situation for about 200 um .