A Study on Atomizing Characteristics of Spray Deposition and Mathematical Modelling of Deposition Stage

• Main Authors: Rai-Wen Lin, 林瑞文
• Other Authors: Chi-Yuan Albert Tsao
• Format: Others
• Language: zh-TW
• Published: 1995
• Online Access: http://ndltd.ncl.edu.tw/handle/57498383073410866317

碩士 === 國立成功大學 === 材料科學(工程)研究所 === 83 === For the "Dual-atomizer" technique, water simulation was used to the effects of the process parameters such as types of distance between upper- and lower-atomizer, and gas pressures of atomizers, on surpressing back-pressure induced byThe experiment results reveal that type of upper-atomizer has a effect on surpressing the back-pressure. The diameter of the of the upper-atomizer which is smaller than that of thehas a larger surpressing effect. With a given gas pressure of the change in distance between upper- and lower-atomizer has no effect on the gas pressure of the upper atomizer required to back-pressure. As the gas pressure of the lower atomizer larger the back-pressure, the larger the gas pressure of the required. The "Dual-atomizer" technique is effective in the within the PL-Pu chart. From the experimental results of Pb-Sn simulation, the idea of "Dual-atomizer" techique is proved to be practical. The different morphologies of droplets with different sizes are resulted from difference in solidification rate. The two peaks shown on size distribution are the reflection of the characteristics of the atomization stage during spray deposition. The temperature variations taking place during spray deposition analyzed using a finite difference method based on one-dimension transfer formulation incorporating with the moving boundary