Simulations for A Novel Fluid Dispensing Technology Based on Gas-liquid Slug Flow
The fluid dispensing is one of the key technologies in electronic packing. A novel approach of non-contact fluid dispensing has been proposed based on the principle of gasliquid two-phase flow. In view of gas-liquid two-phase dynamics, the flow pattern of slug flow can be obtained stably in the microchannel as the flow rate ratio between the gas and liquid is in an appropriate range. The slug flow can generate fluid droplets and gas bubbles and spray them out of the nozzle with uniform interval, accurate volume, good consistency, high controllability and no back haul. This paper carried out the numerical simulation to investigate the gasliquid two-phase flow in the microchannel for the adhesive dispensing. A 2-D model of microchannel with a diameter for 0.04 mm was established and meshed. The gas-liquid slug flow emerges after iterating over 1 million steps with the gas flow rate for 0.1 m/s, the water flow rate for 0.05 m/s. The wetting property controlled by the contact angle had been discussed to present different liquid materials application. The poor wetting of liquid benefited for conforming droplets shape and avoiding droplets crashing and back haul. While the gas flow rate decreased, the length of liquid droplet and gas bubble increased and decreased, respectively and the total numbers of bubble and droplet decreased in one period. This indicated the fluid parameters have a high relationship with the quantity and volume of droplet.
Peng Peng Jianhua Zhang Jinsong Zhang
Key Laboratory of Advanced Display and System Applications of Ministry of Education, Shanghai University, China School of Mechatronics Engineering and Automation, Shanghai University, China Yanchang Road 149, Shanghai City, China
国际会议
上海
英文
756-760
2011-08-08（万方平台首次上网日期，不代表论文的发表时间）