The Linkage Control Strategy for the Two-Phase Flow Dispensing System

The fluid dispensing technology has been widely used to deliver all kinds of fluids in electronic industry. This paper first put forward an initial approach based on the direct driving principle to dispense the liquid with a high consistency and precision. According to the direct driving principle, the gas-liquid slug flow should be formed as a stable pattern in the micro-channel while the flow rate ratio between the gas and liquid is in an appropriate range. The linkage control strategy had been done to realize the two-phase flow during the dispensing process. The two-phase flow dispensing system had seven sub-systems for integration to achieve the multi-functions. The control sub-system is the most important unit applying the industry personal computer to connect and control other sub-systems. It undertakes three main tasks, communication, data processing and feed-back control. As a result, the stream of compressed air injected into the continuous liquid stream controlled by the peristaltic pump, the bubbles and droplets appeared in the micro-channel separately and uniformly.