Ejection Interaction of Two Adjacent Micropumps

Abstract

This research intends to apply thermal bubble micropumps to motorcycle’s fuel atomizer system with ink and Stoddard solvent as the work liquids, and then utilize computational fluid dynamics to discuss the fluid interaction of two adjacent micropumps under continuous ejection with time lag, which covers the particle shape and movement track of ejected droplets, fluid interaction of ejected droplets, and velocity of droplets as well as work liquid replenishment. The micropump consists of 50 independent micropumps, with orifice of 50μm in diameter and working frequency of 5kHz. As shown in results, when the external air velocity is 0m∕sec, the velocity of droplets ejected later is faster than that of droplets ejected earlier. If the work liquid is ink, the replenishing rate of two adjacent micropumps is higher than that of single micropump. If the work liquid is Stoddard solvent, the replenishing rate of two adjacent micropumps is similar to that of single micropump. When the external air velocity is 15.0m∕sec and work liquid is ink, the velocity of droplet ejected later is slower than that of droplet ejected earlier, and the replenishing rate of two adjacent micropumps is lower than that of single micropump with the external air velocity of 0m∕sec. If the work liquid is Stoddard solvent, the velocities of two adjacent droplets are approximate, while the replenishing rates of two adjacent micropumps are approximate to that of single micropump with the external air velocity of 0m∕sec.