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TECHNICAL PAPERS

Ejection Interaction of Two Adjacent Micropumps

[+] Author and Article Information
H.-P. Cheng1

Air-Conditioning and Refrigeration Engineering, National Taipei University of Technology, Add: 1, Sec. 3, Chung-Hsiao E. Rd., Taipei 106, Taiwan, R.O.C.hpcheng@ntut.edu.tw

C.-P. Chien

Mechanical Industrial Research Laboratories, Advance Vehicle & Power Technology Division,  ITRI, Add: Bldg. 58, 195-3, Sec. 4 Chung Hsing Rd., Chutung, Hsinchu, 310, Taiwan, R.O.C.

1

Corresponding author.

J. Fluids Eng 128(4), 742-750 (Jan 17, 2006) (9 pages) doi:10.1115/1.2201638 History: Received April 18, 2005; Revised January 17, 2006

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 $0m∕sec$.

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Topics: Bubbles , Micropumps , Shapes , Inks

Figures

Figure 1

Picture of micropump and passageway structure

Figure 8

Tendency chart of internal velocity field under case I

Figure 9

Comparison diagram of work liquid replenishment under cases I and III

Figure 2

Bubble formation and time relation

Figure 3

Boundary setting for numerical simulation and key dimension description for calculation domain

Figure 4

Computational mesh for numerical simulation

Figure 5

Observational diagram of ejected droplets in case II

Figure 6

Comparison diagram of ejected droplets of micropump

Figure 7

Velocity field diagram of ejected droplets of micropump

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