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Journal of Flow Visualization and Image Processing
SJR: 0.11 SNIP: 0.312 CiteScore™: 0.1

ISSN Print: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v11.i2.40
12 pages

FLOW SIMULATION AND VISUALIZATION OF A MICRODROPLET GENERATOR

Chung-Chu Chen
E. L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA
Chen-Kuei Chung
Department of Mechanical Engineering, National Cheng Kung University, Taiwan 701, ROC
Shih-Huei Chen
Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan 300, ROC
Tong-Ming Liou
Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan 300, ROC

ABSTRACT

This paper investigates droplet characteristics and refill time of the microdroplet generators with different shape of actuator and actuation amplitude. The simulation results show that a ring-type actuator provides the best performance on the droplet trajectory and ink refill time. Droplets generated by the ring-type actuator have the shortest initial pillar length and the least velocity inconsistency. Hence, the occurrence of satellite droplet is diminished. Square- and circle-type actuators have a refill time of 67 and 61 μs, respectively, up to 37% larger than the value of 49 μs of the ring-type actuator. For the ring-type actuator, the droplet size, tip velocity, and refill time are in proportion to the actuation amplitude for a given nozzle diameter.


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