Open AccessPrediction Models of Droplet Characteristics Based on the Locally Convergent Configurations in PMMA Microchips
Author(s) -
Zhongxin Liu,
Zhiliang Wang,
Chao Wang,
Zhang Jin-song
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2097/1/012027
Subject(s) - dimensionless quantity , tapering , volumetric flow rate , exponential function , materials science , position (finance) , phase (matter) , mechanics , flow (mathematics) , coaxial , phase angle (astronomy) , analytical chemistry (journal) , capillary action , exponential growth , mathematics , composite material , optics , physics , mathematical analysis , chemistry , chromatography , electrical engineering , computer science , engineering , computer graphics (images) , finance , economics , quantum mechanics
This paper novel designed the local convergence configuration in the coaxial channels to study the two-phase flow (lubricating oil (continuous phase, flow rate Q c )/deionized water (dispersed phase, flow rate Q d )). Two geometric control variables, the relative position ( x ) and tapering characteristics ( α ), had the different effects on the droplet formation. The increase of relative position x caused the higher frequency and finer droplets, and the increase of convergence angle α , took the opposite effects. The results indicated that the equivalent dimensionless droplet length L d /W out and the flow rate ratio Q d /Q c had an exponential relationship of about 1/2. Similarly, it was found that the dispersed droplets generating frequency and the two-phase capillary number, Ca TP = u TP μ c /σ , had an exponential relationship. The advantage of the convergent configurations in micro-channel was the size and efficiency of droplet generation was very favorable to be controlled by α and x .