Controlling Ejection State of a Pneumatic Micro-droplet Generator Through Machine Vision Methods

Wang, Fei; Wang, Yiwei; Bao, Weijie; Zhang, Hui; Li, Jiangeng; Wang, Zhihai

doi:10.1007/s12541-019-00295-7

Cited by 7 publications

(12 citation statements)

References 11 publications

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“…In the present study for the first time thermos-viscose expansion is used for fluid actuation and droplet generation. To this end, the first fluid behavior was investigated without application of the Gaussian temperature function of equation (17). Pressure on both sides of nozzle was considered equal to atmospheric pressure and Navier -Stokes, continuum and energy equations were solved for both fluids for time step of 0.01 microseconds to 1 second.…”

Section: Resultsmentioning

confidence: 99%

“…After ensuring the initial equilibrium of fluids, water was actuated by using the Gaussian temperature of equation (17). Figure 11 shows the droplet generation process and water injection due to thermos-viscose expansion.…”

Section: Resultsmentioning

confidence: 99%

“…where λ=700µm is the wavelength, b=200µm is the bandwidth of the laser beam. According to equation (17), temperature alternately changes versus x and t. Heating causes an increase in the volume of water inside expansion chamber, causing the fluid to exit the tank. Since the diameter on the left side of the chamber is very small, water exits from the right side, which yields to generating micro droplets.…”

Section: Geometry Of Microchannelmentioning

confidence: 99%

“…In droplet generation processes, the continuous generation of small droplets with constant distances and constant generation speeds is essential [8]. Therefore, droplet generation and movement processes and control methods for droplet diameters are of especial importance [9].…”

Section: Introductionmentioning

confidence: 99%

“…-Droplet generation using pneumatic actuators [16,17]: in which an air chamber (syringe) is used for actuating fluid and droplet generation.…”

Section: Introductionmentioning

confidence: 99%

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A New Micro Pump for Rapid and Accurate Microscale Droplet manipulation Using thermo-viscous Actuation

Mehrabi

Isfahani

2022

Scientia Iranica

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Current study proposes a novel mechanism for micro scale droplet generation. To this end, a new micro pump consisting of an expansion chamber with two nozzles at its left and right sides, is introduced which is capable of creating a unidirectional flow. In the current study, for the first time, thermo-Viscose expansion method is used to actuate the flow by assuming that the fluid is heated by using a laser beam source leading to expansion and movement of the fluid. Two-phase flow analysis using the VOF method showed that the proposed micro pump can consistently generate droplets with uniform and micro-scale dimensions. Keywords: Lab on a chip; Droplet; Thermo-Viscose expansion; Two-phase flow; Bio; Biofluidics 𝛼 𝑇 Volumetric thermal expansion coefficient th. Thermal 𝛼 Volume fraction function l Liquid 𝛿 𝑘𝑙 Kronecker delta g Gas 𝛿 𝑡ℎ.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Geometry Of Microchannelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…-Droplet generation using pneumatic actuators [16,17]: in which an air chamber (syringe) is used for actuating fluid and droplet generation.…”

Section: Introductionmentioning

confidence: 99%