A Highly-Viscous Liquid Jet Generator

Onuki, Hajime; Tagawa, Yoshiyuki

doi:10.3811/jjmf.29.335

Cited by 2 publications

(8 citation statements)

References 10 publications

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“…Note that the increment ratio β is calculated for each result. The experimental results obtained using a tube with a large inner radius r ¼ 1 mm (ν ¼ 1-1000 mm 2 =s) [15] are also shown in Fig. 8(b).…”

Section: B Focusing Interval: Microjet Generationmentioning

confidence: 84%

“…Recently, we proposed a simple technique for generating highly viscous liquid jets [15]. A schematic illustration of the proposed microjet generator is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…1(a). We now briefly explain the idea for generating highly viscous liquid jets [15], which relies on three tricks: (1) application of an impulsive force on a liquid by applying an impact at the bottom of the liquid-filled container, (2) a thin tube inserted into the liquid, where the liquid level inside the tube is set deeper than that outside the tube, and (3) flow focusing at the gas-liquid interface, which initially has a concave shape. A focused liquid jet forms at the interface The liquid level inside the thin tube is kept deeper than that outside the tube by decompressing the air outside the tube.…”

Section: Introductionmentioning

confidence: 99%

“…The circles and squares are the experimental and simulation results, respectively. The triangles are experimental data obtained using a thin tube with a large inner radius r ¼ 1 mm (ν ¼ 1-1000 mm 2 =s)[15].…”

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confidence: 99%

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Microjet Generator for Highly Viscous Fluids

Onuki

Tagawa

2018

Phys. Rev. Applied

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This paper describes a simple system for generating a highly viscous microjet. The jet is produced inside a wettable thin tube partially submerged in a liquid. The gas-liquid interface inside the tube, which is initially concave, is kept much deeper than that outside the tube. An impulsive force applied at the bottom of a liquid container leads to significant acceleration of the liquid inside the tube followed by flow focusing due to the concave interface. The jet generation process can be divided into two parts that occur in different time scales, i.e., the impact interval [impact duration ≤ Oð10 −4 Þ s] and the focusing interval [focusing duration ≫ Oð10 −4 Þ s]. During the impact interval, the liquid accelerates suddenly due to the impact. During the focusing interval, the microjet emerges due to flow focusing. In order to explain the sudden acceleration inside the tube during the impact interval, we develop a physical model based on a pressure impulse approach. Numerical simulations confirm the proposed model, indicating that the basic mechanism of the acceleration of the liquid due to the impulsive force is elucidated. Remarkably, the viscous effect is negligible during the impact interval. In contrast, during the focusing interval, the viscosity plays an important role in the microjet generation. We experimentally and numerically investigate the velocity of microjets with various viscosities. We find that higher viscosities lead to reduction of the jet velocity, which can be described by using the Reynolds number (the ratio between the inertia force and the viscous force). This device may be a starting point for next-generation technologies, such as high-viscosity inkjet printers including bioprinters and needle-free injection devices for minimally invasive medical treatments.

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Section: B Focusing Interval: Microjet Generationmentioning

confidence: 84%

“…Recently, we proposed a simple technique for generating highly viscous liquid jets [15]. A schematic illustration of the proposed microjet generator is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Microjet Generator for Highly Viscous Fluids

Onuki

Tagawa

2018

Phys. Rev. Applied

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“…Recently, we proposed a simple yet novel technique for generating highly viscous liquid jets [14]. A schematic illustration of the proposed microjet generator is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Highly Viscous Microjet Generator

Onuki,

Oi,

Tagawa

2017

Preprint

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This paper describes a simple yet novel system for generating a highly viscous microjet. The jet is produced inside a wettable thin tube partially submerged in a liquid. The gas-liquid interface inside the tube, which is initially concave, is kept much deeper than that outside the tube. An impulsive force applied at the bottom of a liquid container leads to significant acceleration of the liquid inside the tube followed by flow-focusing due to the concave interface. The jet generation process can be divided into two parts that occur in different time scales, i.e. the Impact time (impact duration ≤ O(10 −4 ) s) and Focusing time (focusing duration O(10 −4 ) s). In Impact time, the liquid accelerates suddenly due to the impact. In Focusing time, the microjet emerges due to flowfocusing. In order to explain the sudden acceleration inside the tube in Impact time, we develop a physical model based on a pressure impulse approach. Numerical simulations confirm the proposed model, indicating that the basic mechanism of the acceleration of the liquid due to the impulsive force is elucidated. Remarkably, the viscous effect is negligible in Impact time. In contrast, in Focusing time, the viscosity plays an important role in the microjet generation. We experimentally and numerically investigate the velocity of microjets with various viscosities. We find that higher viscosities lead to reduction of the jet velocity, which can be described by using Reynolds number (the ratio between the inertia force and the viscous force). This novel device may be a starting point for next-generation technologies, such as high-viscosity inkjet printers including bioprinters and needle-free injection devices for minimally invasive medical treatments.

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A Highly-Viscous Liquid Jet Generator

Cited by 2 publications

References 10 publications

Microjet Generator for Highly Viscous Fluids

Microjet Generator for Highly Viscous Fluids

Highly Viscous Microjet Generator

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