Method for determining the aperture area and droplet ejection device

Abstract

To jet liquid in a suitable droplet state.SOLUTION: A method for determining aperture area S of a nozzle hole 13 for jetting liquid 3 in a droplet jetting device 25 comprising a flow channel 10 through which the liquid 3 flows and the nozzle hole 13, includes: as the liquid 3, using liquid having a value of ρ0.45 / σ determined from the liquid 3's density ρ(kg / m3) and the liquid's surface tension σ(N / m), the value being in a range equal to or larger than 300 and equal to or smaller than 900, and having a coefficient of kinematic viscosity ν(m2 / s) of the liquid 3 in a range equal to or larger than 1.0E-6 and equal to or smaller than 2.0E-5; and determining aperture area S(m2) of the nozzle hole 13 so that the aperture area makes a jet flow of the liquid 3 jetted from the nozzle hole 13 be divided into droplets 7.SELECTED DRAWING: Figure 1

Claims

[Claim 1] A droplet ejection device comprising a flow path for a liquid and a nozzle hole for ejecting the liquid, The density of the liquid is ρ (kg / m³). 3 ρ is determined from the surface tension σ (N / m) of the liquid. 0.45 The value of / σ is in the range of 300 to 900, and the kinematic viscosity coefficient v(m) of the liquid is 2 Use one where the value of / s is in the range of 3.0E-6 or more and 2.0E-5 or less. When the droplet injection device injects the liquid at a flow rate of Q (L / min) as the opening area S (m²) of the nozzle hole, the condition S > (-1356.5ν² + 0.09908ν) × Q is satisfied. The injection flow rate Q (L / min) of the liquid is 0.001 or more and 10 or less. The Reynolds number Re of the continuous flow of the liquid flowing through the nozzle hole is set to 2300 or less, and the number of jets Je of the liquid ejected from the nozzle hole is set to 0.1 or more and 400 or less. The diameter D (mm) of the nozzle hole is 1.09 or more and 4.30 or less. A droplet ejection device characterized in that the liquid jet ejected from the nozzle hole splits from a continuous flow into droplets.

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