TY - JOUR

T1 - Determination of droplet sizes in a gas-droplet outflow from a microchannel nozzle device

AU - Gatapova, E. Ya

AU - Ryabov, M. N.

N1 - Gatapova, E.Y., Ryabov, M.N. Determination of droplet sizes in a gas-droplet outflow from a microchannel nozzle device. Thermophys. Aeromech. 32, 1241–1247 (2025). https://doi.org/10.1134/S0869864325060058 The study was supported by a grant from the Russian Science Foundation (Project No. 22-19-00581, https://www.rscf.ru/en/project/22-19-00581/).

PY - 2025/11

Y1 - 2025/11

N2 - To generate a spray flow in confined spaces, it is necessary to develop specialized nozzles capable of dispersing micron- and submicron-sized droplets at the nozzle edge. A high-speed visualization of a gas-droplet flow from a specially manufactured microchannel nozzle device with a resolution of 2.5 µm/pixel was performed, allowing for the determination of sizes of the dispersed droplets. The nozzle was a specially fabricated device composed of a 243 µm-thick microchannel silicon membrane and a microchannel size of 10 × 10 µm2. The characteristic sizes and velocities of the dispersed droplets were measured at low liquid flow rates (0.05–2 ml/min) and air pressure drops from 1 to 6 atm. At a HFE-7100 flow rate of 1 ml/min and an air pressure drop of 1 atm, the average droplet size was approximately 40 µm, while at a flow rate of 2 ml/min and a pressure drop of 2 atm, it was 20 µm. A substantial increase in velocity was observed with increasing pressure drop. At the minimum flow rate, the dispersion of very small droplets was observed, which were not detected at a resolution of 2.5 µm/pixel. However, the overall flow was clearly visible as a “mist”.

AB - To generate a spray flow in confined spaces, it is necessary to develop specialized nozzles capable of dispersing micron- and submicron-sized droplets at the nozzle edge. A high-speed visualization of a gas-droplet flow from a specially manufactured microchannel nozzle device with a resolution of 2.5 µm/pixel was performed, allowing for the determination of sizes of the dispersed droplets. The nozzle was a specially fabricated device composed of a 243 µm-thick microchannel silicon membrane and a microchannel size of 10 × 10 µm2. The characteristic sizes and velocities of the dispersed droplets were measured at low liquid flow rates (0.05–2 ml/min) and air pressure drops from 1 to 6 atm. At a HFE-7100 flow rate of 1 ml/min and an air pressure drop of 1 atm, the average droplet size was approximately 40 µm, while at a flow rate of 2 ml/min and a pressure drop of 2 atm, it was 20 µm. A substantial increase in velocity was observed with increasing pressure drop. At the minimum flow rate, the dispersion of very small droplets was observed, which were not detected at a resolution of 2.5 µm/pixel. However, the overall flow was clearly visible as a “mist”.

KW - gas-droplet flow

KW - high resolution

KW - high-speed visualization

KW - microchannel membrane

KW - microdroplets

KW - nozzle

KW - spray

UR - https://www.scopus.com/pages/publications/105042880053

UR - https://www.mendeley.com/catalogue/4c120809-0265-3e59-a233-0813e6e279cc/

U2 - 10.1134/S0869864325060058

DO - 10.1134/S0869864325060058

M3 - Article

VL - 32

SP - 1241

EP - 1247

JO - Thermophysics and Aeromechanics

JF - Thermophysics and Aeromechanics

SN - 0869-8643

IS - 6

ER -