화학공학소재연구정보센터
Chemical Engineering Science, Vol.206, 235-248, 2019
The effects of different jet velocities and axial misalignment on the liquid sheet of two colliding jets
This experimental study investigated the patterns and characteristics of the liquid sheet formed by two axial misaligned colliding jets and two colliding jets with different velocities. The tests were limited to the low Reynolds number region, 100 < Re < 400, of two Newtonian colliding jets (a glycerol-water mixture). This range of Reynolds number includes the triple-chain, double-chain, closed-rim, and open-rim regimes. In the case of misaligned collision, it was found that an open-rim pattern, called trigonous liquid sheet, was formed for a specific measured degree of skewness in the triple-chain, double-chain, and closed-rim regimes. In the case of colliding with different velocities, two effects were observed, including the rotation of the liquid sheet in the direction of the jets axis and the deformation of the liquid sheet. A cancer-like instability, similar to what has been observed in two identical viscoelastic colliding jets, was also captured in the central region of the liquid sheet in the case of different velocities. This instability confirmed the sheet-driven mechanism of the fishbone pattern formation. In addition, the quantitative measurement of the geometrical characteristics of the liquid sheet and the droplets size distribution of the fishbone pattern were comprehensively discussed for different Reynolds numbers, skewness factors, and velocity ratios in the cases of two misaligned jets and different velocities of the two jets. (C) 2019 Elsevier Ltd. All rights reserved.