Article
Global stability analysis of axisymmetric liquid-liquid flow focusing
Author/s | Cabezas, M. G.
Rebollo Muñoz, N. Rubio, M. Herrada Gutiérrez, Miguel Ángel Montanero, J. M. |
Department | Universidad de Sevilla. Departamento de Ingeniería Aeroespacial y Mecánica de Fluidos |
Publication Date | 2020 |
Deposit Date | 2022-09-30 |
Published in |
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Abstract | We analyse both numerically and experimentally the stability of the steady jetting tip streaming produced by focusing a liquid stream with another liquid current when they coflow through the orifice of an axisymmetric ... We analyse both numerically and experimentally the stability of the steady jetting tip streaming produced by focusing a liquid stream with another liquid current when they coflow through the orifice of an axisymmetric nozzle. We calculate the global eigenmodes characterizing the response of this configuration to small-amplitude perturbations. In this way, the critical conditions leading to the instability of the steady jetting tip streaming are determined. The unstable perturbations are classified according to their oscillatory character and to the region where they originate (convective and absolute instability). We derive and explain in terms of the velocity field a simple scaling law to predict the diameter of the emitted jet. The numerical stability limits are compared with experimental results, finding reasonable agreement. The experiments confirm the existence of the two instability mechanisms predicted by the global stability analysis |
Funding agencies | Ministerio de Economía, Industria y Competitividad (España) Junta de Extremadura Junta de Andalucía |
Project ID. | DPI2016-78887
GR18175 P18-FR-3623 |
Citation | Cabezas, M.G., Rebollo Muñoz, N., Rubio, M., Herrada Gutiérrez, M.Á. y Montanero, J.M. (2020). Global stability analysis of axisymmetric liquid-liquid flow focusing. Journal of Fluid Mechanics, 909, A10/1-22. https://doi.org/10.1017/jfm.2020.953. |
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