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Numerical investigations on bubble-induced jetting and shock wave focusing: application on a needle-free injection

Kyriazis, N., Koukouvinis, F. ORCID: 0000-0002-3945-3707 and Gavaises, E. ORCID: 0000-0003-0874-8534 (2019). Numerical investigations on bubble-induced jetting and shock wave focusing: application on a needle-free injection. Proeceedings of the Royal Society A, 475, 20180548.. doi: 10.1098/rspa.2018.0548


The formation of a liquid jet into air induced by the growth of a laser-generated bubble inside a needle-free device is numerically investigated by employing the compressible Navier–Stokes equations. The three co-existing phases (liquid, vapour and air) are assumed to be in thermal equilibrium. A transport equation for the gas mass fraction is solved in order to simulate the non-condensable gas. The homogeneous equilibrium model is used in order to account for the phase change process between liquid and vapour. Thermodynamic closure for all three phases is achieved by a barotropic Equation of State. Two-dimensional axisymmetric simulations are performed for a needle-free device for which experimental data are available and used for the validation of the developed model. The influence of the initial bubble pressure and the meniscus geometry on the jet velocity is examined by two different sets of studies. Based on the latter, a new meniscus design similar to shaped-charge jets is proposed, which offers a more focused and higher velocity jet compared to the conventional shape of the hemispherical gas–liquid interface. Preliminary calculations show that the developed jet can penetrate the skin and thus, such configurations can contribute towards a new needle-free design.

Publication Type: Article
Subjects: T Technology > TJ Mechanical engineering and machinery
Departments: School of Mathematics, Computer Science & Engineering > Engineering > Mechanical Engineering & Aeronautics
Date available in CRO: 21 Feb 2019 10:27
Date deposited: 21 February 2019
Date of acceptance: 7 December 2018
Date of first online publication: 2 February 2019
Text - Accepted Version
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