10:20   Actuator concepts, technologies and applications Fluid Dynamics of a Confined Zero-Net-Mass-Flux Jet with Application to Assisted Dry Powder Inhalation Rina Perven, Bihai Sun, Victor J Cadarso, Julio Soria Abstract: Zero-net-mass-flux jet (ZNMFJ), has emerged as a promising actuator in fluid dynamics due to its ability to generate a jet without requiring additional mass injection [1]. This study explores the application of ZNMFJ to enhance dry powder inhaler (DPI) technology, particularly for patients with respiratory impairments. Conventional DPIs are highly dependent on strong inhalation by the patient, limiting their effectiveness for vulnerable populations such as infants, the elderly, and individuals with chronic asthma. In addition, a significant fraction of drug particles often deposit in the mouth and throat regions rather than reaching the lungs. To address these challenges, this study has investigated a novel ZNMFJ-assisted DPI device (Figure 1) by integrating the zero-net mass-flux jet into the DPI mouthpiece, consisting of a circular tube with either radial or tangential inflows close to the exit of ZNMF jet. The ZNMFJ actuator provides additional axial momentum to the mouthpiece exiting airflow, aiming to improve drug particle entrainment and targeted lung delivery. Particle image velocimetry (PIV) was employed to measure the 2-component - 2-dimensional (2C-2D) instantaneous velocity field to characterise the unsteady jet induced by the ZNMF jet at the exit of the circular tube mouthpiece. These results offer insights into how the ZNMF jet can be harnessed to manipulate airflow and particle dynamics in a medical device. This work sets the foundation for developing one of the first non-passive DPI systems with enhanced therapeutic efficiency. Velocity and Density Characterization around Ionic Thrusters in Wire-to-Airfoil Configuration Dominic Poeppe, Alina Kuhn, Jochen Kriegseis Abstract: The flow field around an ionic thruster models are investigated experimentally by means of particle image velocimetry (PIV) and schlieren imaging, supported by additional thrust information from load-cell recording and electrical measures. The investigation of density distributions builds upon the divergence determination of the PIV data and indicates the necessity to also consider density information for advanced evaluation of the thruster configurations under consideration. Both distribution and magnitude of the density variations will be discussed for a range of operation conditions and the impact of the variations on the resulting thruster performance will be outlined. Strategy and benefit of plasma-assisted control of physical phenomena in flows Nina Yurchenko, Julian Tishkoff Abstract: The developed active flow control strategy using spanwise arrays of multi-spark discharges is a highly flexible, efficient, and cost-effective approach offering inertia-free flow actuation and applicability to complex geometries without surface modification. Its development was possible due to the convergence of diverse sciences such as fluid dynamics, plasma physics, and biology that demonstrated the value of going beyond traditional disciplinary boundaries. The obtained aerodynamic performance improvements (lift growth, drag reduction, stall delay) and the potential to control other physical processes, e.g., ignition, highlight the significant engineering impact.

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