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Institute
Liquid pumping induced by transverse forced vibrations of an elastic beam: A lubrication approach
(2018)
Two liquid pumps are investigated theoretically and numerically: a single thin liquid layer actuated by a periodic force at an elastic beam and a two-layer geometry actuated by an elastic beam. For the second geometry, the beam actuates the liquid from both sides. For both pumps, the liquid film thickness is small compared to the lateral characteristic length of the system. A lubrication theory is developed. The Euler-Bernoulli equation for transverse deformations of an elastic beam is coupled to the fundamental hydrodynamic equations: the Navier-Stokes equation and a continuity equation in the long-wave approximation. In this way, one connects the transverse displacement of the beam with the hydrodynamic quantities (pressure, velocity fields, and flow rates). Appropriate boundary conditions incorporate the function of the valves. The derivation of the theoretical model is followed by numerical simulations. We estimate flow rates (in two and three spatial dimensions) for different system parameters and we compute the efficiency of a well-designed liquid pump.
Micromechanical element
(2015)
An overview of advances in MOEMS devices and technologies for high quality imaging systems is provided. A particular focus is laid on recent technological further developments possibly opening gateways to unprecedented device and system functionality by e. g.: increase of pixel count towards higher parallel operation, decrease of the mirror pitch in large arrays towards applications like high-performance holography, novel technologies for higher operation bandwidth, increase of aperture size for scanning applications like LIDAR, integration of high reflection coatings for processing of multi Watt laser radiation for marking and engraving, and phased arrays for high speed laser beam steering.