This paper presents an approach to establish the analytical formula for the force acting on a non-magnetic disc plunged into a ferrofluid, due to the effect of a magnetic field gradient generated by the magnetic inductor of the actuator. The expression of the force acting on a magnetizable body placed in a magnetic field was used for the particular conditions imposed by the actuator configurati...

the technique used to control the airflow is based on the electro-hydrodynamic actuator which is also called plasma actuator. this actuator ensures the airflow control thanks to the electric wind created by the electrical corona discharge. this ionic wind is developed at the profile surface tangential to the initial free airflow so that it has a significant effect on the boundary layer flow. th...

A stress-induced curved polysilicon actuator with a grating is achieved for the application of recordable optical pickups, which have been realized on a single silicon chip using a two-layer poly-silicon and one-layer silicon nitride micro-machining process. Three diffracted beams with equal intensity in each order from the grating were generated while applying a voltage to the actuator. The sw...

Abstract Actuator disc and actuator line techniques are widely used for modelling wind turbines operating in farms. These essentially replace the blade geometry with applied body forces, which reduce resolved length scales significantly hence required grid resolution. This work is a verification of coupling between flow solver EllipSys3D aeroelastic tool Flex5, through quantitative comparison c...

The limit of power extraction by a device which makes use constructive interference, i.e. local blockage, is investigated theoretically. modelled using actuator disc theory in we allow the to be split into arrays and these then sub-arrays an arbitrary number times so as construct $n$ -level multi-scale original undergoes $n-1$ sub-divisions. alternative physical interpretation problem planar sy...

Efficient locomotion between prey resources at depth and oxygen at the surface is crucial for breath-hold divers to maximize time spent in the foraging layer, and thereby net energy intake rates. The body density of divers, which changes with body condition, determines the apparent weight (buoyancy) of divers, which may affect round-trip cost-of-transport (COT) between the surface and depth. We...