Search Results for drag

... epistemic activity of physicists. For example, modeling motion and interactions in biological systems—usually water solutions with large drag forces, requires students to rethink Newton's second law, since particles move with zero average acceleration but change the direction of motion frequently. When...

... an equilibrium of two forces of gravity and air drag in an object falling with terminal velocity. The symbolic form has characteristics similar to the phenomenological primitives proposed by DiSessa (1993) in the context of conceptual learning research. Sherin's view of the blending of conceptual knowledge...

... to determine why the other hovercraft crashes by computationally modeling the motion of the hovercrafts using air drag. Similar problems have been utilized in the implementation of PBL in the context of the teaching and learning of physics [e.g., “A day in the Life of John Henry, a Traffic Cop” by Duch (2008...

..., and the drag and gravitational forces acting on the proppant particles are considered. The relationship among the velocity of an individual proppant particle, V_p, the velocity of the fluid, V, and gravitational settling, V_s, is given by Adachi...

... particles through micro-channels using a fluid medium also becomes difficult. The viscous drag force on the particles limits the terminal velocity of the moving particles given by (2.28) v lim ∝ 2 r 2 ( ρ − σ ) g 9 η ∝ L 2 As a result, v_lim scales...

... provides functional stability and a higher quality factor (Q-factor) by reducing any effect of fluid drag or other factors such as stiction and particle interference, etc. Typically, the Q-factor is limited by thermo-elastic damping and energy loss associated with the components of the accelerometer...

... and the turbine's electrical generator. The two primary aerodynamic forces at work in wind-turbine blades are lift, which acts perpendicular to the direction of wind flow, and drag, which acts parallel to the direction of wind flow. When the wind flows across the blade, the air pressure on one side of the blade...

... an acting force toward the direction of the suction side, which is represented by the lift force (F_L). This force component is perpendicular to the incoming freestream velocity. Drag force (F_D) is produced under the influence of viscous effects...

... Fig. 1.1 ). The design incorporates braided mats that are attached to the axis. The wind flow interacts with the mats and the resulting drag force rotates the rotor alongside the mats. The Persian windmills cover half of their rotor with a wall to create an asymmetric flow condition. This method...

... and BEM simulations of a research turbine considering rotational augmentation ,” J. Phys.: Conf. Ser.   1037 , 022024 ( 2018 ). Hansen , M. O. , Sørensen , N. N. , Sørensen , J. N. , and Michelsen , J. A. , “ Extraction of lift, drag and angle of attack from computed 3D viscous...

... and drag polar can be obtained. This is true for the rotating wind turbine case because only the normal force and tangential force can be directly extracted from the pressure and skin friction distributions of the blade section. Without the angle of attack, transforming these forces into lift and drag...