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Natural Ventilation and Climate
Published in Ulrike Passe, Francine Battaglia, Designing Spaces for Natural Ventilation, 2015
Ulrike Passe, Francine Battaglia
The second important force influencing the motion within the atmosphere is the Coriolis effect caused by the Earth’s rotation. The Earth is rotating around its axis, which stretches from the North to the South Pole. It causes the effect that an object at the equator moves at about 100 miles an hour (160 kilometers per hour) each day, while an object at the North Pole stands still. The Coriolis effect is a deflection of a moving object, when observed in a rotating reference frame. It comes into effect in the geostrophic flow, for example when air moves north from the equator and gets deflected into a counter-clockwise rotational motion, or when it moves south and is deflected in a clockwise motion. These motions can be seen in large-scale wind systems such as hurricanes. They follow a complex interaction of centrifugal forces and the forces caused by pressure gradients due to temperature (see Figure 2.11: The Coriolis effect).
A comparative study on electrocentrifuge spinning and electrospinning process as two different nanofiber creation techniques
Published in A. K. Haghi, Lionello Pogliani, Eduardo A. Castro, Devrim Balköse, Omari V. Mukbaniani, Chin Hua Chia, Applied Chemistry and Chemical Engineering, 2017
Centrifugal force is an outward force apparent in a rotating reference frame; it does not exist when measurements are made in an inertial frame of reference. All measurements of position and velocity must be made relative to some frame of reference. For example, if we are studying the motion of an object in an airliner traveling at great speed, we could calculate the motion of the object with respect to the interior of the airliner, or to the surface of the earth. An inertial frame of reference is one that is not accelerating (including rotation). The use of an inertial frame of reference, which will be the case for all elementary calculations, is often not explicitly stated but may generally be assumed unless stated otherwise.35, 36
Magneto-thermo-elastic plane waves in a rotating micropolar fiber-reinforced solid/liquid media under G–L theory for non-insulated boundary: reflection and transmission
Published in Waves in Random and Complex Media, 2022
Augustine Igwebuike Anya, Adnan Jahangir, Aftab Khan
Consequently, first-grade micro-continuum which is a material property due to deformation in terms of translational and rotational tendencies, play major role to wave propagation. It consists of microstretch, micropolar and micromorphic theories and this depends on the order to which the micro-degree is incorporated, Eringen [4]. Thus, it is to be pointed out that classical theories do not incorporate these translation and rotation of the local points in the material, hence, micropolar. All these theories are a potential concept that characterizes the behavior of materials with complex structures. In Geophysics for instance, the reflection and refraction of seismic waves gave light for researchers to investigate into the earth’s non-exterior and structures. Thus, it’s obvious that most large bodies such as moon, planets and earth possess angular velocity, and this pre-empted or necessitated the study of rotational effects, Schoenberg and Censor [5], on reflection of magneto-thermo-elastic plane waves at joint surface of micropolar fiber-reinforced/liquid media. In the rotating reference frame, the centrifugal acceleration and Coriolis effects are taken into considerations in the equation of motion.
A two-dimensional fibre-reinforced mode-I crack problem under fractional order theory of thermoelasticity
Published in Mechanics of Advanced Materials and Structures, 2020
Yongbin Ma, Zequan Liu, Tianhu He
Since the medium is rotating uniformly with an angular velocity Ω = Ωn where n is a unit vector representing the direction of the axis of rotation. The displacement equation of motion in the rotating reference frame has two additional terms: the centripetal acceleration Ω × (Ω × u) due to the time-varying motion only and the Corioli's acceleration where u is the dynamic displacement vector.