There are three methods for the prevention of swirling and vortex formation : (i) Off-centre mounting of the impeller. (ii) Use of baffles. (iii) Use of diffuser ring with turbines.
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These so-called “von Kármán vortices” arise when winds are diverted around a blunt, high-profile area, often an island rising from the ocean. The alternating direction of rotation in the air forms swirls in the clouds. Satellites regularly spot these wind and cloud patterns around the world.
1. a whirling mass or rotary motion in a liquid, gas, flame, etc, such as the spiralling movement of water around a whirlpool. 2. any activity, situation, or way of life regarded as irresistibly engulfing.
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In The Year of Magical Thinking, Joan Didion’s memoir about the death of her husband and her daughter’s sudden sickness, Didion describes being paralyzed by memories of her family triggered during mundane circumstances. She calls this experience “the vortex effect.”
The Strouhal number is defined as St = fstD/U, where fst is the vortex shedding frequency (or the Strouhal frequency) of a body at rest, D is the diameter of the circular cylinder and U is the velocity of the ambient flow.
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In fluid dynamics, a Kármán vortex street (or a von Kármán vortex street) is a repeating pattern of swirling vortices, caused by a process known as vortex shedding, which is responsible for the unsteady separation of flow of a fluid around blunt bodies.
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Vortex flow meters measure fluid velocity using a principle of operation referred to as the von Kármán effect, which states that when flow passes by a bluff body, a repeating pattern of swirling vortices is generated.
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The Strouhal Number is a dimensionless value useful for analyzing oscillating unsteady fluid flow dynamics problems. It is used in Karman vortex trial phenomenon. For a circular section cylinder, this number remains, in a wide range of Reynolds, approximately constant and equal to 0.2.
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The Strouhal Number can be important when analyzing unsteady, oscillating flow problems. The Strouhal Number represents a measure of the ratio of the inertial forces due to the unsteadiness of the flow or local acceleration to the inertial forces due to changes in velocity from one point to an other in the flow field.
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A bluff body can be defined as a body that, as a result of its shape, has separated flow over a substantial part of its surface. An important feature of a bluff body flow is that there is a very strong interaction between the viscous and inviscid regions.
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Fluid mixing can be described as the incorporation of one immiscible liquid into another immiscible liquid. For instance while making emulsions (water in oil or oil in water). Fluid mixing can also imply the incorporation of gas into a liquid phase.
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Vortex formation in a stirred-tank improves the sinkability of powders in liquids and consequently allows the mixing of powders in liquids to form higher solids content dispersions and solutions.
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Generally, agitation refers to forcing a fluid by mechanical means to flow in a circulatory or other pattern inside a vessel. Mixing usually implies the taking of two or more separate phases, such as a fluid and a powdered solid or two fluids, and causing them to be randomly distributed through one another.
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Vortices often form as a result of a difference in fluid speed ” like when fast wind moves over slow wind. This is what happens when you drag the plate through the water ” the water right next to the plate moves quickly because of friction, but the water further away from the plate is stationary.
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Paddle Mixers A tangential flow pattern predominates with zones of turbulence to the rear of the blades. The gate paddle (Fig. 13.7B) is suitable for mixing liquids of higher viscosity, and the anchor paddle (Fig. 13.7D), with low clearance between pan and blade, is useful for working across a heat transfer surface.
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Irrotational vortices In the absence of external forces, a vortex usually evolves fairly quickly toward the irrotational flow pattern, where the flow velocity u is inversely proportional to the distance r. Irrotational vortices are also called free vortices.
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Generally speaking, a vortex is an area in a fluid (air or water) where the flow spins around an axis line and can take a straight or curved shape. It is basically formed when a fluid is stirred or spun. This natural phenomenon can take place on land, air, and water.
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Simplified wing vortex system. A double trail of vortices formed alternately on both sides of a cylinder or a similar body moving at right angles to its axis through a fluid, with the vortices in one row rotating in a direction opposite to that of the other row.
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An international team of astronomers has proved the existence of a ‘gravitational vortex’ around a black hole, solving a mystery that has eluded astronomers for more than 30 years. The discovery will allow astronomers to map the behaviour of matter very close to black holes.
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They produce a hot and a cold air flow. The cold air flow volume will be the majority of those two flows in most cases. So you could say you get more from a vortex tube in terms of energy output when it is used as a cooling device than as one for heating.
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Sedona vortexes (the proper grammatical form ‘vortices’ is rarely used) are thought to be swirling centers of energy that are conducive to healing, meditation and self-exploration. These are places where the earth seems especially alive with energy.
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A forced vortex, on the other hand, is caused by external forces on the fluid. It can be created by rotating a vessel containing fluid or by paddling in fluid. Rotational flow created by impellers of a pump is an example of a forced vortex in turbomachinery.
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Most people consider the Boynton Canyon vortex site to be the most powerful Sedona vortex overall. The Boynton Canyon mixes both masculine and feminine energies.
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The Strouhal number of a stationary tube or circular cylinder is a function of Reynolds number but less of surface roughness and freestream turbulence, see Figure 2.
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The acceleration of an element of fluid, given by the convective derivative of the velocity , where. is the gradient operator.
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The Euler Number is a dimensionless value used for analyzing fluid flow dynamics problems where the pressure difference between two points is important. The Euler Number can be interpreted as a measure of the ratio of the pressure forces to the inertial forces.
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Helical strakes are effective when they break up the correlation of vortices along a tubular and produce random alternating forces along the tubular length.
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Named after Theodore von Kármán, a co-founder of NASA’s Jet Propulsion Laboratory and one of the first scientists to describe this type of atmospheric phenomenon, these beautiful cloud formations typically occur when the prevailing wind is diverted by elevated land features such as islands, mountaintops, or volcanoes.
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According to photographs presented elsewhere,15,16 a regular Karman vortex street in the wake of a cylinder is observed only in the range of Reynolds numbers from about 60 to 5000. At lower Reynolds numbers, the wake is laminar, and at higher Reynolds numbers, there is a complete turbulent mixing.
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Vortex flowmeters are used in numerous branches of industry to measure the volume flow of liquids, gases and steam.
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This meter offers a 1.25% of rate accuracy when measuring the mass flow of liquids and a 2% of rate accuracy for gases and steam.
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In dimensional analysis, the Strouhal number (St, or sometimes Sr to avoid the conflict with the Stanton number) is a dimensionless number describing oscillating flow mechanisms.