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Flow around a sphere being visualized by seeding the flow with smoke. Visualization of hairpin vortex structure, made visible by seeding the flow with colored dye. Seeding is a fundamental technique in fluid dynamics. It is used to visualize and measure fluid flow. Researchers introduce small particles, called seed particles, into a fluid.
The early PIV setups were relatively simple and used photographic film as the image recording medium. A laser was used to illuminate particles, such as oil droplets or smoke, added to the flow, and the resulting particle motion was captured on film. The films were then developed and analyzed to obtain flow velocity information.
Flow visualization is the art of making flow patterns visible. Most fluids (air, water, etc.) are transparent , thus their flow patterns are invisible to the naked eye without methods to make them this visible.
In scientific visualization, image-based flow visualization (or visualisation) is a computer modelling technique developed by Jarke van Wijk [1] to visualize two dimensional flows of liquids such as water and air, like the wind movement of a tornado. Compared with integration techniques it has the advantage of producing a whole image at every ...
Turbulence in the tip vortex from an airplane wing passing through coloured smoke . Smoke rising from a cigarette. For the first few centimeters, the smoke is laminar. The smoke plume becomes turbulent as its Reynolds number increases with increases in flow velocity and characteristic length scale. Flow over a golf ball. (This can be best ...
The exhausting heat across the country and wildfires combine to ruin air quality
A winglet on a KC-135 Stratotanker with attached tufts showing airflow during NASA tests in 1979–80. In aeronautics, tufts are pieces of yarn or string, typically around 15 cm (6 in) long, attached to an aircraft surface in a grid pattern and imaged during flight. Their motion can be observed and recorded to locate air flow features such as ...
The smoke is moving westward from the Atlantic coast, and affected Florida more severely than Georgia. In Georgia, it stayed south of the Fall Line, a prehistoric geologic divide that traverses ...