#science and engineering
The Smoke Angels.
Wingtip vortices shown in flare smoke left behind a C-17 Globemaster III.
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Flow galleria (#2) : Smoke from an Incense stick
In this set of images the smoke from an incense stick is seen making a transition from a smooth laminar flow (very close to the incense stick) to a turbulent flow (far away from the incense stick) while passing through the Kelvin-Helmholtz instability (rolling vortices).
** This post is part of the ‘Flow series’ by FYPhysics and EcstasyShots!. Check out the previous posts here.
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Bending light using heat: DIY Airplane edition
These images were captured from an airplane overlooking San Fransisco. But there’s something interesting going on here and something you can try the next time you are flying.
Right near the the middle of the image you should be able to notice a haze in the image. This is due to the exhaust from the engine.
Hot air is less dense than cold air.
And this creates a gradient in the refractive index of the air.
The turbulence of the air emanating from the exhaust gases also has a direct correlation to the degree of distortion of the image.
More the turbulence, more the distortion.
Although the above image is from a commercial aircraft, the effect is even more dramatic in fighter jets.
* The term that is used to describe this phenomenon is ‘Heat Haze’. You can read more about this here.
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