Turbulence and Particles in Fluids

The CloudKite

The CloudKite is a tethered 250m3 helium-filled balloon-kite combination aerostat (known as a Helikite), which is 15m long and 10m wide/high. The CloudKite provides the possibility of picking clouds of interests and performing measurements away from topographic effects. It is capable of lifting a net payload of 75kg when operating at an altitude of 1km above the sea level. The instrument box onboard the CloudKite is designed for simultaneous acquisition of cloud-microphysics and cloud/atmospheric turbulence. Every flight, the CloudKite holographic and Particle Image Velocimetry (PIV) modules will image 3 L/s of cloud for 35 min (about 6 m3 imaged in total) while acquiring air velocity, temperature, and humidity as well as particle size counting and 1D velocities for the whole 2-3 hour flight.

The CloudKite instrument box is carefully designed to maximize the overlap between probing volumes of various instruments. This makes it possible to fully resolve the coupling between cloud microphysics and turbulence. Furthermore, the low wind speed typically achieved by tethered aerostats combined with the high frame rate of our imaging instruments allows us to capture much smaller inter-frame-distances than those that possible by aircraft-borne instruments.

Field Campaigns

The CloudKite had its maiden field campaign over the Atlantic Ocean in April-May 2019 and it is planed to join the Eurec4A++ field campaign in Jan-Feb 2020.

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