doi.org
On the use of helium-filled soap bubbles for large-scale tomographic PIV in wind tunnel experiments
February 2015 • Fulvio Scarano, Sina Ghaemi, Giuseppe Carlo Alp Caridi, Johannes Bosbach, Uwe Dierksheide, Andrea Sciacchitano
The flow-tracing fidelity of sub-millimetre diameter helium filled soap bubbles (HFSB) for low speed aerodynamics is studied. The main interest of using HFSB in relation to micron-size droplets is the large amount of scattered light, enabling larger scale three-dimensional experiments by tomographic PIV. The assessment of aerodynamic behavior closely follows the method proposed in the early work of Kerho and Bragg (1994) who evaluated the tracers trajectories around the stagnation region at the leading edge of an …