We report results from the first systematic Lagrangian experimental investigation in the previously unexplored regime of light (air bubbles in water, and rigid hollow spheres) and large particles (D/η >> 1) in turbulence . Using a traversing camera setup and particle tracking, we study the Lagrangian acceleration statistics of ∼3 mm diameter (D) bubbles in a water tunnel with nearly homogeneous and isotropic turbulence generated by an active-grid. The Reynolds number (Reλ) is varied from 145 to 230, resulting in size ratios, D/η in the range of 7.3-12.5, where η is the Kolmogorov length scale. The experimental results are closely matched by numerical simulations of finite-size bubbles with the Faxén corrections. We also report preliminary results on light rigid spheres in turbulence.
|Publication status||Published - 1 Jan 2020|
|Event||14th European Turbulence Conference, ETC 2013 - Lyon, France|
Duration: 1 Sep 2013 → 4 Sep 2013
Conference number: 14
|Conference||14th European Turbulence Conference, ETC 2013|
|Period||1/09/13 → 4/09/13|