  Three-dimensional turbulence is usually studied experimentally by using a
spatially localized forcing at large scales (e.g. via rotating blades or
oscillating grids), often in a deterministic way. Here, we report an original
technique where the fluid is forced in volume, randomly in space and time,
using small magnetic particles remotely driven. Such a forcing generates almost
no mean flow and is closer to those of direct numerical simulations of
isotropic homogeneous turbulence. We compute the energy spectra and structure
functions using local and spatiotemporal flow velocity measurements. The energy
dissipation rate is also evaluated consistently in five different ways. Our
experimental results confirm the stationary, homogeneous and isotropic features
of such turbulence, and in particular the Tennekes' model for which the
Tennekes' constant is experimentally estimated.
