Abstract
The entrainment or resuspension of particles in air or water is a very common phenomenon. It is determined by the fluctuating lift force that a particle, which is lying on a surface, experiences by the turbulent flow over the surface. This lift force is one of the four force components experienced by the particle which are-in addition to lift-weight, adhesion and drag force. Here we consider only very small particles that are completely embedded in the viscous sublayer of a turbulent boundary layer. For the measurement of the lift force on these particles no experimental technique was available. Therefore we have developed a new technique for measuring this lift force and its fluctuations. It is capable of measuring fluctuating lift forces of around 10-9 N. A particle is glued on top of a cantilever; a focused laser beam is used to measure the deflection of the cantilever. The experimental set-up and the measurement technique are explained and some results are shown.
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