method and device for determining the wall transverse strain, or the viskositaet of fluessigkeiten models and other umstroemten koerpern.

摘要

In a method for determining skin friction or viscosity on models and other objects (4) in contact with the flowing liquid, a viscous transparent liquid is applied in a layer (8) to the surface of the object at the measurement point and the change in thickness and/or surface inclination of the layer (8) due to the flow conditions is detected with a light beam. The light beam is conveyed from the interior of the object (4) in contact with the flowing liquid in the direction of the surface (3) of the object (4) and into the viscous liquid layer (8). The reflected light beam is then collected in the interior of the object in contact with the flowing liquid and then processed further. IMAGE