Datensatz

Zusammenfassung

We create a granular gas composed of table tennis balls, and study their behaviour when being shaken vertically. Using techniques of digital particle image velocimetry (DPIV), the two-dimensional velocity distribution and anisotropy of temperature is of particular interest. A high speed camera is set up and supplied with enough lighting to illuminate balls moving at the order of metres per second (ms−1). A shaker provides vertical movement and different structured ground plates are used in order to excite the particles equally in all directions. The images are processed by a routine implemented in Matlab. We find that the velocity distribution is both dependent on the structure of the ground plate and the observed position in the container.