HEAPING PHENOMENON OF PARTICLES IN A SHAKER

According to the levels of vibrational acceleration amplitude, differe nt motion states may appear in a vibrated granular bed, including heap ing, coherent, expansion, wave and arching. The heaping phenomena of s ands or granular materials are well-known, but the internal physics is still unclear. This paper experimentally studies the heaping phenomen on in a vertical shaker. Heaping phenomenon occurs in a shaker when th e vibrational acceleration amplitude is greater than 1.2 gravitational accelerations. In addition to the vibrational acceleration amplitude, particle properties (diameter, density and repose angle) and containe r sizes (width and bed initial height) are used as controlling paramet ers to investigate the heaping phenomenon.