Materials processing experiments under hyper-gravity in centrifuge are reviewed. It has been reported that flow can be stabilized with increase in centrifugal acceleration and that quality of grown crystals are improved. Flow can be stabilized in the following conditions; 1. when gravitational vector is normal to the solid-liquid inter-face, 2. when a gradient of acceleration exists within the container parallel to the rotating arm, or 3. when the Coriolis force exists. The effect of the Coriolis force is discussed through heat transfer experiment using a transient hot-wire technique and three-dimensional numerical modeling. Utilization of centrifuge does not directly correspond to increase in static acceleration, but different kinds of phenomena appear due to the following factors: rotation rate, length of a rotating arm, size of specimen, geometry of specimen and so on.