수송속도는 대부분의 입자가 유동층에 머무는 저속 유동층과 모든 입자가 수송되는 고속 유동층의 경계속도로 많이 연구되었다.
The transport speed has been studied a lot as the boundary speed between a low-speed fluidized bed in which most of the particles stay in the fluidized bed and a high-speed fluidized bed in which all particles are transported.