Stabilizing effect of plasma discharge on bubbling fluidized granular bed*
Hu Mao-Bin†, Dang Sai-Chao, Ma Qiang, Xia Wei-Dong‡
       
Illustration of the solid volume fraction gradient ∇ ϕ , and the electric Coulomb force F E. The solid line is a guide to the eye for the border of an air bubble.