The permeating flux and annular gap pressure profile in a tubular micro-filtration membrane separator with rotary cross-flow were measured and analyzed by a self-developed on-line pressure measuring system.This test was done under different entrance pressures

different suspension liquid consistency

and different membrane separator annular gap dimensions.A comparison of the results with annular gap pressure distribution and permeation flux in membrane separator with traditional cross-flow was also made.The results showed that for rotary cross-flow the pressure value and pressure variation in the annular gap were greater

and its permeating flux was higher than traditional cross-flow by about 1.5 times. Enhancement effect of rotary cross-flow membrane micro-filtration was clear. The results can provide the experimental basis for further research on enhancement mechanism and the method of reducing or solving polarization and pollution in membrane micro-filtration.