A novel dynamic filtration device with reciprocating rotation hollow fiber membrane was used in the ultrafiltration of soybean whey. Effects of filtration modes and reciprocating rotating parameters on the permeate fluxes of membrane were investigated. A 2D particle image velocimetry (PIV) was used to capture the fluid hydrodynamics

and the energy consumption was measured for analyzing the energy efficiency. Results show that the decline of permeate flux is greatly reduced under reciprocating rotation conditions. Higher rotation speed and lower reciprocating rotation cycle increase the velocity gradient at membrane surface

specific energy consumption and membrane permeate flux. With a relatively higher angular speed of membrane fibers

the effect of reciprocating rotating cycles on membrane permeability is more significant. The membrane permeate yields can be represented by a power function of fluid velocity gradient. A polynomial function is used to describe the correlation between specific energy consumption and fluid velocity gradient. The present specific energy consumption values are larger than that of some previous researches.