抄録
Flow properties of water, microbubble/water mixture, and complex fluids (anionic surfactant solution and dilute polymers solutions) were observed in the flows through porous membranes which had micron sizes pores. Pressure drops of water agreed with the predictions of Navier-Stokes equation. The resultant pressure drops of microbubble/water mixture and surfactant solution were lower than water ones in a range of Reynolds number >10^1,and so-called drag reduction effect was confirmed. In addition, much lower pressure drops compared with the water results was obtained for dilute polymer solutions. Size effect, elasticity, and electric interaction as contributing factor were discussed. Whereat, electric interaction between solid wall and microbubble (anionic surfactant micelle) was strongly suggested. Furthermore, surface tension was measured and corresponding to the discussions.
