Permeate flux enhancement by pressure and flow pulsations in microfiltration with mineral membranes

Mechanisms by which pulsatile flow affects cross‐flow microfiltration

“…Many successful examples have been reported over the last ten years (Bertram et al, 1993;Ding et al, 1991Ding et al, , 1993Gupta et al, 1986Gupta et al, , 1992Jaffrin, 1989;Jaffrin et al, 1987Jaffrin et al, , 1989Jaffrin et al, , 1992Jaffrin et al, , 1994Sparks, 1991, 1992;Wenten et al, 1994).…”

“…In a detailed comparison of the filtrate flux and pressure waveforms and pressure wave, Gupta et al (1992) reported that flux enhancement with a pressure wave involving a short-duration (relative to cycle length) minimum followed by a short-duration maximum was higher than when the maximum preceded the minimum. They postulated that, after a stable pressure period during which a cake was formed, a low-pressure peak caused destabilization of the cake layer.…”

Intensification of membrane microfiltration using oscillatory motion

“…These include the use of turbulence promoters [4,5], periodic back flush [6,7], generation of Taylor and Dean Vortices [8][9][10], and application of oscillatory motion which has proven effective in enhancing heat and mass transfer rates at solid-liquid interface [11][12][13][14][15][16][17][18]. The high shear created by the periodic relative motion between the surface and the feed stream, has the advantage of decoupling the system throughput from the shear rate, thus, filtrations can be carried out at low velocity while still maintaining high surface shear rate by controlling the oscillation intensity.…”

Effect of varying incidental angles of a wire-rod insert on the performance of tubular ultrafiltration membranes

“…Several hydraulic approaches developed for reducing the effects of concentration polarization (CP) and progressive fouling to enhance the permeate flux, have been thoroughly discussed [7][8][9][10][11][12][13][14][15][16][17][18][19]. The use of inserts such as metal grills [7], static rods [8], spiral wire [9], disc-and doughnut-shaped inserts [10] and helical baffles [11][12][13][14], in a tubular membrane have been tried on different membrane processes. Da Costa et al performed an extensive study of UF flux by net-type spacers [15][16][17].…”