A brief analysis of possible hydraulic techniques for

A brief analysis of possible hydraulic techniques for fouling and thermal polarization CID 2011756 in MD.TechniquePotential benefitsPotential challengesSelected referencesInduction of secondary flowNo extra equipment required, easy to adopt, strong effect on temperature polarization on up and down stream sides, high shear acting on the surface can remove the attached particles and fouling layer built up, the performance can be tuned simply by changing the coil diameter and pitch.Although for heat exchangers and low pressure membrane processes, the process has been well studied yet further studies are required to establish the effects for MD[14], [15], [16] and [17]Pulsating and intermittent flowsReduction in concentration and thermal polarization, relatively simple to incorporateAdditional operational and capital cost associated with the flow patterns generating equipment[18], [19] and [20]Air spargingReduction in fouling and thermal polarizationAdditional cost related with air sparging equipment, air can occupy the part of membrane modules thus reducing the contacting area, the pores can be occupied by the injected air leading towards reduced vapor pressure[21] and [22]BackwashingRemoval of crystals, scales and deposits partially covering the poresThe pore wetting will occur leading to the post drying requirement, the effectiveness of the technique will be limited to remove deposition, scaling occurred within the pore or at pore mouth, no effect on thermal polarization[23] and [24]Rotating membranesReduction in concentration and thermal polarizationHigh energy consumption, design modification for MD can be complicated, may not be suitable for hollow fibers[25] and [26]Full-size tableTable optionsView in workspaceDownload as CSV