Mass transfer improvement by secondary flows: Dean vortices in coiled tubular membranes

Moulin, Philippe; Rouch, Jean-Christophe; Serra, Christophe A.; Clifton, Michaël; Aptel, Philippe

doi:10.1016/0376-7388(95)00323-1

Cited by 96 publications

(52 citation statements)

References 28 publications

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“…Moulin et al, 1996;Bubolz et al, 1998;Luque et al, 1999 . Comparisons of performance under conditions of equal energy consumption or equal entrance flow rates always favor the module with secondary flows. These include systems with Ž Taylor Couette or Dean vortex flows Taylor, 1923;Dean, .…”

Section: Introductionmentioning

confidence: 97%

Viscosity effects on Dean vortex membrane microfiltration

Kluge¹,

Kalra²,

Belfort³

1999

AIChE Journal

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Section: Introductionmentioning

confidence: 97%

Viscosity effects on Dean vortex membrane microfiltration

Kluge¹,

Kalra²,

Belfort³

1999

AIChE Journal

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“…11±13 More recently, innovative membrane module design incorporating helically-wound hollow ®bre membranes 14 and coiled tubular membranes 15 have also been tested successfully in generating effective helical¯ow and secondary¯ow vortices. Evidence from high speed camera monitoring of the¯ow pattern in a glass¯ow channel with a centrally installed helical baf¯e showed the clear presence of a helical¯ow pattern as well as the appearance of secondary¯ow at a relatively low cross¯ow rate.…”

Section: Use Of Helically-wound Bafflesmentioning

confidence: 99%

Crossflow microfiltration of a primary sewage effluent-solids retention efficiency and flux enhancement

Gan

Allen

1999

J. Chem. Technol. Biotechnol.

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An experimental study was carried out to evaluate¯ux performance and solids retention ef®ciency of a ceramic membrane system in the micro®ltration (MF) of a primary municipal sewage ef¯uent. The importance of membrane pore size and MF operating conditions on the removal of suspended solids (SS) and reduction of total dissolved solids (TDS) is demonstrated. With properly de®ned membrane parameters (eg pore size) the MF process was shown as being able to produce a permeate quality better than the required EC regulatory standards concerning urban wastewater treatment for suspended and total solids reduction. The economics of the membrane process depend largely on¯ux performance which was seriously impeded by severe membrane fouling, especially inpore adsorption/deposition of particles. The critical in¯uence of membrane fouling on the¯ux reduction and change of solids retention characteristics of the membrane system was analysed. Two techniques were employed and evaluated in an endeavour to enhance permeate¯ux: (i) minimisation of surface particle accumulation by employing a helically wound baf¯e installed inside the cross¯ow channel to produce a helical¯ow pattern and vortices encompassed in secondary¯ow, and (ii) reduction of in-pore fouling by employing an automated high frequency back¯ushing programme. Finally, this paper highlights the relationship between the¯ux enhancement mechanism and increased soluble solids transmission rate at elevated ®ltration temperature and when the back¯ush technique was applied. The increased total dissolved solids concentration in the permeate has profound implications on how the back¯ush technique should be implemented.

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“…It is well known that, for instance, secondary flow may enhance mass transport [32][33][34]; these secondary vortex structures are typical phenomena in bifurcating flows [35]. Such coherent structures may also lead to separation of a mixture of scalars with different diffusivity or particles of different sizes or densities.…”

Section: Introductionmentioning

confidence: 97%