The use of dean vortices for crossflow microfiltration: basic principles and further investigation

Simulation der Deckschichtbildung bei der Querstrommikrofiltration mit Dean-Wirbeln

“…Für eine ausführlichere Darstellung der experimentellen Ergebnisse sei an dieser Stelle auf [2] verwiesen. Der Vergleich zwischen experimentellen und theoretischen Ergebnissen gibt Auskunft über die Güte der Modellbildung.…”

“…Die flammlose Oxidation hat sich als wirksames Verbrennungsverfahren zur drastischen Absenkung der NO x -Emissionen auch bei hohen Verbrennungslufttemperaturen bei anderen Anwendungen bewährt [2,3], sie wird bislang aber noch nicht im Bereich von Reformeranlagen kommerziell eingesetzt. Bei der flammlosen Oxidation werden die für Flammen typischen Temperaturspitzen durch strömungstechnische Maûnahmen vermieden.…”

The Research of the Flow Characteristics in Spiral Membrane Separator

“…Manno, P. [15] found that the secondary flow enhanced membrane penetrated 5 times, and further energy analysis is demonstrated that for the same energy consumption, the permeate flux obtained in the coiled module was still much larger than the permeate flux in the straight module. Bubolz, M [16] indicated that the Dean vortices enhance the filtration flux and efficiency of the crossflow microfiltration process in the spiral coil film, revealing that the increased wall shear stress leads to the reduction of particle deposition and the increase of mass transfer.…”

Water production from food processing wastewaters using integrated membrane systems: A sustainable approach

“…The last approaches were developed with the full purpose of recovering several valuable compounds; furthermore, these membrane operations offer different advantages in comparison with other methodologies widely tested (decantation separation, dissolved air flotation, de-emulsification, coagulation and flocculation) (Cheryan & Rajagopalan, 1998;Castro-Muñoz, Yáñez-Fernández, & Fíla, 2016a), such as: i) high productivities in terms of permeate fluxes, ii) absence of phase transition, iii) lack of additional phase, iv) easy operating conditions and v) high selectivity towards macro and micro-solutes (Conidi et al, 2014). However, some disadvantages can also be identified, e.g., the high cost of these pressure-driven processes is represented by the membrane, as well as the energy requirement that provides the driving force (Galanakis, Castro-Muñoz, Cassano, & Conidi, 2016), whereas their performances are limited by several factors such as concentration polarization, cake layer growth and fouling (Bubolz, Wille, Langer, & Werner, 2002). Indeed, these membrane processes are part of the "Universal Recovery Process" conformed by five stages according to Galanakis (2015): a) macroscopic pre-treatment, b) separation of macro and micro-molecules, c) extraction, d) isolation-purification, and e) product formation.…”