A new investigation of the metzner‐otto concept for anchor mixing impellers

Tanguy, P. A.; Thibault, Francis; Fuente, E. Brito de la

doi:10.1002/cjce.5450740207

Cited by 55 publications

(27 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It must be emphasized that the values of the flow index obtained are extremely low in comparison to those found in the literature, yielding to lower values of K p than expected. However, as shown by different authors for different impeller geometries (Brito-de la Fuente et al, 1992Tanguy et al, 1996;Cordobes et al, 1998), K p decrease with the flow index down to asymptotic values in the range of those experimentally found in this work (Fig. 5b).…”

Section: Power-draw Characterizationsupporting

confidence: 77%

“…Thus, different evolutions of K s with the flow index have been reported in the literature (Calderbank and Moo-Young, 1961;Beckner and Smith, 1966;Schilo, 1969;Rieger and Novak, 1973;Yap et al, 1979;Chowdhury and Tiwari, 1979;Sestak et al, 1986;Carreau et al, 1993). However, in spite of this great variety of correlations, some authors sustain that K s is almost independent of the flow index (Tanguy et al, 1996;Cordobes et al, 1998;Shekhar and Jayanti, 2003). A simple method to estimate the values of K s was that proposed by Rieger and Novak (1973), although more elaborated methods have been reported to fit K s to the flow index and geometrical factors Wang et al, 2000).…”

Section: Introductionmentioning

confidence: 95%

“…The classical dimensionless approach, based in the Couette flow analogy, followed by several authors for nonNewtonian fluids and different impeller geometries (Tanguy et al, 1996Brito-de la Fuente et al, 1997;Espinosa-Solares et al, 1997) can be applied in order to obtain the power consumption master curve for the final products. By fitting the flow curves to the power-law model (Fig.…”

Section: Power-draw Characterizationmentioning

confidence: 99%

See 2 more Smart Citations

Mixing rheometry for studying the manufacture of lubricating greases

Franco

Delgado

Valencia

et al. 2005

Chemical Engineering Science

View full text Add to dashboard Cite

Section: Power-draw Characterizationsupporting

confidence: 77%

Section: Introductionmentioning

confidence: 95%

Section: Power-draw Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

Mixing rheometry for studying the manufacture of lubricating greases

Franco

Delgado

Valencia

et al. 2005

Chemical Engineering Science

View full text Add to dashboard Cite

“…according to various authors [40][41][42]. A comparison is shown in figure 3 using the lowest estimation of shear for a 2 l STR [41], previously used for comparison against a 50 mm OBR (251 Re o 4021) [33].…”

Section: Reduced Shear Ratementioning

confidence: 99%

Biological processing in oscillatory baffled reactors: operation, advantages and potential

Harvey

et al. 2013

Interface Focus.

View full text Add to dashboard Cite

The development of efficient and commercially viable bioprocesses is essential for reducing the need for fossil-derived products. Increasingly, pharmaceuticals, fuel, health products and precursor compounds for plastics are being synthesized using bioprocessing routes as opposed to more traditional chemical technologies. Production vessels or reactors are required for synthesis of crude product before downstream processing for extraction and purification. Reactors are operated either in discrete batches or, preferably, continuously in order to reduce waste, cost and energy. This review describes the oscillatory baffled reactor (OBR), which, generally, has a niche application in performing ‘long’ processes in plug flow conditions, and so should be suitable for various bioprocesses. We report findings to suggest that OBRs could increase reaction rates for specific bioprocesses owing to low shear, good global mixing and enhanced mass transfer compared with conventional reactors. By maintaining geometrical and dynamic conditions, the technology has been proved to be easily scaled up and operated continuously, allowing laboratory-scale results to be easily transferred to industrial-sized processes. This is the first comprehensive review of bioprocessing using OBRs. The barriers facing industrial adoption of the technology are discussed alongside some suggested strategies to overcome these barriers. OBR technology could prove to be a major aid in the development of commercially viable and sustainable bioprocesses, essential for moving towards a greener future.

show abstract

“…[26][27][28] In analogy with the relationship developed for impellers, 26 a power constant can be defined for micromixers. A generalized relationship of the form K p 5 4 f/2 Re can be defined for static mixers or any kind of pipe geometry to relate the pressure drop to the Reynolds number.…”

Section: Pressure Drop For Newtonian Fluidsmentioning

confidence: 99%

Pressure drop in a split‐and‐recombine caterpillar micromixer in case of newtonian and non‐newtonian fluids

et al. 2013

View full text Add to dashboard Cite

Microreactors are very promising tools for the design of future chemical processes. For example, emulsions of very narrow size distribution are obtained at much lower energy consumption than the one spent with usual processes. Micromixers play thereby an eminent role. The goal of this study is to better understand the hydrodynamic properties of a split-and-recombine Caterpillar micromixer (CPMM) specially with regard to handling viscoelastic fluids, a topic hardly addressed so far in the context of micromixers in general, although industrial fluids like detergent, cosmetic, or food emulsions are non-Newtonian. Friction factor was measured in a CPMM for both Newtonian and non-Newtonian fluids. For Newtonian fluids, the friction factor in the laminar regime is f/2 = 24/Re. The laminar regime exists up to Reynolds numbers of 15. For shear-thinning fluids like Carbopol 940 or viscoelastic fluids like Poly Acryl Amide (PAAm) aqueous solutions, the friction factor scales identically within statistical errors up to a generalized Reynolds number of 10 and 0.01, respectively. Above that limit, there is an excess pressure drop for the viscoelastic PAAm solution. This excess pressure drop multiplies the friction factor by more than a decade over a decade of Reynolds numbers. The origin of this excess pressure drop is the high elongational flow present in the Caterpillar static mixer applied to a highly viscoelastic fluid. This result can be extended to almost all static mixers, because their flows are generally highly elongational

show abstract

A new investigation of the metzner‐otto concept for anchor mixing impellers

Cited by 55 publications

References 13 publications

Mixing rheometry for studying the manufacture of lubricating greases

Mixing rheometry for studying the manufacture of lubricating greases

Biological processing in oscillatory baffled reactors: operation, advantages and potential

Pressure drop in a split‐and‐recombine caterpillar micromixer in case of newtonian and non‐newtonian fluids

Contact Info

Product

Resources

About