Effect of rheological parameters on non-ideal flows in the continuous-flow mixing of biopolymer solutions

Patel, Dineshkumar; Ein‐Mozaffari, Farhad; Mehrvar, Mehrab

doi:10.1016/j.cherd.2015.05.010

Cited by 23 publications

(5 citation statements)

References 38 publications

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“…The calculated Po agreed well with experimental values and the extent of non-ideal flow decreased with increased N, and decreased feed flow rate, τy values and Xanthan gum concentration. In a similar study, Patel et al (2015) used CFD to study the effect of rheological properties on the extent of non-ideal flow in viscoplastic fluids agitated with a 6-bladed RT impeller (D/T = 0.47) in a continuous flow reactor, and determined the mixing effectiveness increased with decreased K, decreased n, and decreased τy values. In a series of studies, Pakzad et al (2008aPakzad et al ( , 2008bPakzad et al ( , 2008c used UDV, ERT and CFD techniques to evaluate the flow fields in Xanthan gum solutions that result through agitation with a 6-bladed Scaba 6SRGT radial flow impeller (D/T = 0.45).…”

Section: = +̇mentioning

confidence: 99%

Mixing viscoplastic fluids in stirred vessels over multiple scales: A combined experimental and CFD approach

Russell

Kahouadji

Mirpuri

et al. 2019

Chemical Engineering Science

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Dye visualisation techniques and CFD are used to characterise the flow of viscoplastic Carbopol TM solutions in stirred vessel systems over multiple scales. Centrally-mounted, geometricallysimilar Rushton turbine (RT) impellers are used to agitate various Carbopol 980 (C980) fluids. The dimensionless cavern diameters, Dc/D, are scaled against a combination of dimensionless parameters: Rem-0.3 Rey 0.6 n-0.1 ks-1 , where Rem, Rey, n and ks are the modified power-law Reynolds number, yield stress Reynolds number, flow behaviour index and impeller geometry constant, respectively. Excellent collapse of the data is demonstrated for the fluids and flows investigated. Additional data are collected using a pitched-blade turbine (PBT) with cavern size similarity being shown between the RT and PBT datasets. These results are important in the context of scale-up/scale-down mixing processes in stirred vessels containing complex fluids and can be used to show that flow similarity can be achieved in these systems if the processes are scaled appropriately.

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Section: = +̇mentioning

confidence: 99%

Mixing viscoplastic fluids in stirred vessels over multiple scales: A combined experimental and CFD approach

Russell

Kahouadji

Mirpuri

et al. 2019

Chemical Engineering Science

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“…As an example may be mentioned: Crude oil-polymer emulsions, 19 D-limonene/water emulsions prepared with Angum gum, 20 gellan gum fluid gel, 11 or xanthan gum solutions. 21 The flow curves were successfully fitted to the Herschel-Bulkley equation (R 2 > 0.999) in order to identify the flow responses of the emulsion:…”

Section: Rheological Measurementsmentioning

confidence: 99%

Development, rheological properties, and physical stability of d‐limonene‐in‐water emulsions formulated with copolymers as emulsifiers

Trujillo-Cayado

Garcı́a

Muñoz

et al. 2016

J of Applied Polymer Sci

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This contribution reports the development of 30 wt % D-limonene-in-water emulsions formulated with a biopolymer (gellan gum) as stabilizer and prepared with a high-pressure homogenizer. The role as emulsifiers of different ratios of amphiphilic copolymers (Atlas TM G5000 and Atlox TM 4913) was assessed. The results indicated that the ratio of emulsifiers had significant effect on the physical stability, droplet size, viscoelasticity, and viscosity of these emulsions. The mean droplet diameters decreased as Atlas TM G5000 concentration increased from 1 wt % to 3 wt %. The aging of emulsions resulted in an increase in the size of droplets for the emulsions containing high Atlox TM 4913 copolymer content. An increase of Atlas TM G5000 enhanced both the G 0 and G 00 values and the viscosity providing higher stability to emulsions. Gellan gum caused in viscoelastic moduli weaker frequency dependence at the lower frequencies, according to the formation of a faint gel-like matrix. All emulsions exhibited shear thinning flow properties that fitted the power-law equation.

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“…A number of studies can be found in the literature concerning these topics (see, for instance, Kazemzadeh et al, 2016, Patel et al, 2015, Stobiac et al, 2014, Pakzad et al, 2013b. These overall parameters, however, do not reveal details of the fluid dynamics and mixing patterns within the mixers, which can only be obtained with detailed flow field measurements.…”

Section: Introductionmentioning

confidence: 99%

Computational fluid dynamic studies of mixers for highly viscous shear thinning fluids and PIV validation

Cortada-García

Weheliye

Dore

et al. 2018

Chemical Engineering Science

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Often, impellers almost as large as the tanks containing them and impeller blades equipped with holes are adopted in industry. In this work, we studied experimentally the main features of the flow generated by this type of impellers for a mixture of glycerol with a carbomeric gel by means of particle image velocimetry. The experiments were conducted at temperatures ranging from 40 to 60°C and impeller speeds ranging from 40 to 140 rpm. In all cases, the flow regime was laminar or in the transition region. We also used computational fluid dynamics simulations to describe the behaviour of the mixer, validating the results experimentally with good agreement. We used the numerical results to obtain information on the performance of the mixer, determining the locations and size of vigorous agitation zones and the local effect of the holes present on the impeller blades. The power curves of the mixer were obtained, and the mixer efficiency in terms of power consumption was found to be similar to other impellers used to mix highly viscous non-Newtonian fluids.

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Effect of rheological parameters on non-ideal flows in the continuous-flow mixing of biopolymer solutions

Cited by 23 publications

References 38 publications

Mixing viscoplastic fluids in stirred vessels over multiple scales: A combined experimental and CFD approach

Mixing viscoplastic fluids in stirred vessels over multiple scales: A combined experimental and CFD approach

Development, rheological properties, and physical stability of d‐limonene‐in‐water emulsions formulated with copolymers as emulsifiers

Computational fluid dynamic studies of mixers for highly viscous shear thinning fluids and PIV validation

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