Estimation of Effective Shear Rate for Aerated Non-Newtonian Liquids in Airlift Bioreactor”“

Shi, Lei; Riba, J. P.; Angelino, H.

doi:10.1080/00986449008940556

Cited by 47 publications

(27 citation statements)

References 15 publications

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“…Average shear rates as a function of sg were calculated from Eq. (3) using the experimental values of n and K. Details of the calculation method are given elsewhere (Al-Masry and Chetty, 1998;Shi et al, 1990). Figure 1 shows a plot of the calculated average shear rate as a function of the superficial gas velocity for both xanthan gum and CMC.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 1 shows a plot of the calculated average shear rate as a function of the superficial gas velocity for both xanthan gum and CMC. For the purpose of comparison with the work of Shi et al (1990), the estimated average shear rate plots are fitted to a second-order polynomial in a form similar to Eq. (5), and given by:…”

Section: Resultsmentioning

confidence: 99%

“…There are several methods in the literature for estimating shear rate of nonNewtonian systems based on simplified models in bioreactors. A review of the major methods is given elsewhere (Kawase and Kumagai, 1991;Shi et al, 1990).…”

Section: Introductionmentioning

confidence: 99%

“…In a later study by Henzler (1980) and Schumpe and Deckwer (1987), the constant ''c'' was found to be 1500 m −1 and 2800 m −1 , respecteively. Shi et al (1990) adopted the analogical analysis to find a cor-relation for average shear rate in an external loop airlift reactor. The reactor was 40 dm 3 in volume, 1.4 m in height, with 0.194 m and 0.064 m in diameter of riser and downcomer, respectively.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of scale-up on average shear rates for aerated non-Newtonian liquids in external loop airlift reactors

Al-Masry

1999

Biotechnol. Bioeng.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of scale-up on average shear rates for aerated non-Newtonian liquids in external loop airlift reactors

Al-Masry

1999

Biotechnol. Bioeng.

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“…The parameter x depends on n and is given graphically by Metkin and Sokolov [11] and correlated by Chisti and MooYoung [12] as: (12) Shi et al [13] evaluated the average shear rate for nonNewtonian liquids in an external loop airlift reactor by analogy with the downcomer liquid velocity of Newtonian liquids, and proposed the following quadratic equation for the shear rate: (13) for n = 0.40±0.58, K = 0.08±0.33 Pa s n , and n = 0.91±0.94, K = 0.19±0.12 Pa. s n . Rajarajan and Shamlou [14] estimated the apparent viscosity of carboxymethyl cellulose solutions (n = 0.90-0.57, K = 0.01±0.58 Pa.s n ) in an external loop airlift reactor, using the average shear rate given by:…”

Section: Wall Shear Stressmentioning

confidence: 99%

Gas Holdup in Circulating Bubble Columns with Pseudoplastic Liquids

Al-Masry¹

2001

Chem. Eng. Technol.

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The contributions of pressure drop due to wall frictional losses to the total gas holdup of two‐phase viscous non‐Newtonian systems were experimentally investigated using a 150 dm3 circulating bubble column. The column had a downcomer‐to‐riser cross‐sectional area ratio of 0.54 and a dispersion height of 2.5 m. Aqueous solutions of xanthan gum and carboxymethyl cellulose were used to simulate a wide range of rheological properties. The average wall shear stress was estimated from Al‐Masry's (1999) correlation for the average wall shear rate in external loop airlift reactors. Pressure drop due to wall shear stress was found significantly contributed by 10–70 % to the total gas holdup. This contribution has always been ignored in the data presented in the literature due to the absence of reliable and simple correlations for the average shear rate and shear stress. Corrections to gas holdup were found necessary for non‐Newtonian solutions with concentrations of ≥ 0.5 wt/wt.‐%.

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Mass Transfer

Chisti¹

2002

Kirk-Othmer Encyclopedia of Chemical Technology

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Mass transport phenomena influence all kinds of processes, often controlling the rate, the yield, the product spectrum, and product recovery. This article details the mass transfer considerations in production and processing of chemicals. Fundamentals of mass transfer are discussed for gas–liquid, liquid–liquid, and solid–liquid systems. Methods for measurement of the overall gas–liquid volumetric mass transfer coefficient ( k L a L ) are noted. Mass transport behavior is discussed for various kinds of reactors: laboratory shake flasks, vortex aerated devices, stirred tanks, bubble columns, airlift reactors, fluidized beds, packed beds, and other systems. Prediction and estimation of the various mass transfer coefficients are emphasized. Mass transfer within particles is treated as being relevant to adsorption, ion exchange, chromatographic separations, and heterogeneous catalysis. Mass transport in membrane processing is outlined.

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Estimation of Effective Shear Rate for Aerated Non-Newtonian Liquids in Airlift Bioreactor”“

Cited by 47 publications

References 15 publications

Effect of scale-up on average shear rates for aerated non-Newtonian liquids in external loop airlift reactors

Effect of scale-up on average shear rates for aerated non-Newtonian liquids in external loop airlift reactors

Gas Holdup in Circulating Bubble Columns with Pseudoplastic Liquids

Mass Transfer

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