Steady-state shear characteristics ofAspergillus niger broths

Svihla, C. Kurt; Dronawat, Sundeep N.; Hanley, Thomas R.

doi:10.1007/bf02933439

Cited by 12 publications

(2 citation statements)

References 9 publications

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“…Figures [2][3][4] show that no experimental data were recorded at low impeller shear rates. Experimental data began aty = 8.53 S-1 for 21 % solids, 5.15 S-1 for 23% solids, and 3.43 S-1 for 25% solids.…”

Section: Limitations Of Crain Slurry Rheology Measurementmentioning

confidence: 99%

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Measurement of Rheology of Distiller’s Grain Slurries Using a Helical Impeller Viscometer

Houchin¹,

Hanley²

2004

Proceedings of the Twenty-Fifth Symposium on Biotechnology for Fuels and Chemicals Held May 4–7, 2003, in Breckenridge, CO

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Abstract2Auburn University, Office of the Provost, Auburn, AL 36849, Current research is focused on developing a process to convert the cellulose and hemicellulose in distiller's grains into fermentable sugars, increasing both ethanol yield and the amount of protein in the remaining solid product. The rheologic properties of distiller's grain slurries were determined for concentrations of 21,23, and 25%. Distiller's grain slurries are nonNewtonian, heterogeneous fluids subject to particle settling. Traditional methods of viscosity measurement, such as cone-and-plate and concentric cylinder viscometers, are not adequate for these fluids. A helical impeller viscometer was employed to measure impeller torque over a range of rotational speeds. Newtonian and non-Newtonian calibration fluids were utilized to obtain constants that relate shear stresses and shear rates to the experimental data. The Newtonian impeller constant, c, was 151; the nonNewtonian shear rate constant, k, was 10.30. Regression analysis of experimental data was utilized for comparison to power law, Herschel-Bulkley, and Casson viscosity models with regression coefficients exceeding 0.99 in all cases.

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Section: Limitations Of Crain Slurry Rheology Measurementmentioning

confidence: 99%

“…The 50s are minimal. The average shear rate constant range calculated by Rieth (3) was 10.45-10.91 for the same helical impeller. The calculated overall average shear rate constant of 10.30 falls below the range reported by Rieth (3).…”

Section: Calibrationmentioning

confidence: 99%