Development of low-cost rotational rheometer

Lasse Sørensen, Thomas Ruby Bentzen, Kristian Thaarup Skov

Research output: Contribution to journalJournal articleResearchpeer-review

1 Citation (Scopus)

Abstract

Liquids with non-Newtonian properties are presented in many engineering areas as for example in membrane bioreactors where active sludge exhibits shear thinning properties. Therefore, the ability to determine the rheology’s dependence of shear is important when optimising systems with such liquids. However, rheometers capable of determining the viscosity are often expensive and so a cheaper alternative is constructed with this exact capability. Using the principle of rotating rheometers, a low-cost rheometer was built to determine the rheology of Newtonian and non-Newtonian liquids. The general principles and assumptions behind and the physics are described. The rheometer was calibrated by comparison with measurements conducted on a Brookfield viscometer for Newtonian liquids. For validation measurements on non-Newtonian Xanthan Gum solutions were made and compared measurements on the Brookfield viscometer and with values from other sources. Furthermore, the effect of excluding the different shear rates in the system is discussed and good practice hereto is given.
Original languageEnglish
JournalWater Science and Technology
Volume71
Issue number5
Pages (from-to)685-690
Number of pages6
ISSN0273-1223
DOIs
Publication statusPublished - 2015

Fingerprint

Rheometers
liquid
Viscometers
cost
Costs
Non Newtonian liquids
Xanthan gum
Newtonian liquids
Shear thinning
Liquids
Bioreactors
rheology
Rheology
bioreactor
Shear deformation
thinning
physics
viscosity
Physics
sludge

Keywords

  • MBR
  • Non-newtonian
  • Rheology
  • Rheometer
  • Viscosity

Cite this

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title = "Development of low-cost rotational rheometer",
abstract = "Liquids with non-Newtonian properties are presented in many engineering areas as for example in membrane bioreactors where active sludge exhibits shear thinning properties. Therefore, the ability to determine the rheology’s dependence of shear is important when optimising systems with such liquids. However, rheometers capable of determining the viscosity are often expensive and so a cheaper alternative is constructed with this exact capability. Using the principle of rotating rheometers, a low-cost rheometer was built to determine the rheology of Newtonian and non-Newtonian liquids. The general principles and assumptions behind and the physics are described. The rheometer was calibrated by comparison with measurements conducted on a Brookfield viscometer for Newtonian liquids. For validation measurements on non-Newtonian Xanthan Gum solutions were made and compared measurements on the Brookfield viscometer and with values from other sources. Furthermore, the effect of excluding the different shear rates in the system is discussed and good practice hereto is given.",
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year = "2015",
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language = "English",
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journal = "Water Science and Technology",
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}

Development of low-cost rotational rheometer. / Sørensen, Lasse; Bentzen, Thomas Ruby; Skov, Kristian Thaarup.

In: Water Science and Technology, Vol. 71, No. 5, 2015, p. 685-690.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Development of low-cost rotational rheometer

AU - Sørensen, Lasse

AU - Bentzen, Thomas Ruby

AU - Skov, Kristian Thaarup

PY - 2015

Y1 - 2015

N2 - Liquids with non-Newtonian properties are presented in many engineering areas as for example in membrane bioreactors where active sludge exhibits shear thinning properties. Therefore, the ability to determine the rheology’s dependence of shear is important when optimising systems with such liquids. However, rheometers capable of determining the viscosity are often expensive and so a cheaper alternative is constructed with this exact capability. Using the principle of rotating rheometers, a low-cost rheometer was built to determine the rheology of Newtonian and non-Newtonian liquids. The general principles and assumptions behind and the physics are described. The rheometer was calibrated by comparison with measurements conducted on a Brookfield viscometer for Newtonian liquids. For validation measurements on non-Newtonian Xanthan Gum solutions were made and compared measurements on the Brookfield viscometer and with values from other sources. Furthermore, the effect of excluding the different shear rates in the system is discussed and good practice hereto is given.

AB - Liquids with non-Newtonian properties are presented in many engineering areas as for example in membrane bioreactors where active sludge exhibits shear thinning properties. Therefore, the ability to determine the rheology’s dependence of shear is important when optimising systems with such liquids. However, rheometers capable of determining the viscosity are often expensive and so a cheaper alternative is constructed with this exact capability. Using the principle of rotating rheometers, a low-cost rheometer was built to determine the rheology of Newtonian and non-Newtonian liquids. The general principles and assumptions behind and the physics are described. The rheometer was calibrated by comparison with measurements conducted on a Brookfield viscometer for Newtonian liquids. For validation measurements on non-Newtonian Xanthan Gum solutions were made and compared measurements on the Brookfield viscometer and with values from other sources. Furthermore, the effect of excluding the different shear rates in the system is discussed and good practice hereto is given.

KW - MBR

KW - Non-newtonian

KW - Rheology

KW - Rheometer

KW - Viscosity

KW - MBR

KW - Non-newtonian

KW - Rheology

KW - Rheometer

KW - Viscosity

U2 - 10.2166/wst.2014.530

DO - 10.2166/wst.2014.530

M3 - Journal article

VL - 71

SP - 685

EP - 690

JO - Water Science and Technology

JF - Water Science and Technology

SN - 0273-1223

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ER -